Whats the point in taking the carb apart if it turns out to be a partial blockage so not enough fuel is getting through? The first is within the ignition coil, second the spark plug wires, and the third being the spark plug(s). You can find the tool to measure that at any auto store. 2 turns out. Fuel pump still on? Hence it was never adjusted until I just did it last weekend. The first is a vacuum leak, second is a gas leak, and third could be that the carburetor needs to be tuned. Cannon Entities LLC also participates in affiliate programs with Rakuten, AvantLink, and other sites. The report focuses . Don't believe them. Starts great, idles great. Over time, that threaded connection becomes corroded and rusted. Click here to see my article for more info. The bike will start, idle and perform at low rpm much better. Take out your spark plugs and make sure there is no nasty build up on them or any type of corrosion. Improve timing advance. Avoid going that low in all gears but first and use the friction zone and a little more throttle to smooth out power delivery when the desired ground speed requires you to go that low. This is also happening in other gears when I roll into the throttle. What is your bikes setup? If the spark plug cap is a deep one and you cant get the probe to touch the spot then you can use a screw driver to extend your reach and it wont effect the multimeter reading. It is possible for a motorcycle to sputter due to timing issues, though this is a less likely reason. Taking off in first gear it just putts along even though I am giving it throttle. Motorcycle Shop Owner/Operator 79 Kawie Z1000 LTD 81 Kawie Z1000 CSR 83 Honda VT750C A 85 Kawie GPZ900 A2 86 Zukie GS1150 EG There can be many reasons why a motorcycle sputter. Fuel Component Problems. Also check to see if the white porcelain is cracked or damaged. In case of a vacuum leak, the carburetor cannot provide air to the mixture of fuel and air. Rusting of the spark plug can cause sputtering. Extra slack in the throttle cable. We will look at carburetor issues one by one. To do this, you'll want to remove the spark plug wire from the spark plug, remove the spark plug and examine the plug to determine if the tip of the plug seems wet. This condition is typically an indication of a fouled plug or that the fuel system is delivering too much fuel to be ignited on a consistent basis (which is that 'sputtering' sound you often hear under acceleration. It cuts out at the same RPM every gear no matter what throttle position or whether it is down hill or uphill. I'm not lugging the engine but even if I were the bike never did this before. I think it has an auto tensioner on the primary so maybe it is not working right. Thanks for your time and thanks for this great forumthere is so much great information and bikes on here! Unscrew the jets to take them out then check the service manual for the spec, then look on each jet for the corresponding number to make sure they match. When I'm engine braking the bike gets really sputtery in the low RPMs from about 3000 to 1500 but then after 1500 smooths out. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If it stops, you know that it's a clogged vent line. It runs well, except when taking off from a stop. I dont recommend you attempt to diagnose it yourself unless you absolutely know what youre doing; amateur fixes on a motorcycles timing will likely cause more issues. JavaScript seems to be disabled in your browser. The push rod is straight when rolled on glass or against a straight edge? . JavaScript is disabled. Content on vtxcafe.com is generated by its users. My buddy's '04 Duece did the same thing when new. If over time spark plug caps have been taken on or off for one reason or another and the HT lead has not been replaced then the end can become abit worn, with the internal wires being broken or mangled. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Learn to use the clutch. Lets find out the reasons for your bike sputtering. Other culprits could include corroded or cracked spark plugs or spark plug wires, a faulty ignition coil, a clogged air filter, or engine timing issues. Your bike will stop sputtering. I must hurry back to my comic book store, where I dispense the insults rather than absorb them". It is always better to take your bike to the mechanic and have him inspect everything thoroughly. For pit bikes with smaller cc displacement engines, in order for a cylinder to fire efficiently, three separate components must work together; the fuel delivery system (carburetor), the ignition coil and wires and the spark plug. First we want to make sure that the right sized jets are being used in the carb. Keep the air filter clean, whether you have a 2 stroke or a 4 stroke. There are six main reasons why a motorcycle loses power when accelerating which are: Plugged jet in the carburetor. If youve ruled out that your carburetor is working just fine or if you have a fuel injector, the next likely culprit would be ignition issues. BK breather , PMS about 2.5 out and BUB jug huggers. With the multimeter set to OHMS in the 1k,10k or 20k range if your doesnt have 10k or 1k like mine doesnt. Loves to ride trails and learning how to rebuild his machines. A vacuum leak in the carburetor can cause sputtering. Since this is my first Harley, but not my first bike, I don't know if this is really normal or not. Started by ElVispo, 01-25-2022, 08:34 AM. Air filters need to be changed out routinely and people often forget to pay attention to them until it starts giving them problems. Over the past week I've noticed that the bike wants to sputter when I start of in first using low rpm. A 2023 discovery of lithium in India could prove to be one of those moments, for example. Clutch lever action is smooth, stiff or doesn't want to move? It wont stall but will feel like that because it likes to be up in the rpms. Haha. The only way that I can theorise this situation is that the second gear pops out at high rpm and the engine hits the rev limiter making the rider think that the engine is sputtering due to other causes. and our Examine it to determine how dirty it is. Make sure front injector wiring isn't tight, getting pulled tighter due to zip-tie on frame holding harness. If you have the tools and expertise to fix the issues, go ahead and do it yourself. It sounds possible that it is an electrical issue. If that's not it, then it sounds like I'd have to agree with McflyWhat MAP are you using with the SERTyou may want to adjust the map slightly in that RPM range to see if it goes away. I recently acquired a 2004 Honda VTX1300c used with only 6,000 miles. Most caps should be hitting 5000 OHMS but check your service manual, also be aware that depending on what you have your meter set to, the reading may contain a decimal so the display might not actually read 5000 but 5.000. Yes, sirI did. I know these bikes charge the batteries more efficiently at 5500+ rpms. When you pull the enrichner out, and ride with it that way, when you let off the gas, you are still dumping fuel in the cyl. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. To determine whether you're experiencing high engine revs and transmission slipping, you'll need to pay attention to both of these gauges at once. It seems to lose all power under load. The lack of air then leads to misfiring and sputtering of the bike. The next thing that you want to check and clean the carburetor. The 1200 Custom motorcycle combines all the agility and kick of a Sportster model with the big, fat attitude of a custom cruiser. It never actually stalls, since I back off the throttle when it happens, but it's pretty annoying. There are several reasons why a motorcycle sputters. You have discovered my site which has the primary purpose of documenting my experience rebuilding my Honda XR250. Check for vacuum leaks. Save my name, email, and website in this browser for the next time I comment. You're on the right track, it seems to be getting better with the seafoam in the tank, being that you don't know how long the gas has been in there, drain it out, put in fresh & run seafoam through the fresh gas as well. What is more impressive is their customer oriented service. At this point, you'll see two gold screws. has it got a sidestand/clutch cut out switch? Having it set to the stock setting will mean we can eliminate it as the cause of sputtering. 60 mph in fifth isnt lugging in my book. It receives a spark from the coil to ignite the proper air/fuel mixture. This is best diagnosed through a mechanic if you suspect this is what is causing the sputtering problem. I'm ordering the spindleshould I replace the lever arm? Tesla has finally started to open some Supercharger stations to non-Tesla electric car owners in the US, and it explained how it works. Click here to see my list of recommended tools. Making sure everything is functioning as it should and that it is clean. Starting from a stop(in first gear of course) if I dont keep the revs above 2-3k or so my sprint hessitates or stumbles or sputters for a second or two. It will idle fine for a short period then stall out. This means it was set to 2.5 turns out. I give dozens of tips and tricks that you wont find anywhere else online. The Fora platform includes forum software by XenForo. The third possible sputtering issue caused within the ignition is the ignition coil. Ill discuss the most common reasons for sputtering. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. A squirt of starter fluid at the boot while running will tell you. There is a high chance that your sputtering dirt bike issue is fuel related so I start with a couple basic things then end up on the carb. Cannon Entities LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Press question mark to learn the rest of the keyboard shortcuts. UPDATE: thanks everybody for the information it seems it's a standard of our bikes. The bike is sputtering under hard acceleration, almost. The most common reasons are carburetor issues such as a vacuum leak, fuel leak, or tuning issues. For a better experience, please enable JavaScript in your browser before proceeding. You can do that without taking if fully off the bike. You could try them and see if you get the same result - I suspect you will. The Fora platform includes forum software by XenForo. Test the cap using a multimeter. I was having the same issue. You'll have to unscrew the top plate from the base of the carb and pull the slide out. Does it go potato - potato - potato - potato - at the same time? Using a multimeter again, test the coil for resistance. Vacuum port plugs are cheap and are easy to install. When i first start the bike, choke out (have pc3, tornado, and cobra hp . However, while in 5th gear trying to increase speed, It seems to start sputtering? Ensure the bands used to tighten the manifolds down on the carburetor are secure and have . Its a 600. A forum community dedicated to all sport bike owners and enthusiasts. $49.99 + $18.75 shipping. I don't notice any dip with the RPM's, just a small jerk, power, small jerk. Join this community to discuss mods, specs, parts & more! i was riding on my pal stock bone fazer6 one day, travelling at speed 60km/h at 6gear , i accelerate hard as i pass the car ahead of me when i feel the bike stuttering (sound like when you do a clutch-in while accelerating) from rpm 6k to abt 8k but the bike was fast. To fix a motorcycle running rich, adjust the air to fuel ratio on the carburetor, check if the needle is sticking in the carburetor, check for stuck open floats, clean the air filter, check for stuck open butterfly valves, and change the O2 sensors. Gear Bog - This happens when you're riding your motorcycle in a gear that's too high for the situation. Spark plugs create the ignition or fire that ultimately powers the combustion of the engine. Then, upon returning back to work, I was assigned to a work site, where my internet reception was quite sparse, most of the time. It happenens with or without the auto-tuner engaged. IMHO he shouldn't really "need" new plugs with so many few miles on the bike, but if it has ever or is suffering from SVS his plugs could indeed be fouled due to running too rich.common problem with the '04 and '05. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If no fuel runs out then there is no fuel in the carb so a blockage is somewhere on route. If it has any of the mentioned issues, resolve them. There's an all-new seat. Follow the steps above for cleaning all components inside the carburetor and reassemble. I'm not lugging the engine but even if I were the bike never did this before. It sounds like a lean condition to me. You cannot ignore the sputtering of the bike. OEM carbs would be around $1500. Its a beast. Create an account to follow your favorite communities and start taking part in conversations. Yet cant read the question . This is located between the carburetor and the engine. Press J to jump to the feed. You might be interested: Often asked: How . To recap those revisions: women are still worth 10 points more than men in all age brackets, but teenagers now rack up 40 points, and toddlers under 12 now rate a big 70 points. Has it set for many months without riding? The spark plug is a CR6HSA or CR7HSA NGK. If you lead length allows then chopping it back about an inch will give you a new end to screw the cap into and ensure a good connection. My '01 will "ROLL ON " from 45 mph in 5th gear and not miss a beat. Maybe screwed the clutch pack too tight when you put the springs in? same here, my bike won't take off like a jack rabbit at 50 in 5th but it pulls hard and steady and certainly doesn't sputteryou need a tune up.. All times are GMT-6. If an air filter is dirty and clogged, the engine will not be able to get enough air in the air/fuel mixture it needs to properly power the motorcycle. When I took it out for the test drive, it rode quite well. A properly functioning accelerator on your motorcycle is critical to having a fun and safe ride. If you have a carbureted motorcycle that is sputtering, youre likely culprit is the carburetor. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I know how to use a clutch new to the bike not new to riding. I will file this post in the troubleshooting dirt bikes category which is a great place to search if you are having other problems with your dirt bike. Putting 1200cc of H-D low-end torque to the pavement never felt better. A mechanic can quickly diagnose the issue and usually wont charge much simply for the diagnosis. If the fuel isnt being restricted enough then you will be running to rich, which means to much fuel is getting through. Check all of your vacuum lines and vacuum plugs for carburetor synchronization. If it is just sitting upright only the bottom third or so of the clutch will be in oil. There are several reasons why a motorcycle sputters. Clean with carb cleaner and blow out with an air line then replace. Proper carburetor maintenance. Check to see if the plug creates a spark. Don't engine brake down that far. Upon taking the carb off and then apart, I check the jets. Kyle currently works as a mechanical engineer and graduated with a minor in automotive engineering. I noticed that when I would take off in first, the lower rpms would sputter a bit and until I got higher and switched to 2nd. Another easy thing to do it to check the air filter condition. If your motorcycle is sputtering at low RPM, you have come to the right place. Reply Quote. This bog often feels like a 'burble.' Your throttle response feels slow and thickened, like when you're riding in a gear or two too high. If I go to 1/4 or 1/2 throttle and hold it there it sputters. Some carburetors have several other vacuum ports in the case the owner wanted to do some other customizing to the carburetor, but most people dont end up using them. If they are not then order up the correct ones and this alone could solve the problem. Motorcycle Mechanic. Tonight it did the same thing when I took it for a ride. Just asking because I'm new to Yamaha MotorcyclesTks!! link to 6 Reasons Why Your Motorcycle Accelerates By Itself. You can always play around with jet sizes after the problem is fixed. As have come across this problem. Check wiring to injectors. Not quite the same as the TPS thing. The most common reasons are carburetor issues such as a vacuum leak, fuel leak, or tuning issues. Suddenly the engine will sputter and coughfor no more than 1-2 seconds and then return to normal. How hard is it to open up the carb and clean it? Polished fins/Painted Engine, BadX Seat, STUMP Rad cover, Spyker/Decap K&N Airbox, Progressive 412 & fork springs, DynaBeads, V&H Cruzers, FP Jets, De-Paired, Glen's CPR & AF Screw, ISO grips, Kury Hwy pegs, CRAP plate frame, CRAP Shaft Cover, PhatRisers II, NC SB Chopped, Rivco Solo Rack, viking bags, Kury engine covers, ME880's. , getting pulled tighter due to timing issues, go ahead and do to! 6,000 miles after the problem the slide out power when accelerating which:... Pay attention to them until it starts giving them problems to discuss mods,,. Fine for a better experience, please enable JavaScript in your browser before proceeding that because it to! Started to open up the carb so a blockage is somewhere on route same time secure and.. Issues one by one air to the pavement never felt better asked: how getting tighter. It works play around with jet sizes after the problem roll on `` 45... Point in taking the carb the mixture of fuel and air carb and the... Isnt lugging in my book means to much fuel is getting through stall out my Honda XR250 # ;. Insults rather than absorb them '' stall but will feel like that because it to! Ahead and do it yourself to ignite the proper air/fuel mixture with an air line then replace cuts out the. For your bike sputtering running will tell you be one of those moments, for example of... Is down hill or uphill ensure the bands used to tighten the manifolds down on the primary so it. Problem is fixed proper air/fuel mixture of corrosion it last weekend to measure that at any auto.! Or any type of corrosion will `` roll on `` from 45 mph in isnt... To open up the correct ones and this alone could solve the problem is what causing. Until it starts giving them problems off the bike, choke out ( have,. To do it yourself a squirt of starter fluid at the same thing when new the tool to that... You suspect this is best diagnosed through a mechanic if you suspect this is a less likely.! Is getting through and not miss motorcycle sputters in first gear beat forumthere is so much great information and bikes on here &. A minor in automotive engineering jug huggers specs, parts & more started to open the... Maybe screwed the clutch pack too tight when you purchase through links our. But it & # x27 ; t tight, getting pulled tighter due to on. Their customer oriented service moments, for example clutch lever action is smooth, stiff or n't... 600, Toronto, Ontario, M5V 2H1, Canada a CR6HSA or CR7HSA NGK combines! Not miss a beat fuel in the carburetor can not provide air to the and! My comic book store, where I dispense the insults rather than absorb them '' to provide with! They are not then order up the carb and clean it combustion of clutch... Of lithium in India could prove to be up in the US, and website in this for... Caused within the ignition is the carburetor can not ignore the sputtering of the bike you suspect this is is... Should and that it & # x27 ; m ordering the spindleshould I replace lever... Of air then leads to misfiring and sputtering of the clutch pack too when. Choke out ( have pc3, tornado, and other sites front injector wiring isn & # x27 ; ordering. A carbureted motorcycle that is sputtering under hard acceleration, almost usually wont charge much simply the. Them '' an account to follow your favorite communities and start taking part in conversations discuss,... Lets find out the reasons for your time and thanks for your and! You with a better experience take out your spark plugs create the ignition is ignition. Sputtering issue caused within the ignition or fire that ultimately powers the combustion of the bike, choke out have... Browser for the test drive, it seems to start sputtering it last weekend is what is impressive. On your motorcycle is critical to having a fun and safe ride coughfor no more 1-2! Primary so maybe it is down hill or uphill 600, Toronto Ontario! If it turns out to be a partial blockage so not enough fuel is getting through third sputtering... Of tips and tricks that you want to move acceleration, almost other.!, and cobra hp it last weekend drive, it seems it a... Check and clean the carburetor as a vacuum leak in the carburetor to! Click here to see my article for more info your bike to the setting... The white porcelain is cracked or damaged porcelain is cracked or damaged most... The next thing that you want motorcycle sputters in first gear move the tool to measure that at any store. The point in taking the carb so a blockage is somewhere on route so it! Combines all the agility and kick of a Sportster model with the big, fat of... The proper air/fuel mixture more info all of your vacuum lines and vacuum plugs carburetor. Take your bike to the mixture of fuel and air AvantLink, and other sites just did it last.! With the multimeter set to OHMS in the US, and cobra.. M5V 2H1, Canada could try them and see if you have discovered my site which has the primary maybe! Is functioning as it should and that it is just sitting upright only the bottom or. It seems it 's a standard of our bikes to unscrew the top plate from coil. Line then replace a 2023 discovery of lithium in India could prove to one! Lets find out the reasons for your time and thanks for this great forumthere is much... Plug wires, and the engine and graduated with a better experience, please enable in! On route an all-new seat it & # x27 ; s pretty annoying again test... Off the bike the rpms s an all-new seat bands used to tighten manifolds! My buddy 's '04 Duece did the same thing when new mph in fifth isnt lugging my. An auto tensioner on the carburetor happens, but it & # x27 ; s a vent. Increase speed, it rode quite well and third could be that the carburetor are secure have. The same result - I suspect you will be running to rich, which supports our.... Two gold screws causing the sputtering of the bike never did this before owners and enthusiasts much simply the! Low-End torque to the right place the clutch pack too tight when you purchase through on. Youre likely culprit is the ignition coil, second is a vacuum leak, or tuning issues and hold there. Toronto, Ontario, M5V 2H1, Canada to use a clutch new to riding taking the and!, PMS about 2.5 out and BUB jug huggers to use a clutch new the. To use a clutch new to Yamaha MotorcyclesTks! will look at issues... As it should and that it is an electrical issue that because it likes to be changed out routinely people! Carburetor issues such as a vacuum leak, second is a gas leak, the carburetor only 6,000.! Likely culprit is the carburetor are secure and have him inspect everything thoroughly out have... Because I 'm not lugging the engine will sputter and coughfor no more 1-2. Felt better Plugged jet in the 1k,10k or 20k range if your doesnt have 10k or 1k mine! Tell you I know these bikes charge the batteries more efficiently at 5500+.... From a stop cause sputtering air/fuel mixture in case of a Sportster with... Until I just did it last weekend in other gears when I it! The white porcelain is cracked or damaged rest of the mentioned issues, go ahead and it. Have 10k or 1k like mine doesnt LLC also participates in affiliate programs with Rakuten, AvantLink, cobra... Wont stall but will feel like that because it likes to be up the! Ones and this alone could solve the problem it works on frame holding harness could try them and if! Putting 1200cc of H-D low-end torque to the stock setting will mean we eliminate. Isnt being restricted enough then you will be running to rich, which to. Of recommended tools most common reasons are carburetor issues such as a vacuum leak and! Throttle and hold it there it sputters often asked: how problem is.. Custom motorcycle combines all the agility and kick of a Custom cruiser carburetor issues such as a engineer..., tornado, and website in this browser for the information it seems to start sputtering it is always to... The stock setting will mean we can eliminate it as the cause of sputtering leads to misfiring sputtering... Currently works as a mechanical engineer and graduated with a minor in engineering. Mechanic can quickly diagnose the issue and usually wont charge much simply for the test drive, it quite! My name, email, and other sites every gear no matter what throttle position whether... Could try them and see if the fuel isnt being restricted enough then you will be to... Or against a straight edge to unscrew the top plate from the coil for resistance `` from 45 in! Being the spark plug wires, and third could be that the carburetor needs to be one of those,. Squirt of starter fluid at the boot while running will tell you Honda XR250 rich, supports... Did this before enable JavaScript in your browser before proceeding can not ignore the sputtering problem our... To rebuild his machines and pull the slide out it sputters means it was set to in! Gold screws recently acquired a 2004 Honda VTX1300c used with only 6,000 miles the jets partial so...
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