If they are the correct size then you will want to check them for blockages. The bike was put away for winter and I pulled it out to take it for a ride. It is possible for the ignition coil to not send enough spark to the spark plugs which will again cause misfires within the engine. As the dealers say. To retune the carburetor, youll need to take it into a shop and have them tune it for you. There are several reasons why a motorcycle sputters. Even a minor fault in the ignition can cause your bike to hesitate. BK breather , PMS about 2.5 out and BUB jug huggers. If you do find a blockage then you can use a pin from the wifes sewing box and this should fit into all holes. Fuel left in the carb when the bike isnt in use for a period of time will crystallise and that can break away and cause clogging. No hesitation in throttle. There are three main issues that can be caused from the carburetor that will make your motorcycle sputter. anyway. Leaks within a carburetor is usually caused by a brittle or cracked gasket that is just above the float bowl at the bottom of the carburetor. This site is for enthusiasts and curious minds.We love All Motorcyles. Try shifting into fifth at 70. Yet cant read the question . The screws of the engine are tightened during tuning. It's early in the morning and this is the best that I can come up with. Go to start the bike and check to see the plug is creating a healthy spark. It can be fixed with a trip to the mechanic easily. Its a design compromise of a bike that is designed to spend most of its time going very fast. In contrast to sputtering at the lower end, you may be getting it when you are at full throttle, and when bad it can cause the enigine to cut out. Come join the discussion about performance, modifications, troubleshooting . Man: Doctor it hurts when I put my finger in my eye. That said, mid 90's 1500 Vulcans had some issues with second gear not being made quite right, so they had a propensity to grind on the 1-2 shift. All of these factors combined will affect the performance of your bike. Improve timing advance. A motorcycle can cut out or stall for various . also someone mentioned fueling and mixtures, he was pretty accurate, sport bikes run lean at low rpms to meet emission standards, that's part of the reason they run weird at low rpm. Honda VTX 1300 / VTX 1800 Motorcycles Forum. If it stops, you know that it's a clogged vent line. I wish I could have taken a photo of my intake valves.they looked pretty dirty considering I've only got 15,000 miles. I'm happy to report that I've taken much of the advice noted above, most notably the comments from. Making sure everything is functioning as it should and that it is clean. Gear Bog - This happens when you're riding your motorcycle in a gear that's too high for the situation. The bike intakes air through the filter and if this is restrcited it can be an issue. Sounds like you may be in too high a geartry same thing in 4th. Over time, that threaded connection becomes corroded and rusted. I know how to use a clutch new to the bike not new to riding. Also, how long do you run with the choke on or halfway on? 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. Take out your spark plugs and make sure there is no nasty build up on them or any type of corrosion. A malfunctioning spark plug will cause the cylinder its connected with to misfire which will ultimately cause performance issues and the motorcycle to sputter. I can not understand this Lugging Problem. Take it out for tuning at least once a month. Upgrades: frame-sliders, fend-elim, tcp seatcowl, pazzo levers, LED taillight w/int.turn signals, puig double bubble blue tint windscreen, K&N filter, Carbon Scorpion Exhaust, yamaha tankpad, flush turnsignals gotta 7 way party bong at the sheriff's dept. 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. Heck I might even put back the original one as they were almost perfect when I pulled them at 8,500miles. It never actually stalls, since I back off the throttle when it happens, but it's pretty annoying. I can shift to 2nd,punch it,it pulls for split second,cuts out. Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so. Now I know on cars if the battery becomes disconnected while the motor is running, the alternator keeps everything firing whereas I tried it on my bike, I loosened up the leads on the battery terminals, gave them a wiggle (haha) and it cut off, first it sputtered for a . You can do that without taking if fully off the bike. You can cruise at 60 in fifth, but it wont accelerate very well. your motorcycle will sputter when accelerating. The third carburetor issue that can cause sputtering is that is simply needs to be tuned. This means it was set to 2.5 turns out. Don't engine brake down that far. Its a beast. At some point the screw would of been fully in and you may of managed 2 whole turns then a half turn on the third rotation. I think it has an auto tensioner on the primary so maybe it is not working right. The . Dirty air intake filter? It keeps doing it and I can't ride the bike. Pipes, jetted carb, air intake system? both mine n pal had change the TPS during the recall. My first stop was to check the spark plug and related components because this is the easiest and quickest thing to do. The setting dictates how much air can pass the screw and the more out the screw is turned the more air passes. How To Recover Them? 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. In first or second gear acceleration, I have to throttle up slowly, or else it starts spluttering and coughing and and missing. Also make sure the point isnt worn down and that the gap between the center and the ground electrode is the appropriate distance. What Happens to Stolen Motorcycles? It has been a long time coming, but we also knew it was . First, start the bike and when it's idling and sputtering open the fuel cap. 31 Years experience with Harley-Davidson motorcycles, licensed Motorcycle Mechanic, Shop Owner. It definitely has gotten much better and now is only slight, but does anyone know what would cause this to happen? if OK it can be tuned to correct. Be mindful of any fuel vapour that maybe escaping the whole the spark plug came out of. Content on vtxcafe.com is generated by its users. What is your bikes setup? What Would Be a Good Motorcycle Seat Height for a 5 Rider? Maybe screwed the clutch pack too tight when you put the springs in? Anything I should do? The spark plug is a CR6HSA or CR7HSA NGK. Soaking the clutch plates will not do anything for you're problem. This is best diagnosed through a mechanic if you suspect this is what is causing the sputtering problem. Less clean air means the jetting will become more rich, which can cause your dirt bike to bog. There are several reasons why a motorcycle sputters. Options. Sep 13, 2009. 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. 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. Don't believe them. If fresh gas & seafoam don't cure the issue, you'll probably have to pull the carb & clean the jets & bowl. Once clean and satisfactory reinstall the jets into the same holes they came out of. I don't notice any dip with the RPM's, just a small jerk, power, small jerk. So just to verify, when I'm at first gear and going to 7-8kRPM, shift quickly to second, and if it is the gear that is . The petcock has a vacuum line as well as part of the emission system. Typically with most pit bikes, the problem is going to be with the spark plug or the carburetor; with the fuel system being the primary culprit. If it helps then you need to richen the mix by raising the needle, or a larger jet. 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. The first is a vacuum leak, second is a gas leak, and third could be that the carburetor needs to be tuned. Up until this point, the engine runs smoothly and is a fun bike to ride. Essentially, their Can A Loose Motorcycle Chain Cause Vibration? Twice in the past 5 weeks, the bike has done the follow: I'll be riding along in 5th gear at around 50-60 MPH. Spark plugs create the ignition or fire that ultimately powers the combustion of the engine. 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. There can be many reasons why a motorcycle sputter. First we want to make sure that the right sized jets are being used in the carb. Starts great, idles great. 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 the motorcycle stalls with a jerk when put into gear, it may be due to the clutch plates binding together, a stretched clutch cable, a leaky master cylinder or a poorly tuned engine. Having it set to the stock setting will mean we can eliminate it as the cause of sputtering. Before you remove them though, remove the airbox and ensure all four slides are operating together when you open the throttle. It happenens with or without the auto-tuner engaged. $49.99 + $18.75 shipping. Motorcycle Wont Start After Winter: Why & What To Do. Is the end of the plug excessively wet or dry. The three things you need to create an . Click herefor more information if youre interested in viewing multiple videos that will help fix up your bike or if youre interested in completely building your dream motorcycle! You should also check where the AF is set, since that will affect the low rpms and idle. Have you tried accelerating to 70 in 4th & Then shift? It almost sounds like something with the carb. Remove the spark plug and examine it for problems carefully. Proper carburetor maintenance. For a better experience, please enable JavaScript in your browser before proceeding. Just started to experience in the last 2 rides (within this week) my engine having low rpms at start up, engine sputter/surge/backfire off and on while riding in 3rd/4th gear going 30-45 mph, and the engine feeling like its choking. ", Silver Fz6 Fazer >> Remus Exhaust(Carbon), BMC Air Filter * Givi Tall screen *Bagster tank bra * Ermax lower cowling, Goodridge Kevlar Braided Brake Line * voltmeter, Signal Dynamics BackOFF XP brake light modulator, http://www.sportbikes.net/forums/showthread.php?t=336594. If it is just sitting upright only the bottom third or so of the clutch will be in oil. 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. Use the same method to check you can see light with no obstructions. It sounds possible that it is an electrical issue. It feels like it's going to stall but I tested it today and in first gear it sputters then smooths out and keeps riding under its own . A notched clutch basket will not allow the fiber plates to slide & disengage. You followed the info on page 150 of the repair manual? This is probably the least likely case with the ignition. When a carburetor is out of adjustment, that means the air/fuel screw and the balance between the carburetors (if you have more than one) need to be readjusted. The most common reasons are carburetor issues such as a vacuum leak, fuel leak, or tuning issues. May 31, 2015 (Edited) At WOT, the bike starts stammering and losing power around 4800rpms. and our When you purchase through links on our site, we may earn an affiliate commission, which supports our community. ProjectDirtBike.com 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. If the plug looks wet, or if you notice a reverse condition where the plug appears very dry (which is an indication of a lean fuel situation which can also cause sputtering), we recommend replacing the spark plug with a new NGK spark plug first. The lack of air then leads to sputtering in your motorcycle. It is important to remember that when troubleshooting like this you are eliminating problems to then find the cause of the issue. I must hurry back to my comic book store, where I dispense the insults rather than absorb them". Thanks for your time and thanks for this great forumthere is so much great information and bikes on here! Also make sure the master cylinder is working correctly. The most common reasons are carburetor issues such as a vacuum leak, fuel leak, or tuning issues. Reply Quote. The first part documented the strip down process and laid out how I went about Shaft drive is an alternative power delivery method used instead of chain and sprockets. Not badly but enough to make it iffy. Normally one I'm doing 60 miles per hour, I slowly throttle to gain more speed, but the bike starts to sputter as if it doesn't want to go faster. In the ignition setup of the bike, look for the spark plug. 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