KRMit Posted March 12, 2004 Report Share Posted March 12, 2004 I took my airbox off tonight and made sure my throttle slides are in sync. I started revving the bike up feeling the exhaust. One side was firing more consistently at first, but things evened out once the bike warmed up some. I slowly revved it up until the powerband started kicking in and suddenly the left cylinder cut out completely while the right revved on up. I swapped the spark plugs, but that didn't make any difference. Anyone have any ideas on where to start? Can I safely swap the plug wires or does that mess up the firing? Could it be due to the exhaust? I bought the pipes used and I don't remember this problem with the stockers. I've never replaced the packing either. Quote Link to comment Share on other sites More sharing options...
MotulMonsta Posted March 12, 2004 Report Share Posted March 12, 2004 Yeah you can swap the plug wires. The coil fires both plugs at once so this won't hurt anything. Sounds like you got a jet that's clogged up a bit. Got gunk in the float bowl or, just ran out of fuel in the one carb. Did you change your fuel lines? Quote Link to comment Share on other sites More sharing options...
KRMit Posted March 12, 2004 Author Report Share Posted March 12, 2004 Yeah you can swap the plug wires. The coil fires both plugs at once so this won't hurt anything. Sounds like you got a jet that's clogged up a bit. Got gunk in the float bowl or, just ran out of fuel in the one carb. Did you change your fuel lines? This has been a problem for some time and I've since rejetted and cleaned carbs. Quote Link to comment Share on other sites More sharing options...
MotulMonsta Posted March 12, 2004 Report Share Posted March 12, 2004 What I would do..I had the same happen to me..is check both plugs for spark..then I'd put my thumb over the plug hole and guestamate compression. After that I'd clean the carbs and pull EVERYTHING inside there apart..dirt will hide in the damnest places. Then while the carbs are out I'd check the reeds. Then I'd reinstall the carbs, check the sync and action of the carbs. after that i'd try to run it again. If the problem still persists I'd disconnect the torrs completly check again. If still the same and it's always the same cylinder I'd double check the float adjustment and fuel flow..if that come out good then I'd replace the coil..if still no luck I would double check everything again, paying close attention to the plugs..are they rich, lean...what's going on inside that motor. Hopefully the problem will surface before a costly tear down of the whole motor and electrical system that will pursue. When I had this problem...turned out a TINY speck if dirt lodged itself inside the needle jet and wreaked havoc on fuel flow. Do you have a fuel filter? Quote Link to comment Share on other sites More sharing options...
KRMit Posted March 12, 2004 Author Report Share Posted March 12, 2004 No fuel filter. I know where the pilot and main jets are, but where's the needle jet? This problem has been very persistent. I don't really think it's fuel flow cause both cylinders pull pretty good at full throttle. This has been bugging me since I got my pipes a year or two ago. I may have just not noticed it, but that seems to be when it started. I'm tempted to go back to the stock pipes and see what happens. I'll probably break down and try the things you've listed. I do have an extra set of reeds so I can try swapping. I'm including a pic of my reeds in this post. Quote Link to comment Share on other sites More sharing options...
boonman Posted March 12, 2004 Report Share Posted March 12, 2004 Did you re-jet after you switched pipes? What do the plugs look like? It does sound as though you have a clogged jet, bad reed, or a loose connection..... Check the primary wires on the coil... (the orange and black) Quote Link to comment Share on other sites More sharing options...
MotulMonsta Posted March 12, 2004 Report Share Posted March 12, 2004 The reeds look fine. The needle jet is what the main jet screws into. it has a lot of tiny little holes that help to atomize the fuel. If that's gunked, it won't work right. It's funny how it only affects one cylinder. Check the intake boot for cracks, they usualy crack right where the ballance tube goes in. If it's been doing this for that long..I'd switch back to the stock pipes and see if it runs better. There are two tangs on the flywheel make shue they are clean and not worn down. There is also a little black pickup on the stator, clean that up a bit. Those tangs and that pickup control the timing. if they are messed up, your timing would be off....the cdi could be bad...it doen't pick up the signal to fire the plugs at the right time...so in essence it's only firing one cylinder. But I wouldn't worry too much about that until you've made shure that everything else is good. Compressed air and carb cleaner..spray out every passage in the carbs wit it, undo everything..make SHURE you count the turns it takes for the idle and air screw..both carbs should be set exactly alike..if one air screw is 2 turns out while the other is 1 1/2..that's your problem. After you clean those carbs up REAL good and let them dry, reintall your floats and make shure they're at the right angle. I forgot exactly what it should be at, but I would check to make shure that the floats close the fuel valve when they are about 1/6 of the way to being all the way up. Make shure both floats are set exactly alike. Quote Link to comment Share on other sites More sharing options...
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