Main Motorcycle: X.2007 Triumph Rocket III
Join Date: Feb 2009
Location: Melbourne, Australia
Other Motorcycle: X. 1971 Bonneville T120R
Extra Motorcycle: X. 1996 Yamaha TRX 850
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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First off, assuming everything else is correct (valve lash, timing, compression, etc...) you can only tune carbs one way. You must start with the main jet. When you get that right you move to the needle, and then finally to the pilot. If you try to do them out of order or more than one change at a time, you will chase your tail forever. Definitely sounds like the main is to big, but you have to do a plug chop at WOT to find out for sure with fresh plugs. Dial in the main jet and then move on the next jet.
The main jet size won't have any effect below 3/4 throttle.
Make sure the choke slides are pulled fully up by the choke cable,or just remove the choke slides and plug the hole in the carb top.If you plug the hole,make sure whatever you plug it with can't come loose and damage the engine.
If it 8-strokes at full throttle with 200 mains,try 180.2 sizes less than the smallest jet that causes 8-stroking is usually about right;it's a lot easier and quicker than trying to read plugs.
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