SOURCE: The bike starts up fine with the choke out, but
hi cowboydesign
its starving for gas, either because the gas isnt getting to the carb or because the carb is clogged up. make sure your getting fuel to the carb first. remove the fuel line at the carb to make sure gas is flowing from the tank to the carb. if it is, your float might just be stuck or your carb is clogged up. you can try spraying carb cleaner in and around it, but that doesnt always work. if you never took a carb apart, i recommend finding someone that has.
Bill
EX
Standing Member of G.O.T.
SOURCE: Just started dying at low
Thank you for contacting FixYa with your inquiry.
This definitely sounds air/fuel related. Something has changed.
Drill down from to this link from the parts fiche on your engine
http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx
2002 > 640 LC4-E > ENGINE > CARBURETOR
Mikuni Carburetors have a lot of adjustments and jet combinations. Maybe your gaskets or an O-ring has dried out increasing air flow at bottom rpm speeds.
Worst case is if you have really run this bike a lot you might want to refresh the top end. I suspect its something simple and one of the above steps will get you back running correctly.
Kind regards,
TF
SOURCE: starts on choke but won't
It sounds like either the jets in the carb are plugged or the slide diaphragm in the carb has a hole in it. First take the air filter cover and air filter off the carb. Start the engine with the "choke". Do not get your face too close to the carb but look into the carb and gently rev the engine. The slide should move up and down. If so, the diaphragm is probably alright. If the bike has been sitting up for a good while, the gasoline in the float bowl would have evaporated and left behind a thick gummy residue. This may have the main and slow speed jets plugged up. The carb will have to be taken off the engine and professionally cleaned.
Good Luck
Steve
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