I have been having some trouble with my 1989 exciter. It starts fine but once it gets driven around a bit the engine bogs down and it seems like it will stall because its ideling way to low. When im driving down the field I can be full throttle and it will only do about 50-60km, when it was running good I could do over 100km no problem. Would there be something wrong with the carburetor or possibly a weak coil? Thanks for any help.