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Hello. i recently purchased a 400ex on facebook. they bump started it and it ran fine and drove fine and i came to the conclusion that it was the starter bc it didnt crank. i changed the starter and it cranks but wont start. the spark plug is new and getting good spark the carb is also new and getting gas and i have compression and adjusted the timing though i could have done it wrong. im not sure what is wrong can anyone help me out?
 

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I'll try - how did you adjust the timing - it's not adjustable?

Not starting with the electric starter, but starting by bump starting usually indicates the valves are tight and dropping compression - when it won't start cold without bump starting or using starting fluid, but runs fine and starts when hot, it's classic tight valve syndrome.

If the carb has been changed to a cheap POS Chinese carb, it could be a factor - hopefully you got the OEM carb with it as it is a better carb and relatively easy to repair.
 
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