I have a 1999 yahama big bear 4 wheeler atv, 2 wheel drive and I need to know the plug gap size before I install them. Thanks

are you getting anything at all?.....you could check your ground wire(s) to make sure they have good contact on the bare frame metal

Smack the starter with a hammer or a wrench if the starter isn't turning over then it's bad if it does crank and won't start your CDI may be bad you've all ready replaced the little stuff sounds like it your starter is bad hope it not CD I if it is replace the stator as well and buy them on ebay it will save you a ton of money

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Got a 2001 400 big bear has good spark but won't fire off. I was told by a friend that it might have jumped time how would I go about timing this model

push it off a cliff

check your compression

clean your carb

Very vague question but I will try anyway if it died at full throttle and won't start again check the copression if it is below 90 psi it needs the top end rebuilt also when u pull the spark plug out look at it if it is whitish and dry definitely needs to be rebuilt running to lean if compression is good carb or electrical problem hope this helps you

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check battery u may need a jump or the oil is too cold and 4 wheeler needs to sit in a warm place for a hr or 2

1 thin wire in, one big fat wire to the spark plug. its not rocket science.

did you figure out the problem because mine just did the same thing.