My Raptor has a mystry problem. It cuts out after 1/4 throttle like you momentarly shut the key off. Ive checked the parking brake rev limiter,coil,Plug,Volt reg box, and the carbs for loss of fuel. after checking the plug thats not a problem because it looks rich. (ie not firing the plug). I used all of these parts off my buddys 03 Raptor but the Ignition Box is different and I couldn't swap that out. Has any one lost an Ignition box before? Im ready to kill this thing please help!!!!!!! [img]i/expressions/face-icon-small-mad.gif[/img]

 

take abart the carb see if you have any crap in it
or mybe the rev limiter for reverse is not right and it thinks the tranny is in reverse
and u said it looked rich put a new plug in a see if it is any different

 

CDI Box , This is what im hearing for a couple of guys anyone lost one of these?

 

Check the fuses???

 

Sounds like the problem I had about 2 months ago. mine would run, shut off, run, shut off, at anything over 1/4 throttle. it also had a hard time starting and idleing, a little choke helped.

My parking break sensor had been disconnected for months when this problem started.

I checked the spark and it looked ok, maybe a little weak, changed the plug and it has been fine ever since.

It could be anything from spark plug to water in your fuel. water settles to the bottom of the floats and wont be sucked up until after 1/4 throttle. Usually when CDI's go they burn out altogether.

 

I rebuilt the carbs no change, Unpluged the parking brake Rev limiter at the clutch and that is a totally different sound than the problem under acceleration. Oh yah I've drained & cleaned the tank also! Still nothing changes it at all.......

 

Did you check your timming like Barlett said?

 

Cam timming is O.K. , Don't know how to check spark timming!!!!

 

The only way I would know how would be with a timming light.

 

then when your done that spend $5 on a plug.