i am having problems with my 250 bear tracker. I recently rebuilt the top end and it ran fine for a while. now it will start hard and run but will not run at full throttle. when it reaches mid to high rpms it shuts off and when it comes back down to lower rpms it starts again.
I put a new ricks cdi box on it but the new box would not send a spark to the plug. I put the old cdi back on and it started again. I exchanged the ricks box for a new one and got the same results, no spark. put the old one back on and it runs again.
Any help will be appreciated.