First my magnum 425 starts miss out at high speed. Second in your opion is it worth rebuilding a 95 magnum 425 engine

 

Engine miss can be caused by most anything from an electrical problem to carburetion.Just have to track it down. Rebuilding? Depends on what all's wrong. A top end if that's all that's needed is still cheaper than a new atv if the rest of the machine is in decent shape.