Hey guys. I have a 95 sport 400 with large ports in the piston, this machine will not rev above idle. tried everything. I also have a 98 xplorer tore apart and noticed the ports are considerably smaller?? can these pistons be swapped? does the sport have the wrong piston? It seems to be bouncing of a rev limiter!! when blacke wire un hooked there is no change! soooooooo confused. Any or all help is greatly appreciated!
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cannot change one worn piston in acylinder to another worn piston and cylinder, cylinders need to be bored to to size of piston that;s put in, not sure of port size from one year to another, , check compession on it while running, if not over 100 ,neeeds new piston, rings and bored
has 115 compression but wont rev up, idles like a dream. touch the throttle and it bounces off a rev limiter it seems like. i just noticed the ports in piston were different, curious if it maybe had a wrong piston. very confused why wont rev up.
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