banshee#44 Posted September 17, 2009 Report Share Posted September 17, 2009 my topend hasnt gone yet but when it does do i have to get it bored out? Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted September 17, 2009 Report Share Posted September 17, 2009 my topend hasnt gone yet but when it does do i have to get it bored out? When the cylinder isnt round and straight walls. You cant tell by looking at them but they wear egg shaped only upside down. They also get out of round. The only way to tell is to have them measured in various places with a bore dial gauges. When the clearance is to great then bore the cylinders to the next largest size required to get everthing back in specification. A compression test gives you a good idea. With a stock head at sea level when you start getting close to 100 psi it is time to take it appart and check it out. It might need bored or it might just need a quick hone and a new set of pistons of the same size installed. Quote Link to comment Share on other sites More sharing options...
Fullthrottle02 Posted September 17, 2009 Report Share Posted September 17, 2009 like jbooker82 said, all depends on how they measure, more often than not it will need to be bored, but heck since the jugs are off might as well get it ported, and since the jugs are out getting ported, might as well polish the side cover and port the reed cage, since the side covers are off, might as well split the engine cases check the crank, aw, heck with stock stroke time for 4mil........... lol, its a sickness that the wife can wait to find a cure for. Quote Link to comment Share on other sites More sharing options...
gst_r Posted September 17, 2009 Report Share Posted September 17, 2009 like jbooker82 said, all depends on how they measure, more often than not it will need to be bored, but heck since the jugs are off might as well get it ported, and since the jugs are out getting ported, might as well polish the side cover and port the reed cage, since the side covers are off, might as well split the engine cases check the crank, aw, heck with stock stroke time for 4mil........... lol, its a sickness that the wife can wait to find a cure for. x2 Quote Link to comment Share on other sites More sharing options...
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