mavguy Posted May 6, 2011 Report Posted May 6, 2011 I measured 45 pounds of compression with my shee, 55 with some oil poured down the bore (had been sitting for awhile). Decided to tear apart top end... Measured up internal clearances, and everything checks out in the higher end of the tolerance scales. The rings are shot with an end gap of more than 85 thou. Should I cheap out, replace rings and throw the thing back together? OR should I rebuild the top end completely? I have access to a shop so tearing down the top end, although a pain, is not a huge deal. Note-I just want the thing running for the summer, I can do a major rebuild next winter/when it blows up again! Quote
Infamous039 Posted May 6, 2011 Report Posted May 6, 2011 I say completely do the topend. Even if you re-ring it you will need to hone the cylinders to give them a fresh glaze. Might as well do it right and have no worries when you go out riding. Quote
volcrano Posted May 6, 2011 Report Posted May 6, 2011 I measured 45 pounds of compression with my shee, 55 with some oil poured down the bore (had been sitting for awhile). Decided to tear apart top end... Measured up internal clearances, and everything checks out in the higher end of the tolerance scales. The rings are shot with an end gap of more than 85 thou. Should I cheap out, replace rings and throw the thing back together? OR should I rebuild the top end completely? I have access to a shop so tearing down the top end, although a pain, is not a huge deal. Note-I just want the thing running for the summer, I can do a major rebuild next winter/when it blows up again! you at least need to run a mic thru the bore.its very possible its egg-shaped from wear and your going to be throwing your money away if u just do a re-ring.if the cyl is within tolerance and u hone it,u could re-ring it,but not recommended.if ur pistons were only like a year old or something and forged,thats a different story,but even then i would still put new top end bearings and rings on too.new piston and rings are always recommended in a rebuild,but like i said,if its forged and doesnt have too many hours and want to save money,could be a way to go.first off tho,check ur bore size down thru the cylinder to see where ur at. Quote
mavguy Posted May 11, 2011 Author Report Posted May 11, 2011 Ring end gap is in excess of 86 thou, spec says anywhere from 12-18, so they are definitely shot. Bore measured up ok, piston looks good as well. Engine did suck in sand while on last outing, GD stock airfilter setup. Could this have led to rapid ring wear? Going to cheap out and scotchbrite the cylinders myself, re-ring and then see how it goes Quote
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