Posts
41
Joined
12/13/2016
Location
White Swan, WA, USA
Im rebuilding a blown up CR250 two stroke for a friend of mine. It was in pretty bad shape, whoever "rebuilt" it last left a lot of the important bolts/nuts loose, used some unknown type of grease to coat all the bearings (which then made a mess out of the crankcase) and in general just did a poor job.
Ive replaced the crank bearings, the crank, all the seals/gaskets, a lot of the transmission washers (which were missing), a few tranny bearings, and most of the bolts/nuts/washers.
Anyway, I have it all torn down and am about to start reassembling everything, but when I put the two case halves together, there is a pretty good mismatch on the cylinder mating surface. Should I re-machine the surface to make them sit flush? Its a good 0.005" or more step.
How much could I get away with cutting away without affecting the compression ratio? Or will the base gasket take care of it?
Ive replaced the crank bearings, the crank, all the seals/gaskets, a lot of the transmission washers (which were missing), a few tranny bearings, and most of the bolts/nuts/washers.
Anyway, I have it all torn down and am about to start reassembling everything, but when I put the two case halves together, there is a pretty good mismatch on the cylinder mating surface. Should I re-machine the surface to make them sit flush? Its a good 0.005" or more step.
How much could I get away with cutting away without affecting the compression ratio? Or will the base gasket take care of it?
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I might just let it go and see if the base gasket takes care of it. 0.005" was an approximation but its bigger than what I would accept as normal.
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