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Message: [QUOTE="julien_d, post: 1376880, member: 98751"] The only way it's going to suck transmission oil into the crank case is through a leaking crank seal, not through worn rings. The rings could improve a situation of low compression. You can not assume the compression is in service limits by feel of the kickstart lever. A good quick check for leaking crank seals is to pull the stator cover and see if any gas/oil residue is present around the flywheel. This is no guarantee, but a good place to start looking. The top of the piston will be stamped with either STD or an oversize mark. You need a service manual to get correct measurements for ring end gap, and piston clearance. [/QUOTE]