I just had a K241 come back for the machine shop this week. Total bill including shop work was around $300 to $325. Motor still needs assembled. This does not include a carb kit. I did have to replace the exhaust valve and guide.
The crank pin usually needs to go .010 under and cylinder bore .010, .020 or .030 oversize.
Don't order any parts until you have motor apart and check the crank and cylinder bore.
A K321 takes a #30 carb. A K301 has a #26 carb. Your carb from a K301 will work......odds are it will be on the lean side.
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