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Hi, Can anyone verify by the picture what may be difference between those headbolts? I have two cases w. polished and one with those darker ones. Origin unknown. Thanks

Hi, I have a block where the crank end bearings are damaged. Could build new ones but what is the proper clearance ? 0,001" ? Does anyone know ?

Hi, Has anyone ever tried to fix the engine with those bearings (manufactured in China I presume) ? https://www.ebay.com/itm/155118439754 I have too much oil clearance in the first main bearing even with the thickest factory bearing (0.05mm/0.0019") and only option is to grind that surface...

Hi, I'm overhauling that cylinder with new seals but noticed that pit on the pistons pressure surface. Is there any of that on the brand new piston? Regards, Rauno

Hi! I had a project motor under strip down or perhaps even rebuilding process. Among many other things I found this. Is this common broblem or is someone just torqued bolts too hard?