Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

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Old Jul 14, 2022 | 01:05 PM
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How much crank run out is acceptable for a 107 bore kit and cams on a 103 HO twin cam motor ?
 
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Old Jul 15, 2022 | 02:22 PM
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Have my bike in for a 107 kit , found my run out @ .0054 and told me he won't build it if I don't true the crank 1st ,I knew this going in before hand, just hoping it wouldn't be the case .

He could put it back together or send the crank off to be trued , welded ,maybe rod bearings, Also found some scoring in my oil pump and cam plate , 34K on a 14 103HO motor .

I went ahead and ok'ed the crank work which he said he will install new lefty bearings on as well , and a S&S cam plate and oil pump, that blew the budget pretty well , but what do you do . I'll know I have a solid bottom end now and a good running motor for many miles to come.
 
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