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Old 12-19-2011, 10:59 AM
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DaveC DaveC is offline
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Join Date: Jul 2010
Location: Boise, ID
Posts: 967
Default Re: +7 mph by fixxing poor quality on 66cc

Originally Posted by Motorbikermark View Post
I'm thinking I may replace all the studs and screws with hardened steel hex bolts. Would look trick wouldn't worry about stripping philips head screws, and no length issues or thread depth issues.
They are a little spendy but not too bad but sick bike parts has Allen-head cap screws in a kit all ready to go. With the countersunk holes on these motors a hexhead bolt would ride on the surface of the housing and would have very poor sealing properties. On intakes and exhausts you get a little more clearance for the bolthead. Tapping the holes really needs to be done if either type of bolt is used.
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