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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Is it the valve guides, the cylinder sleeve or the piston?
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<blockquote data-quote="chankly bore" data-source="post: 50891" data-attributes="member: 317"><p>Unless you have had some energetic Rwandan primate hefting at the cylinder head bolts, then the alignment of the top guide-lower guide register and valve seat should still be O.K. That being the case, bore out an upper guide to 3/8" and use a piloted reamer to ream your new lower guides. Kemp sealed guides are a great fix. Make sure you use a low ash oil so you don't get the stuff burning on to the exhaust valve. Check that the rocker tunnel hasn't broken through to the exhaust port-don't ask me how I know this problem!I have had success with .002" clearance exhaust and Brasso clearance inlet. Heed the above advice re piston oil feed.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 50891, member: 317"] Unless you have had some energetic Rwandan primate hefting at the cylinder head bolts, then the alignment of the top guide-lower guide register and valve seat should still be O.K. That being the case, bore out an upper guide to 3/8" and use a piloted reamer to ream your new lower guides. Kemp sealed guides are a great fix. Make sure you use a low ash oil so you don't get the stuff burning on to the exhaust valve. Check that the rocker tunnel hasn't broken through to the exhaust port-don't ask me how I know this problem!I have had success with .002" clearance exhaust and Brasso clearance inlet. Heed the above advice re piston oil feed. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Is it the valve guides, the cylinder sleeve or the piston?
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