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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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<blockquote data-quote="greg brillus" data-source="post: 85207" data-attributes="member: 597"><p>Hi there Steven, I buy them with the liners installed but not bored and honed as I have had instances where the clearance is way too small. I think the specs on the Omega piston say up to 0.003" but we give them 0.0035" just to be sure, remember we have a hot climate here in Australia and I don't want them to nip up. You won't really know what's going on until you strip it down. Just so you know, the recess in the head should be 0.125" in depth whereas the liner should sit above the top face of the muff by 0.128" when all is new, giving you about a 0.003" gap at the large surfaces of the muff and cylinder head. Over time and after several head/barrel removals and the lapping in of the two as you mentioned, this tolerance dissapears and this is where leaks start to occur. Sometimes people pull the head nuts down to stop the leak, and if they try really hard, it starts to collapse the alloy towers through the head..........<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" />............. Once you have it apart you will soon see what is going on. Cheers.............Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 85207, member: 597"] Hi there Steven, I buy them with the liners installed but not bored and honed as I have had instances where the clearance is way too small. I think the specs on the Omega piston say up to 0.003" but we give them 0.0035" just to be sure, remember we have a hot climate here in Australia and I don't want them to nip up. You won't really know what's going on until you strip it down. Just so you know, the recess in the head should be 0.125" in depth whereas the liner should sit above the top face of the muff by 0.128" when all is new, giving you about a 0.003" gap at the large surfaces of the muff and cylinder head. Over time and after several head/barrel removals and the lapping in of the two as you mentioned, this tolerance dissapears and this is where leaks start to occur. Sometimes people pull the head nuts down to stop the leak, and if they try really hard, it starts to collapse the alloy towers through the head..........:eek:............. Once you have it apart you will soon see what is going on. Cheers.............Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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