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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="Ducvelo" data-source="post: 51261" data-attributes="member: 2564"><p>Just to say, I lifted heads etc and examined. An over-enthusiastic porting of the inlet port on the No 1 head by a would-be racer in the past had broken through into the rocker tunnel. This had been filled (looks like an alloy weld) but this had now cracked and oil was seeping into the port. I guess under vacuum quite a draw of oil. Any views on best way to repair this crack - it's only quite small, but of course the alloy heats up a bit?</p><p>Guides also have quite a lot of clearance so I'll do these as well, and the liners - feels expensive. Any views on whether to fit the oil seals?</p></blockquote><p></p>
[QUOTE="Ducvelo, post: 51261, member: 2564"] Just to say, I lifted heads etc and examined. An over-enthusiastic porting of the inlet port on the No 1 head by a would-be racer in the past had broken through into the rocker tunnel. This had been filled (looks like an alloy weld) but this had now cracked and oil was seeping into the port. I guess under vacuum quite a draw of oil. Any views on best way to repair this crack - it's only quite small, but of course the alloy heats up a bit? Guides also have quite a lot of clearance so I'll do these as well, and the liners - feels expensive. Any views on whether to fit the oil seals? [/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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