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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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<blockquote data-quote="greg brillus" data-source="post: 125728" data-attributes="member: 597"><p>Bill you can but the lock ring was a safety measure.......I've seen pre war alloy heads where the guides came loose.........this on a TTR big fin head (I have it here at present and it is a real mess) My guess is the factory played around with the press in only guides pre war and had issues with them, so decided on the post war ones to add the lock rings. The later TP heads do have stem seals, these are the ones with the tiny decompression hole between the valve seats.......they have flush guides as well but have a small rebate cut down from the top and the button sized seal pressed in. It is very marginal and I do wonder how they will last.........This mod could be done on the Heads like Bills one above. If the bike has a side stand only, then it will readily pool oil around the guides and on a hot engine this will run past the stems easily. It would not be too hard to make a simple spot facing tool using an old valve stem and a piece of tool steel to carry out a seal mod.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 125728, member: 597"] Bill you can but the lock ring was a safety measure.......I've seen pre war alloy heads where the guides came loose.........this on a TTR big fin head (I have it here at present and it is a real mess) My guess is the factory played around with the press in only guides pre war and had issues with them, so decided on the post war ones to add the lock rings. The later TP heads do have stem seals, these are the ones with the tiny decompression hole between the valve seats.......they have flush guides as well but have a small rebate cut down from the top and the button sized seal pressed in. It is very marginal and I do wonder how they will last.........This mod could be done on the Heads like Bills one above. If the bike has a side stand only, then it will readily pool oil around the guides and on a hot engine this will run past the stems easily. It would not be too hard to make a simple spot facing tool using an old valve stem and a piece of tool steel to carry out a seal mod. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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