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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Advice on "chasing oil leaks" - here's a thread that should run and run.....
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<blockquote data-quote="Vic Youel" data-source="post: 3469" data-attributes="member: 87"><p>Hi Stuart,</p><p></p><p>I would leave those 5/16 inch dia long crankcase bolts well alone; you could get yorself into trouble there. There are quite a lot of them and you cannot easily access both ends. Sounds like the exhaust valve lifter entry point; there is a mod with and extra rubber seal. I'll have a look for it and send it to you.</p><p></p><p>The breather has always been recognised as rather inadequate and with spirited riding a tea spoon can make a real mess. I live with much worse leaks and tell critics that it helps prevent corrosion!! From memory, there are some early MPH articles about sharpening the slot in the timed breather to make a little improvement.</p><p></p><p>One rider in your section has made an excellent mod using a Ducati breather that is out of sight; much nicer than the one time ubiquitous elephant trunk of the eighties.</p><p></p><p>By the way the gearbox level should be just up to the bottom of the stick; any higher and it stands a risk of leaking through to the clutch eventually...... also check the chaincase oil level now and again because crankcase pressure can push up the oil level and again eventually cause clutch slip when it gets past the seals.</p><p></p><p>All the best</p><p></p><p>Vic</p></blockquote><p></p>
[QUOTE="Vic Youel, post: 3469, member: 87"] Hi Stuart, I would leave those 5/16 inch dia long crankcase bolts well alone; you could get yorself into trouble there. There are quite a lot of them and you cannot easily access both ends. Sounds like the exhaust valve lifter entry point; there is a mod with and extra rubber seal. I'll have a look for it and send it to you. The breather has always been recognised as rather inadequate and with spirited riding a tea spoon can make a real mess. I live with much worse leaks and tell critics that it helps prevent corrosion!! From memory, there are some early MPH articles about sharpening the slot in the timed breather to make a little improvement. One rider in your section has made an excellent mod using a Ducati breather that is out of sight; much nicer than the one time ubiquitous elephant trunk of the eighties. By the way the gearbox level should be just up to the bottom of the stick; any higher and it stands a risk of leaking through to the clutch eventually...... also check the chaincase oil level now and again because crankcase pressure can push up the oil level and again eventually cause clutch slip when it gets past the seals. All the best Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Advice on "chasing oil leaks" - here's a thread that should run and run.....
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