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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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<blockquote data-quote="John Appleton" data-source="post: 16505" data-attributes="member: 760"><p>Hi Norman, my bike only ever ran on semi synthetic and no problems with the new bores and pistons. If the bore job has been properly carried out there should be no excessive breather leakage,but when we built Petes engine from all new parts, including crank cases, we had a similar amount of oil spill from the breather to that which Tony is getting. Everything in the engine was standard, and all settings double checked for accuracy and still it leaked. Our own design of pressure relief breather completely cured the problem (or hid it) and 15000 miles later it is still ok.</p><p> It seems to me that Tony (who is an experienced owner of old bikes) has two options.</p><p>1) dismantle to check all is well, and possibly still have the leak or</p><p>2)fit a pressure relief system and enjoy the ride</p><p> </p><p> I have seen much written about the evils of modern oils but can only say that I cover quite high mileages in many strange places and only ever run on 10/40 semi synthetic because you can buy it anywhere should you need it, and I have never had a moments concern about lubrication.</p><p> John</p></blockquote><p></p>
[QUOTE="John Appleton, post: 16505, member: 760"] Hi Norman, my bike only ever ran on semi synthetic and no problems with the new bores and pistons. If the bore job has been properly carried out there should be no excessive breather leakage,but when we built Petes engine from all new parts, including crank cases, we had a similar amount of oil spill from the breather to that which Tony is getting. Everything in the engine was standard, and all settings double checked for accuracy and still it leaked. Our own design of pressure relief breather completely cured the problem (or hid it) and 15000 miles later it is still ok. It seems to me that Tony (who is an experienced owner of old bikes) has two options. 1) dismantle to check all is well, and possibly still have the leak or 2)fit a pressure relief system and enjoy the ride I have seen much written about the evils of modern oils but can only say that I cover quite high mileages in many strange places and only ever run on 10/40 semi synthetic because you can buy it anywhere should you need it, and I have never had a moments concern about lubrication. John [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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