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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Breathers
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<blockquote data-quote="stumpy lord" data-source="post: 45211" data-attributes="member: 207"><p>Sounds as tho you were suffering from the well known two start pump problem i.e. a heavy return of oil and air splashing up on to the bottom of the oil cap, and being forced out of the breather hole by the excess of air being delivered to the oil tank by the oil pump [don't fore get that the oil pump delivers more air than oil to the tank] Most two start pump users get over the problem by fitting a small piece of stainless steel in side the neck of the oil filer neck held in place by the chain oil adjusting screw screw to direct the oil flow downwards into the tank and away from the cap.</p><p></p><p> I must admit to never having seen inside a series B oil tank, but I doubt that the second pipe you are talking about is a breather pipe. but rather a pipe for oiling the rear chain. I may of course be wrong, but do not see why the breathing of the fuel tank is O.K. with a small hole in the cap, and it is not sufficient for the oil tank. could it not be that the works found that an unobstructed feed to the chain caused a great many problems with over oiling, we all know how much oil can be blown out of the oil tank breather hole when having over filled the oil tank, can you imagine what it would be like on your rear tyre. consequently the outlet into the tank was modified to give some sort of control over the feed to the rear chain , unfortunately, as I said before, due to the pump running at different speeds and the oil getting thinner as it gets hot, it is just about impossible to adjust. that being the reason why most owners screw the adjusting screw down, and blank of the outlet</p><p></p><p> I am open to correction.</p><p> stumpy lord</p></blockquote><p></p>
[QUOTE="stumpy lord, post: 45211, member: 207"] Sounds as tho you were suffering from the well known two start pump problem i.e. a heavy return of oil and air splashing up on to the bottom of the oil cap, and being forced out of the breather hole by the excess of air being delivered to the oil tank by the oil pump [don't fore get that the oil pump delivers more air than oil to the tank] Most two start pump users get over the problem by fitting a small piece of stainless steel in side the neck of the oil filer neck held in place by the chain oil adjusting screw screw to direct the oil flow downwards into the tank and away from the cap. I must admit to never having seen inside a series B oil tank, but I doubt that the second pipe you are talking about is a breather pipe. but rather a pipe for oiling the rear chain. I may of course be wrong, but do not see why the breathing of the fuel tank is O.K. with a small hole in the cap, and it is not sufficient for the oil tank. could it not be that the works found that an unobstructed feed to the chain caused a great many problems with over oiling, we all know how much oil can be blown out of the oil tank breather hole when having over filled the oil tank, can you imagine what it would be like on your rear tyre. consequently the outlet into the tank was modified to give some sort of control over the feed to the rear chain , unfortunately, as I said before, due to the pump running at different speeds and the oil getting thinner as it gets hot, it is just about impossible to adjust. that being the reason why most owners screw the adjusting screw down, and blank of the outlet I am open to correction. stumpy lord [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Breathers
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