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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Single or Twin Start Oil Pump
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<blockquote data-quote="timetraveller" data-source="post: 117934" data-attributes="member: 456"><p>Trouble with this question Marcus is that you will get lots of opposing views. Mine is that the twin start pump is well worth the hassle of fitting and the problem of oil coming out of the filler cap is just not there if one fits a curved deflector to aim the returning oil flow downwards, rather than towards the opposite side of the filler neck. I used a bit of a can (baked bean or similar) and held it in place with the screw which is supposed to limit the oil flow to the rear chain. It cost nothing and took a few minutes to make and install. The problem is/was that several years ago someone made a twin start worm without inclining the teeth on the oil plunger... The other problem was that someone also made the teeth in the plunger with too large a radius cutter and thus the run out of the gears was too shallow and caused very early wear on both components. ClevTrev's mod is a really nice idea. I have never found a down side to having the oil going round faster.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 117934, member: 456"] Trouble with this question Marcus is that you will get lots of opposing views. Mine is that the twin start pump is well worth the hassle of fitting and the problem of oil coming out of the filler cap is just not there if one fits a curved deflector to aim the returning oil flow downwards, rather than towards the opposite side of the filler neck. I used a bit of a can (baked bean or similar) and held it in place with the screw which is supposed to limit the oil flow to the rear chain. It cost nothing and took a few minutes to make and install. The problem is/was that several years ago someone made a twin start worm without inclining the teeth on the oil plunger... The other problem was that someone also made the teeth in the plunger with too large a radius cutter and thus the run out of the gears was too shallow and caused very early wear on both components. ClevTrev's mod is a really nice idea. I have never found a down side to having the oil going round faster. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Single or Twin Start Oil Pump
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