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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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<blockquote data-quote="davidd" data-source="post: 92708" data-attributes="member: 1177"><p>Nigel,</p><p></p><p>As Greg and Martyn point out lack of clearance can put extra stress on the reciprocating parts and in turn the cam. On a ride back home from the North American rally one bike broke a push rod. The rocker had been hitting the guide seal a bit on every tap. The push rod finally became the weak link.</p><p></p><p>Occasionally, cam or follower will not meet the 60-65 hardness.</p><p></p><p>I have always set the height of the steady plate to the height dictated by the large idler cam (with the correct under steady plate shim) to make the height of all spindles the same. The idea was that the plate would not push or pull on the cam spindles. I have never had any shift, but I was trying to avoid that. I think you are correct that it is the lesser problem right now.</p><p></p><p>It does seem to have the signs of an oil problem, but so many of us have run 20W50 with stock locking rockers and my cam has .478 lifts with RD springs with a 7000 red line, so it is no picnic and no wear so far. It does look like it may not be the oil itself.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 92708, member: 1177"] Nigel, As Greg and Martyn point out lack of clearance can put extra stress on the reciprocating parts and in turn the cam. On a ride back home from the North American rally one bike broke a push rod. The rocker had been hitting the guide seal a bit on every tap. The push rod finally became the weak link. Occasionally, cam or follower will not meet the 60-65 hardness. I have always set the height of the steady plate to the height dictated by the large idler cam (with the correct under steady plate shim) to make the height of all spindles the same. The idea was that the plate would not push or pull on the cam spindles. I have never had any shift, but I was trying to avoid that. I think you are correct that it is the lesser problem right now. It does seem to have the signs of an oil problem, but so many of us have run 20W50 with stock locking rockers and my cam has .478 lifts with RD springs with a 7000 red line, so it is no picnic and no wear so far. It does look like it may not be the oil itself. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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