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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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<blockquote data-quote="Cyborg" data-source="post: 80772" data-attributes="member: 3426"><p>So took a stab at setting the valve timing. Haven't checked lift at the valve yet, but so far.... set the rear cam for equal lift at 4 degrees BTDC. Gently locked the cam in place. Installed the 1/2 time pinion, but to line up the closest keyway I had to move the crank forward to about 2 degrees BTDC. Then rotated the crank 410 degrees because I figured it would be best for both cams to be timed the same. Put the cam in the freezer and the cam pinion in the oven to warm it up. Then installed the front cam, set equal lift and locked it in place as quickly as possible... ran to get the pinion out of the oven, lined it up to the teeth on the idler and gently tapped it onto the end of the cam ( just enough to get it to hold).... removed the nut and spacer holding the cam and ran over to the press to push the pinion all the way home. So now I have equal lift on the rear cam at 2 degrees BTDC and 2.5 BTDC degrees on the front cam. I assume this is close enough if some folks say that equal lift at TDC would be ok. I'm also assuming .5 degrees difference is just fine given the fact that there is a finite number of times one can remove and replace a cam pinion and the odds of getting it closer while maintaining my sanity is remote.</p><p>Just need to set up a forth dial gauge holder and I can plot both cylinders out in one go.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 80772, member: 3426"] So took a stab at setting the valve timing. Haven't checked lift at the valve yet, but so far.... set the rear cam for equal lift at 4 degrees BTDC. Gently locked the cam in place. Installed the 1/2 time pinion, but to line up the closest keyway I had to move the crank forward to about 2 degrees BTDC. Then rotated the crank 410 degrees because I figured it would be best for both cams to be timed the same. Put the cam in the freezer and the cam pinion in the oven to warm it up. Then installed the front cam, set equal lift and locked it in place as quickly as possible... ran to get the pinion out of the oven, lined it up to the teeth on the idler and gently tapped it onto the end of the cam ( just enough to get it to hold).... removed the nut and spacer holding the cam and ran over to the press to push the pinion all the way home. So now I have equal lift on the rear cam at 2 degrees BTDC and 2.5 BTDC degrees on the front cam. I assume this is close enough if some folks say that equal lift at TDC would be ok. I'm also assuming .5 degrees difference is just fine given the fact that there is a finite number of times one can remove and replace a cam pinion and the odds of getting it closer while maintaining my sanity is remote. Just need to set up a forth dial gauge holder and I can plot both cylinders out in one go. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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