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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Large Timing Gear Factory Markings
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<blockquote data-quote="ClassicBiker" data-source="post: 150904" data-attributes="member: 1632"><p>Vic,</p><p>When I timed up my Shadow as I mentioned in post #3, I timed the cams to equal lift at 4 degrees BTDC, I thought I did 5, but this photo I took shows otherwise. I purchased my new cams, cam pinions, and large idler and mounting boss from the Spares Co. The cams were not pressed into the pinions when I purchased them. Anyway, I did not disturb the 1/2 pinion at all. What I did notice is the timing mark on the 1/2 pinion was pointing straight up when I placed the rear cylinder a 4 degrees BTDC. Holding the rear cam at equal lift I aligned the mark on the pinion with the mark on the large idler, using and hammer and block of would I gave the pinion a sharp rap to start it on the shaft and used my hydraulic press to press it home. Using a surrogate for the front cam I aligned the double dots on the larger idler and front pinion, then rotated the crankshaft 410 degrees. I then placed temporary marks on the idler and front pinion. You can the front pinion one between the pushrod tubes in the photo. I then replaced the surrogate with the actual camshaft and rotated it to equal lift and aligned the temporary marks and repeated the pinion mounting process. When I rotated everything back 410 degrees, I didn't feel like rotating forward 100+ to get the rear marks to align again, that was then I noticed the rear cam slot was inline with a line running through the cam spindle and the crankshaft and the front cam slot was perpendicular and down from a line running through both cam spindles.</p><p>Myself I think doing equal lift at 4 degrees BTDC is the way to go. I would not trust timing marks on an unfamiliar engine. But I know that if I have all marks on all the pinions lined up and the slots are not close to being orientated as described above and/or the crank isn't at just before TDC or at TDC, then something is very wrong. I've read that the crank position is in the drawing in Richardson's book is at TDC and I've read it's at 4 degrees BTDC. I think when those slots align with a line from crank to spindle the cam is at equal lift. Which leads me to believe you could make a simple jig to spigot into the oil quill hole go, spigot into the cam spindle oil hole and drops a pin into the cam slot. But that assumes standard cams. </p><p></p><p>But that gets back to Tom's question. When Tom's Comet is at 4 degrees BTDC the slot in his camshaft should line up with the spindle and the crank and he can put his marks on it.</p><p>Steven</p><p></p><p>[ATTACH=full]46858[/ATTACH]</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 150904, member: 1632"] Vic, When I timed up my Shadow as I mentioned in post #3, I timed the cams to equal lift at 4 degrees BTDC, I thought I did 5, but this photo I took shows otherwise. I purchased my new cams, cam pinions, and large idler and mounting boss from the Spares Co. The cams were not pressed into the pinions when I purchased them. Anyway, I did not disturb the 1/2 pinion at all. What I did notice is the timing mark on the 1/2 pinion was pointing straight up when I placed the rear cylinder a 4 degrees BTDC. Holding the rear cam at equal lift I aligned the mark on the pinion with the mark on the large idler, using and hammer and block of would I gave the pinion a sharp rap to start it on the shaft and used my hydraulic press to press it home. Using a surrogate for the front cam I aligned the double dots on the larger idler and front pinion, then rotated the crankshaft 410 degrees. I then placed temporary marks on the idler and front pinion. You can the front pinion one between the pushrod tubes in the photo. I then replaced the surrogate with the actual camshaft and rotated it to equal lift and aligned the temporary marks and repeated the pinion mounting process. When I rotated everything back 410 degrees, I didn't feel like rotating forward 100+ to get the rear marks to align again, that was then I noticed the rear cam slot was inline with a line running through the cam spindle and the crankshaft and the front cam slot was perpendicular and down from a line running through both cam spindles. Myself I think doing equal lift at 4 degrees BTDC is the way to go. I would not trust timing marks on an unfamiliar engine. But I know that if I have all marks on all the pinions lined up and the slots are not close to being orientated as described above and/or the crank isn't at just before TDC or at TDC, then something is very wrong. I've read that the crank position is in the drawing in Richardson's book is at TDC and I've read it's at 4 degrees BTDC. I think when those slots align with a line from crank to spindle the cam is at equal lift. Which leads me to believe you could make a simple jig to spigot into the oil quill hole go, spigot into the cam spindle oil hole and drops a pin into the cam slot. But that assumes standard cams. But that gets back to Tom's question. When Tom's Comet is at 4 degrees BTDC the slot in his camshaft should line up with the spindle and the crank and he can put his marks on it. Steven [ATTACH type="full"]46858[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Large Timing Gear Factory Markings
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