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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: 80688" data-attributes="member: 3426"><p>I had everything set up to time my Mk2 cams at equal lift at 4 degrees BTDC and then discovered the cams had that .009 divot ground into them. I purchased a new set of Terry's cams that just arrived. They are his .380 lift, 105 degree lobe angle Mk2's with quieting ramps. The instructions say to set them with .170 lift inlet opening at TDC. I asked him about setting them with equal lift at 4 BTDC and his reply was: "you will not get a correct reading of the ramps better to do it with the.170 lift". I also inquired about measuring the lift at the follows and subtracting the rocker ratio from the .170. He said it would be roughly .010 to .012 less, but tends to vary a lot, so again, best to check for the .170 at the valve. I would really rather set them using a dial gauge on the rocker, so I guess I'll try that and check them at the valve later when I have the backlash sorted and the correct 1/2 time pinion selected. I'm assuming that as long as I do both cylinders the same... if they do end up being out a bit, at least they will be out the same amount and I can play with the keyway on the 1/2 time pinion to get them closer. Are there any landmines hidden in this path I'm taking?</p></blockquote><p></p>
[QUOTE="Cyborg, post: 80688, member: 3426"] I had everything set up to time my Mk2 cams at equal lift at 4 degrees BTDC and then discovered the cams had that .009 divot ground into them. I purchased a new set of Terry's cams that just arrived. They are his .380 lift, 105 degree lobe angle Mk2's with quieting ramps. The instructions say to set them with .170 lift inlet opening at TDC. I asked him about setting them with equal lift at 4 BTDC and his reply was: "you will not get a correct reading of the ramps better to do it with the.170 lift". I also inquired about measuring the lift at the follows and subtracting the rocker ratio from the .170. He said it would be roughly .010 to .012 less, but tends to vary a lot, so again, best to check for the .170 at the valve. I would really rather set them using a dial gauge on the rocker, so I guess I'll try that and check them at the valve later when I have the backlash sorted and the correct 1/2 time pinion selected. I'm assuming that as long as I do both cylinders the same... if they do end up being out a bit, at least they will be out the same amount and I can play with the keyway on the 1/2 time pinion to get them closer. Are there any landmines hidden in this path I'm taking? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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