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If you listen to the video it only makes the sound at the tops of the stroke when ch is why I think it has to do with the cam lobe maybe. Or the rocker arm or spring hitting
If you listen to the video it only makes the sound at the tops of the stroke when ch is why I think it has to do with the cam lobe maybe. Or the rocker arm or spring hitting
Yes, that makes sense... It actually seems to be at the bottom of the stroke from what I can tell. It really sounds like the sound is in the cam chest, but I'll start by pulling both rocker covers and listening for it.
Okay... I have both rockers off. Definitely no sign of contact in either of them. Rotating the engine still creates the same sound. I think I'll remove the pushrods one at a time, checking for the sound each time.
I started with the rear cylinder. Took out the exhaust pushrod, rotated the engine. It made the sound. Took out the intake rod. It made the sound. Moved to the front cylinder. Exhaust rod out. Made the sound. Intake rod out... The sound is gone! All of the lifters appear to move correctly, and seem to be properly filled with oil (visually).
Figures the problem was in the last one... I should have started from the front!
I think I'll try putting that one rod in without the tube, taking lots of care while adjusting, and see what happens...
Forgive my uncharacteristically filthy bike... The last time I rode I got stuck in heavy rain, and cleaning it hasn't yet been top of mind!
Last edited by F86; Sep 4, 2017 at 06:24 PM.
Reason: Add picture...
Well, I installed just the front intake pushrod, made certain I was at TDC on the base circle, set it at .135" of preload, and turned the motor. The sound is back, nice and loud. It was a little difficult by myself, but I tried to pinpoint it with a stethoscope while turning the rear wheel. Definitely not up top. It's the loudest right at the front of the cam cover, as far as I can tell.
I'm getting closer... I think I've found the source of the sound, but not the cause. It seems to be this guy making the noise, one of the Zipper's Red Shift twin piston hydraulic tensioners:
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