stevenrankin
Active member
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So what have you found? Is the problem solved? St.
So what have you found? Is the problem solved? St.
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Before you get to the timing chain, do you still have the old points system? Would be an easy to mount the old system and check again. Then let's see what you find checking sparks with the points.
Btw. the cup on the system has to be 90 deg. off because it is a 2:1 ratio crankshaft/camshaft, to cause a 180 degrees off on the flywheel.
/Guenther
I'm updating this post after some more digging into this. By removing the timing chain and crankshaft bearing I was able to confirm that the crankshaft and camshaft are timed together correctly. I reassembled everything and installed the old points and condenser. Turning the engine by hand I confirmed that the intake and exhaust valves are opening and closing correctly through the stroke. The points, though, are opening at the bottom of the pistons' stroke and closing at the top of their stroke, exactly backwards. It really seems like this bike has the wrong cam installed. Does anyone know of a cam from a different year bike that would cause this situation? I may degree the cam that's in the bike to check its exact timing numbers against the timing numbers published for this bike's stock cam to check for differences.
Any chance you have an incorrect starter installed that rotates the engine CCW when viewed from the front?
That was where I was headed with my question in post #27. But, the OP has indicated he’s rotating the engine CW when viewed from the front and that the OT mark is appearing in the timing window when the engine is rotated to TDC. Those two factors don’t mesh with seeing the points open and close 180 degrees from what would be expected as the engine was rotated CW as viewed from the front. At this point it’s hard to assess whether the issue is one of assembly error or misinterpretation of markings and such.
But yes, it’s time for the OP to bump the starter and have someone verify that the engine is being rotated CW as viewed from the front.
Best,
DeVern
to be sure that the timing mark on the cam shaft sprocket aligns with the timing mark on the crankshaft sprocket
I could not see the camshaft sprocket key