Hi, yes it does have the woodruf key, but there was some play. I am however now completely confused (easily done!). When I took the cam belt off, the camshaft sprocket mark was pointing at the TDC mark (top of the case). Both valves were closed. They are now both open, and to get to a position where both valves are fully closed, the cam has rotated through 180 degrees? No idea how this could have happened. The sprocket on the cam is keyed on (I am assuming so)
Any ideas?
Ignition Timing
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MickeyMoto
- Posts: 2683
- Joined: 22 Nov 2008 17:41
- Location: Even further oop North
Re: Ignition Timing
At tdc on the compression stroke on the front cylinder the dot on the camshaft wheel is 180 degrees from the tdc mark on the crankcase. At this point the dot on the crankshaft sprocket should align with the dot on the crankcase.
Well, that was how mine was when I changed the belt two weeks ago
One thing to look at is when the cambelt is removed the camshaft will turn as cylinder 2 is somewhere in its cycle and a valve will be open to some degree and the spring tension will unwind pushing the cam around. I always check the crank mark and set the cam dot 180 degrees from the tdc marker before fitting the belt and then checking it with the belt partially on.
Well, that was how mine was when I changed the belt two weeks ago
One thing to look at is when the cambelt is removed the camshaft will turn as cylinder 2 is somewhere in its cycle and a valve will be open to some degree and the spring tension will unwind pushing the cam around. I always check the crank mark and set the cam dot 180 degrees from the tdc marker before fitting the belt and then checking it with the belt partially on.