The manual does not say that they should 27 link dots in chain. Make sure you have the mark at the crank is at 23 degrees ATDC (after top dead center), and the two cam dots are level with the case. The exhaust lobes will be slightly lower than the Intake lobes (that is normal and shows in the manual). The 2013 cam timing is different than the later models, where the cams lobes are timed at TDC, with both in and out cam lobes looking like they are symetrical. After I timed my 2013 yz this way, I can now kick start the motor and runs strong. I can never kick it over timed to TDC
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I remove the spark plug and use a screwdriver to help me find tdc, Sometimes you can be 180 degrees off on you're marks
I figured out what was going on. The timing mark on the flywheel you time cams to is not true tdc. It is 23 degrees after tdc stated in manual that’s why the exhaust lobes are not the same as the intake lobes are. Also set them with 28 links between chains where dots are even with head surface. 27 link pins is wrong, go by the dots not the pins. Pretty sure yamaha came up with 27 cause they aren’t counting the pin that’s pretty much lined up with the dot on exhaust cam.
you are spot on, At the rebuild, I aligned the cam marks to TDC and I could not kick start the bike, I could only bump start it. After setting cams to 23 degrees, I was able to start the engine easy. It's differant than the later motors, where cams are set at TDC
Would this be like an 09 yz450f or completely different. Mine seems to be out of time after replacing head gasket. Can’t get the bloody thing started now
I’m running into the same issue with mine! I don’t know if I should set it at 27 links between dots or 28 which makes the dots level with head. I think imma go with 28 links so the dots are level like they should be
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The manual does not say that they should 27 link dots in chain. Make sure you have the mark at the crank is at 23 degrees ATDC (after top dead center), and the two cam dots are level with the case. The exhaust lobes will be slightly lower than the Intake lobes (that is normal and shows in the manual). The 2013 cam timing is different than the later models, where the cams lobes are timed at TDC, with both in and out cam lobes looking like they are symetrical. After I timed my 2013 yz this way, I can now kick start the motor and runs strong. I can never kick it over timed to TDC
I remove the spark plug and use a screwdriver to help me find tdc, Sometimes you can be 180 degrees off on you're marks
Why is that? I’m busy rebuild a yz250f and tdc markings on crank are nowhere near true tdc when I put a screwdriver in the plug hole….
I figured out what was going on. The timing mark on the flywheel you time cams to is not true tdc. It is 23 degrees after tdc stated in manual that’s why the exhaust lobes are not the same as the intake lobes are. Also set them with 28 links between chains where dots are even with head surface. 27 link pins is wrong, go by the dots not the pins. Pretty sure yamaha came up with 27 cause they aren’t counting the pin that’s pretty much lined up with the dot on exhaust cam.
So should you do cam timing to true tdc or is it best to time them to the mark on the flywheel?
you are spot on, At the rebuild, I aligned the cam marks to TDC and I could not kick start the bike, I could only bump start it. After setting cams to 23 degrees, I was able to start the engine easy. It's differant than the later motors, where cams are set at TDC
Would this be like an 09 yz450f or completely different. Mine seems to be out of time after replacing head gasket. Can’t get the bloody thing started now
Looks like you’re 180° out so wrong tdc which I think is my issue
I’m running into the same issue with mine! I don’t know if I should set it at 27 links between dots or 28 which makes the dots level with head. I think imma go with 28 links so the dots are level like they should be
Looks like 28 links, crank set at 23 degrees (ATDC marker) works, now I can kick start the motor, without bump starting it
My manual doesnt show them exactly the same
It's shows them almost exactly like this