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s3706

00 426 timing

10 posts in this topic

If I set my timing using the yz timing specs the punch cog on the backside of the intake is slightly below the head but the exhaust punch cog is one link above the head. That is setting the top cogs 12 pins apart. Does this seem correct. If I change it to 13 pins apart on the top cog the intake is still slightly below the head and the exhaust changes to slightly above the head. I set it up for 13 pins apart and tried to fire it up but it backfires when I kick it. At one point it did fire up and run for about 30 seconds and that was the only time it started. Help Help!!

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i have mine exactly as you describe,my intake punch mark is down below the gasket surface and the exhaust is up a lil'bit,there are 12 pins between the 2 cams,when i first did mine it took forever to line the cams up but mine runs great so you should be fine :thumbsup:

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I have it set right now at 13 pins apart. If I change it to 12 pins apart the exhaust cog is one link above the head surface. Should I change it to 12 pins.

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as the cam chain stretches the ex punch will be above the head and the inlet punch will be below the head.

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I changed the timing lastnight to 12 pins and made sure everything was set correctly. I tried to start it and it wants to backfire while kicking it. Any suggestions on what to check next.

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My guess would be that the cam chain came off of the crank while you were timing your bike. I would suggest that you start from scratch. Set your intake cam to manual spec. (how it appears in the manual) Then set your exhaust cam off of your intake cam 12 pins. It worked for me.

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They should be facing away from one another.

I want to say that the intake lobe should be slightly lower than the exhaust lobe at TDC. This is from memory though...not 100% sure.

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