Timing marks on Crank - Yamaha Raptor Forum
 
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post #1 of 7 (permalink) Old 11-20-2007, 03:36 PM Thread Starter
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Timing marks on Crank

Quote:
Originally Posted by Mad Dog
Yes the mark is on the outer edge of the flywheel behind the small cover just above and to the right of the crank nut cover. There are I and H marks, check your manual for the correct settings and make sure you're on the TDC of the compression stroke when adjusting.
So do you line it up on the I or the H?

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post #2 of 7 (permalink) Old 11-20-2007, 03:38 PM
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Re: Timing marks on Crank

The "I" mark

When you're at tdc of the compression stroke you'll have a gap b/w the valve tips and rocker arm adjusters. If it's tight you're on the wrong stroke.

Mike

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post #3 of 7 (permalink) Old 11-20-2007, 03:45 PM Thread Starter
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Re: Timing marks on Crank

Roger, i just adjusted it a few days back, but i still get a loud ticking. I thought i had it right, but i guess not. Are the rockers supposed to drop a lot? It seems that they only go down a mm or less before the timing mark.

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post #4 of 7 (permalink) Old 11-20-2007, 03:49 PM
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Re: Timing marks on Crank

The gap is only going to be a few thousandths of an inch, but there will be a gap and that's what you're adjusting. If you're on the wrong stroke they will be right tight together. Try using a gauge smaller than your spec to test or just watch the rockers as the engine rotates.

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post #5 of 7 (permalink) Old 11-20-2007, 06:43 PM
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Re: Timing marks on Crank

If ya adjusted on the wrong one it will make them loose. I goofed up on that a few times cept it was something else. I'm still learning the tweaking on adjusting the valves. cause mine seem to tighten up as i ride. no matter how much i set the tightness on them. not as bad this time but still a little bit on the tight side. It is also a good idea to rotate the motor one more time after adjusting to double check them. cause if you did it wrong they will be either super tight or super loose.

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post #6 of 7 (permalink) Old 11-20-2007, 10:02 PM
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Re: Timing marks on Crank

Quote:
Originally Posted by ceanern
mine seem to tighten up as i ride. no matter how much i set the tightness on them.
That is because the intake valves are a soft metal and are erroded away by the harder valve seat, as the face of the valve is ate away by the harder seat, the valve receeds further up into the head and the stem gets closer to the racker arm, this is why they are tight every time you adjust them.
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post #7 of 7 (permalink) Old 11-21-2007, 06:21 PM
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Re: Timing marks on Crank

thanks!

03 Raptor 660
full CT racing exhaust, open air box with Proflow intake adapter plate, Full chassis Skid plate, Dyno Jet Kit, MSR handlebars, Parking brake block off plate, ASV Shortys

Near Future
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