head shim and valve timing

[tylerearl88]

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Anyone have instructions on doing this. I have removed the head and installed the shim the way powderlites instructions say but I am a little confused on the valve timing part. If anyone has some more precise instructions or input that would be great. I have kept all the pieces seperate so i can put them back exactly where they came from but should I have marked witch side of the cams was facing up or will it only go one way. I had it at tdc when I removed them. Also when I took the last bolt out of the cam gears the cams rolled one way very slightly. Is this normal? This is on an 08 nytro.

Thanks.

 

[lakercr]

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Anyone have instructions on doing this. I have removed the head and installed the shim the way powderlites instructions say but I am a little confused on the valve timing part. If anyone has some more precise instructions or input that would be great. I have kept all the pieces seperate so i can put them back exactly where they came from but should I have marked witch side of the cams was facing up or will it only go one way. I had it at tdc when I removed them. Also when I took the last bolt out of the cam gears the cams rolled one way very slightly. Is this normal? This is on an 08 nytro.

Thanks.

Cams rolling a bit would be normal. If you search by my user name there's a post from a few years back that details the build of your engine. There isn't a ton of info specific to cam timing, but maybe enough to answer you question(s).

 

[HURRICANE]

I will talk you through it if you want to give me a call.I'm fairly close to you.It's not hard to do and yu'll get it right away once we talk about it.613 925 5171 days
Dave

 

[jd0270]

The MC express kit I have helped install in the past is likely similar. by raising the cylinder you are advancing both the intake and exhaust timing significantly. The idea is to slot the timing gears to return the cam's back to there original positions, but the gears will still look significantly advanced. We scribe a line across the cam and gears, and slot the holes one at a time untill a feeler gage of the specified thickness fits between the two scribed lines. You will need a 1/4" cylindrical carbied die grinding bit, the gears have some significant surface hardening!

As for timing I recommend you review the Yamaha service manual.

Things that are critically important are that you properly decompress and 'cock' the cam chain tensioner, make sure your valve clearances are correct(you could lose a shim if your not carefull) also your cam timing will look slightly advanced on both sprockets, but the holes in the camshaft must line up with the caps or you have done something wrong.

Tip, install the intake cam in first with the gear on it, line up the timing then zip tie it to the chain, than install the exhaust cam with sprocket already attached and zip tie it once you think its right, leave the zip ties on untill you install the tensioner and then roll it over several time checking to make sure its right. Be carefull when seating the camshaft caps, do it slowly and evenly making sure the dowels and such seat properly.

 

[TWIN TURBO]

Go on my web site I have instructions for Degreeing cams

 

[tylerearl88]

Thanks alot everyone I got it done this weekend. Phoned dave and he explained everything to me. Thanks alot dave.

 

[machzrobbie]

Thanks alot everyone I got it done this weekend. Phoned dave and he explained everything to me. Thanks alot dave.

That Dave guy sure is a great guy! Always helpful