Camshaft timings on a 77 GS 750

[Beanbag]

A friend is trying to do up his old bike and was chasing this information. I've tried looking on the net but wasn't able to find anything about it.

I'm not very mechanically minded but he asked me for maybe a diagram or information about this. He says with the engine cover removed there are 2 main sprockets and a little sprocket in the middle to hold down the chain (idler sprocket?) and this is what he needs information on.

Any help would be much appreciated.

[TheCafeKid]

Ok, what info does he need??

[blowerbike]

sounds like there may be a market for some used 750(valves).
tell your friend to buy a repair manual and study it(camshaft installation).
post back if he needs some help.
its all about having the crank at TDC and lining up the marks properly on the cam sprockets.

[dardoonk]

I have a 77 GS750 - If you are looking for help on installing the cams:
> Get a manual - This is just an explanation of where the marks go, not the complete installation. Here's the direct link from bikecliffs website for the manual - http://www.mtsac.edu/%7Ecliff/storag...arly8valve.pdf

> Timing at TDC for #1 piston.
> Install EX cam first - the #1 is pointed directly to the side of the head & the #2 mark is pointing directly up (in relation to the head). There is no slack in the camchain between the crank and the EX cam gear.
> Install the IN cam with the #3 mark pointing directly up (in relation to the head).
> Make sure that there are 20 pins from the #2 mark to the #3 mark. And, just like in the manual, the length of 20 pins, including the pin over each marked tooth creates a straight chain between the two cams.
>Don't be surprised if the IN cam rotates forward when you are installing the idler pulley (the small one).
>I used to have pics, but now I don't.

http://www.thegsresources.com/_forum/showthread.php?t=112783

Keep us posted

[Beanbag]

Thanks for the links, i'll print them out and see how he goes with it.