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1979 GS750 Engine noise & cam chain specs.

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Guest
Hi guys,

Got a rhythmic phish phish phish type noise that sounds like its coming from the valve train when the bikes warming up. Not there when cold but starts after about 2 minutes of riding and goes away after 10 -15. Sounds a little like a train going over tracks if that makes sense and its only there between 3000 - 4000rpm. It does sound mechanical rather than a leak.

I've replaced exhaust gaskets and retorqued head (as there is an oil leak there, but no loss in compression or power). Also I cleaned and reset cam chain tensioner which moved freely. Last time I set the valves, a couple of the inlet clearances were at 0.09 mm - where specs say 0.03 - 0.08. That was 5000 kms ago so I am going to check valves again this weekend and fix them if they're still out. While the cover's off wanted to have a look at the cam chain, idler and cams.

I can't find any measurements in my clymer manual for cam chain wear specs can anyone help me out?

She's an 8 valve 1979 GS750 with 40,000 kms.

Thanks in advance.
 
Basscliff is hosting the 750 manual. Search out his name and then go to his site to download. The spec lists a length between between a specified number of pins on the chain. The chains are pretty durable, you should be fine at only 40k km.
 
Nessism said:
Basscliff is hosting the 750 manual. Search out his name and then go to his site to download. The spec lists a length between between a specified number of pins on the chain. The chains are pretty durable, you should be fine at only 40k km.
Click to expand...

Thanks for the replies. This manual doesn't have any measurement specifications either. But if the chain's most likely fine what else should I be looking for?
 
Coady said:
Thanks for the replies. This manual doesn't have any measurement specifications either. But if the chain's most likely fine what else should I be looking for?
Click to expand...

Sorry for the bad suggestion. The early Suzuki manuals are not as complete as some of the later ones. The image below is from the 850 manual but the info should be the same as your 750.

camchain.jpg
 
That is great. Thanks for going to the trouble of finding that. I imagine your right about them being the same as the 850.
 
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