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gs750 timing chain

  • Thread starter Thread starter david fava
  • Start date Start date
D

david fava

Guest
l am doing the top end on my gs750 and wondering should l change the timing chain as well.the bike has done 65,000 kms (40,000 miles).All the chain guides look like they have little wear so l will leave those.l have heard in australia that anything past 60,000kms you should look at replacing the timing chain.
 
David

The cam chain should go at least twice that many miles, however, the guides tend to get hard with age

I'd be replacing the 30 year old guides

Why are you doing the top end?
 
compression was getting low (80 psi) as well as an oil leak between head and barrel.l pulled it apart and found someone who previously had it apart pinched the edge of the timing tunnel o-ring which was the cause of the leak.found the original pistons to have excessive play.also exhaust valve seats were not seating correctly.getting valves reseated and head resurfaced.valve guides seam to be ok.putting a wiseco 844cc big bore kit.
this is why l asked about the timing chain while l have got it apart.as lam only doing topend you have to break the old timing chain.then when you replace with a new chain you have to use a link and use a special tool to peen over the pins on the link.l thought the hardness of the chain guides was normal
 
If you are doing the top end, it is only a couple of hours more time to split the cases & change the cam chain. Especially if you are doing an 844 kit! Also, use a ONE piece chain, NOT one with a master link!!! Do you think there is a REASON the factory uses endless chains, even in NEW bikes 30 years later? Ray.
 
rapidray said:
If you are doing the top end, it is only a couple of hours more time to split the cases & change the cam chain. Especially if you are doing an 844 kit! Also, use a ONE piece chain, NOT one with a master link!!! Do you think there is a REASON the factory uses endless chains, even in NEW bikes 30 years later? Ray.
Click to expand...

I couldn't have said it better myself.
 
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