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.
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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?1978 GS 1000 (since new)
1979 GS 1000 (The Fridge, superbike replica project)
1978 GS 1000 (parts)
1981 GS 850 (anyone want a project?)
1981 GPZ 550 (backroad screamer)
1970 450 Mk IIID (THUMP!)
2007 DRz 400S
1999 ATK 490ES
1994 DR 350SES -
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 normalComment
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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.Comment
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