Join Date: Jul 2002
Location: Maryborough Queensland
My 2 cents worth.
I replaced my timing chain and guides last week when I put the new head, cam, and water pump in.
Timing chain kit with guides, chain and gaskets was $75.
BUT, if you want to replace the bottom guide you have to drop the sump, it will not go on without doing this, boy did we try! My motor did not have a bottom guide in it, and neither did the motor I bought last week to get the head off. I spoke to lots of people about this and was told it seems a lot of mechanics don't put the bottom guide in. Now this is where it gets a little confusing I guess. The timing cover will not come off unless either you take the head off or the sump off. As I had the head off it was relatively easy to take the timing cover off. As I had to go to Brisbane on the week end and time was a bit short, I elected not to take the sump off and to leave the bottom guide out, I'll put it in the new motor I'm building up. Anyway, it's as quiet as, and I can't believe the difference. I guess the new head and XR6 cam helped.
If you do it yourself just make really sure you line up the timing marks before you take anything off.