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post #1 of 5 Old 11-18-19, 07:30 Thread Starter
gseddon
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Cam chain question

Hi, I've heard a ticking noise coming from my 2008 street triple. It's sitting on 40,000km, so I thought it's high time to pull it apart and check the tappets and the cam chain. The inlet valves were all in spec, and I have some replacement shims on the way for a couple of the exhaust valves which were just out of range.

From what I've seen here it seems likely that the cam chain tensioner is no good and is causing the ticking. However, when I put the piston at TDC to take the cams off, I saw that the cam gears were ever so slightly misaligned, as in the attached picture. Is this a symptom of a stretched chain, or is this because of incorrect tension from the tensioner? Not sure how many things I need to replace here - if it's the tensioner I'll just get one of those manual ones and be done with it.

Many thanks
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post #2 of 5 Old 11-18-19, 13:36
MGFChapin
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40,000km is right around the time I usually see enough chain stretch to warrant a new chain. Spend $100 and save your motor.
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post #3 of 5 Old 11-18-19, 17:34
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I'll second MGF above. A loose chain is not only liable for braking but also for insufficient tensioning from the spring-only tensioner that can mean jumped tooth/teeth and (again) a very damaged motor. My own chain was completely shot at 26K miles.


About the misalignment: I remember MacBandit saying that one of his cams was incorrectly set one tooth off from the factory. Yours don't look misaligned however. If they rotate half a tooth to the right they will align perfectly. You'll miss a bit on the TDC of course but I don't think that half a tooth can be considered "misalignment" - anyways all pics of cam alignment I've ever seen are something like yours.
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post #4 of 5 Old 11-18-19, 22:21 Thread Starter
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Thanks heaps guys, I'll get that chain replaced. I'm in Australia and they don't tend to have heaps of parts on hand. The correct chain for my MY is this fella http://www.2wheelpros.com/oem-parts/...0765-part.html
But it's on back order and will take 4-6 weeks to arrive (even through the official Triumph supplier here)
But the new version seems to be identical / very similar?
http://www.2wheelpros.com/oem-parts/...0768-part.html
Can this be substituted?
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post #5 of 5 Old 11-18-19, 22:41 Thread Starter
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Well I called triumph Australia and answered my own question - they went through about 4 minor revisions in the early years and they're very similar but it's best not to mix them just in case!
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