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mcnaughb

Timing Chain Replacement

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After reading many threads, it looks like a timing chain replacement is good preventive maintenance and should be done regularly. The book says to replace the gear at the same time as the chain. Is that really necessary?

I have an 06 with a couple hundred hours on it that has never required any valve reshimming or anything, all still in spec. Should I replace my timing gear as well as the the chain?

Thanks.

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"Replace the gear" is carry-over text. It's general stuff that misses being edited out or elaborated on when it's moved from one manual to another.

In a YZF, the cam gears are pressed in place, and are not sold or serviced separately from the cams. It would cost over $300 to replace them just because it would be nice to. Similarly, the crank gear is cut directly on the left axle of the crank. It needs to be looked at more critically, because it wears over twice as rapidly as the cam gears by nature, but if you replace the cam chain soon enough, it won't be a problem either.

Don't replace any of the 3 unless they truly need to be. They probably don't.

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On a 02 YZ426 can the chain be replaced without removing the engine from the frame?

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I'm putting a new top end in my 07. I bought a timing chain from yamaha for $15. If my "old" chain is in spec did I just waste my money or can i count the new one as preventative maintainence or some sort? :thinking:

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I'm putting a new top end in my 07. I bought a timing chain from yamaha for $15. If my "old" chain is in spec did I just waste my money or can i count the new one as preventative maintainence or some sort? :thinking:
Can you tell me how long it will be before your old one goes bad?

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Can you tell me how long it will be before your old one goes bad?

Lol...kind of like waiting until you run out of gas before refueling.

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Lol...kind of like waiting until you run out of gas before refueling.
Or replacing your 3 year-old hard drive BEFORE it tanks.

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Regarding cam chains, the manual I have for my 07 450 doesn't show how to install/remove the cam chain. In fact, it doesn't say a damned thing about it. How does one remove/install the cam chain if it should need replacement?

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Thanks for the info. I was going to replace the timing chain when I adjusted my valves this weekend and now the unknown is now known.

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