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bigwake

valves going out of spec?

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how often do the valves of an 03 yz450f go out of spec? if ever..totally stock bike?..thanx

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how often do the valves of an 03 yz450f go out of spec? if ever..totally stock bike?..thanx

Maybe never. I think Grayracers 03 has the original shims in the buckets.

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so yamahas are really reliable?

They are extremely reliable and durable.......but, only when they are properly maintained. :prof:

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Maybe never. I think Grayracers 03 has the original shims in the buckets.
It's all true. :shocked:

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My 03 has had one valve need to be shimmed in the ~2 years I have owned it. Checked them yesterday, and they are still exactly where they were around X-mas time.

Bike is stock, but is riden fairly hard on MX tracks. I've been happy with it so far (although I plan on buyying a new bike next summer).

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my 03 450 now a 470 also has original valve train....the bike is bullet proof with 2 adjustments in 4yrs and lots of hrs :thumbsup:

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My 2000 still had a few of the stock shims in it when I checked them last week. I only had to change them by 1 shim size.

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