valves going out of spec?

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

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.

cool stuff!! so yamahas are really reliable?..i've never ownded one until now

so yamahas are really reliable?

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

o ya! deffinately the biggest part of the reliability

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

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).

awesome! i love hearing that i made a good investment!

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:

awesome stuff

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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