CRF Valve issue

[Matt BissellMember]

Wondering if anyone has been been having similar problems with CRF450X inlet valve wear.
Had heard this was a problem but having to re-shim the clearances within approx. 1000-1500kms seems a bit excessive.
Don’t ride the girl that hard ( grade 3 trying to get fitter for grade 4 status ) and spoil her with heaps of services and love.( Maybe that’s the problem).
Can anyone recommend suitable upgrades ?
Am worried if I just keep re-shimming the valves will let go and with it my yearly ride budget !!

:dry: Please help !!!

Cheers ………Matt05

[GregMember]

How many times has it been re shimmed Matt, where do you live and how do you do your air filters first please mate?

TB

[TrentMember]

What year model too mate. My mates 07 has had similar issues I think.

[Matt BissellMember]

2005 Model

I bought with 1300k’s on and think those would of been original shims.
Replaced shims @ 2700k’s ( but must admit the gaps were only about 0.15 with new shims, max is 0.19 ). now have approx. 4000k’s ( having speedo problems ) and the same symptoms of poor starting are showing up( definitely valves again ).

Use a Twin Air filter and use shell spray on filter oil inside and out and regularly clean and re-oil.

Live in Rankin Park Newcastle

:woohoo: :silly: :side: :S

[Bruce CurtisMember]

Austblue, I think all of them have the same problems with valve recession, some people manage to catch all the fine grit in a really heavily oiled filter, but if you oil the filter like I do mine your valves will be dusted in a few rides. A set of stainless valves are reasonably priced, may rob you of a little power (sweet FA) but will last for yonks. Some people people are even buying them new and getting the dealers to insert SS valves before they pick them up.

I believe it is the only real issdue with these bikes, they are a nice neutral handler with good oomph, a few hundred on SS valves and you’re set for life.

BC

[GregMember]

Matt the steel valves from the TRX450 quad are a good fix, I am not a fan of spray type air filter oil, I would rather work it through the filter by hand I think its far better and use a filter skin helps also IMO

Greg Ball Engineering

Have yarn with Greg Ball he is very cheap and does very very good work, I have used him and recommended him to Austblue and LC4 here and they have both had work done by him and are happy I believe

TB

[PaulMember]

I have read many times of people using stainless steel valves to resolve the issue.
Not sure if there is a stand out good brand for them or not.

[GlennMember]

The Stainless Steel valves offer increased durability, but due to the extra weight of the steel a heavier valve spring is recommended. The harder SS valve will last longer but the SS valve is heavy the best cure is to use a better spring package with SS valves.

Glenn

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