Pro X Steel Intake Valve/Spring Kit

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Product Details
Customer Reviews
Videos (4)

21-4N Stainless Steel Valves for increased durability and less wear under extreme conditions.
Black Nitrided valves offer high microhardness while supersmooth surface finish reduces friction between stem and guide.
Special designed valve springs deal with the extra weight of the Stainless Steel valves.
Springs are made from premium Chrome Vanadium Steel for higher performance and durability at high rpm.
Fully rebuildable utilizing your OEM retainers, bases and seals without the need of any further engine modifications.
Comes as complete package of all intake valves and springs.

Pro X Steel Intake Valve/Spring Kit Reviews

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Displaying 9 of 9 reviews

0 of 0 people found this review helpful.

Great Valves

Loran in Alaska – Machine this part was bought for: 2007 YAMAHA YZ250F

Comments On Jun 11, 2013:These valves are great. When I rebuilt my bike I redid my head (cut the valve seat) and then installed these Pro-X steel exhaust and intake valve kits with new seals. Bike started in 2 kicks and has been going strong since. It's been about 3 months and I've been racing nonstop since then with no problems. Still starts in about 2 kicks, and I haven't even had to re-shim them.

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intake valves

ANTHONY in UT

Comments On Feb 12, 2013:great valves, much better than original

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Great Valves

Tyler in CA – Machine this part was bought for: 2004 HONDA CRF250R

Comments On Jan 06, 2013:Put these in. Noticed a small power loss but hopefully they last longer than the oem valves.

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0 of 0 people found this review helpful.

valves n springs

craig in IL

Comments On Sep 04, 2012:for ss valves and springs how can u go wrong

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0 of 0 people found this review helpful.

Me Likey!

Paul in CO

Comments On Apr 22, 2012:Have had great luck with the steel valves, I have not had to adjust them in over a year, and I don't notice any power loss.

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0 of 0 people found this review helpful.

great product

Justin in KS

Comments On Mar 20, 2012:baught a set of these for my CRF250. installed them myself was super easy and best of all i ddidn't have to take the head to the shop to have the valves seated.

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Fixes Honda valve problem

Brian in PA

Comments On Feb 21, 2012:Wish I would have switched to these years ago! I can't feel any power loss whatsoever, and I ride Vet Expert. And you may not need to cut seats, I've replaced valves like 5 times in this bike. I had them cut for the first time before my last set of OEM valves and they didn't last any longer. I just swapped these in with no issues.

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1 of 2 people found this review helpful.

Better than stock Ti

Cameron in QLD

Comments On Aug 09, 2011:These valves were that close to factory spec that after I lapped them in, the stock shims were re-used and come on recommended clearance. Excellent valve for the money.

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