Valuable Info on CRF valves..

My 02 valves lasted a whole season (1400 miles) with regular inspections, but the clearance on one intake closed up rapidly at the end. The 03, valves, head and springs all have the same part numbers, so you guys might want to read up too?

I had several long discussion with Kibblewhite, the only makers of Stainless steel valve kits so far. Without getting technical, They said all titanium valves are kind of soft, and the honda valve seats are kind of hard, while the springs are borderline too soft. This unhappy combination means the valves can sometimes bounce on the hard seats which accelerates wear.

I found two other companies that can supply SS valves (custom) at very reasonable prices, but neither of them knew about CRF's and had the appropriate spring kits. For now Kibblewhite is the only show in town. They are now selling only through distributors, the largest of which is web cam I think. They offer "white Diamond" valves with hard chrome stems right now, but will soon be shipping the "black Diamond" versions with some kind of hard black surface treatment.

They only sell the full spring kit for 4 valves, and say the exhaust springs are slightly stiffer as well. You can however only use the SS intakes with your stock exhaust, but you might as well use their SS exhaust too while your in there. I got prices of $32.00 per valve, and $185.00 for the full spring kit. All reports so far indicate that this completely solves the valve issues.

You do need to cut the valve seats before installing valves, and you can buy the neccesary carbide hand cutters from Neway Mfg. for a little under $200, or trust some shop to do it for you. These hand operated cutters are better than grinding stones, and are what 90% of all dealerships will use. I don't know what the going rate is for valve seat cutting, but I chose to buy the cutters. I am a Honda meechanic from way back, and won't let anyone touch my motors.

I ALWAYS freshen up the motor before each season no matter what I ride so none of this bothers me too much, but the cost was a bit high. The whole job with valves, springs, piston & rings, gaskets and the cutters cost me around $650.00

I'll forget all about it when I hit the trails this spring, and hopefully it will increase the resale value??

how about a group buy on this service. Is anyone interested in providing this service for TT members at a nice healthy discount.

I'd be interested in a group buy. Count me in.

Why do you have to cut the valve seats, the person I talk to at web cam said just lap the valves a little.

niagara power sports also sells valves specifically for the CRF. their # is (716)-791-4325 or on web at

I have one of his heads and I'm happy with it.


FHP - You might get away with lapping only, but you had to spend $300 for the parts plus gaskets and labor. Why skip this critical step? You don't positively have to change rings with a piston, or sprockets with a chain, or hone your cylinder for a new piston. All these things wear in sets, but you can sometimes get away with cutting corners. My daddy always had the perfect answer for stuff like that. "Don't confuse good luck with good practice" My intake valve seats were worn a little wider than specs, and a little rounded. The exhaust seats were pitted. I wouldn't have been able to sleep at night if I didn't cut the seats.

Gstar - Are the NPS valves Titanium or Steel, or Stainless steel. If stainless, or regular steel they will need new springs, and if Titanium, they won't be any harder than stock, and still should have stiffer springs. The stock light springs are part of the problem.

The Kibblewhite valves are also found in the new Parts Unlimited Parts Book for CRF 450's.

Woodsryder: you stated in previous thread (You can however only use the ss intakes with your stock exhaust)

If I put SS valves in my bike, I can't run a aftermarket pipe?

I can't run a aftermarket pipe?

He meant exhaust valves, not exhaust pipe.

I saw the valve kit in the Parts Unlimited book today at the Honda dealership. The price was $223, with my discount it would be $178 and no shipping. The valves were $33 sold individually. If I need them I will order through the dealership.

Dear Friends

While it is true that the Black Diamond valves and spring kit are in the new Parts Unlimited catalog ,as of wednesday they were not in stock and there was not an ETA.Cheers

One of the questions was "why cut the seats?"Because valves may be made to the same specs but they have manufacturing tolerances which even in KPM's case are tight,it still wanders.Not only is freshening up the seal(not misspelled) you're re-centering the sealing surface on the seat.It's called concentricity and is the relationship between the center axis of the valve stem and the valve seat.If it's off the seat angle will try to self center the valve causing the guide to wear faster and stem seal to fail.I set mine to no more than .001" concentricity and my valve jobs last a long time.It's also a case of while your there why not do the job.I have an '03 and hope not to have "the problem". :)

I put the SS valves in with the heavier spring kit not too long ago, without cutting the seats. I've been checking the valve clearance every 200 miles and each time I check, I'm losing .001. If I were to do it agian, and it looks like I will have to, I will cut the seats.

What is the parts number for the seat cutters?

You can get cutters from Neway MFG. 800 248-3889

CU270 60 degree cutter $58.00

CU232 30x45 degree double sided cutter $98.00

PMI4050 5 mm pilot $19.50

PMI4055 5.5mm pilot $19.50

TW505 Wrench $8.00

I got the #232 cutter with 1 3/8 body. This is borderline too big to clear the exhaust seat pockets, but I will clearance the cutter body to work. I wanted the largest cutter body for use with other vehicles. You may also be able to use the #230 body without any clearancing. it is only 1 1/4 dia. but the cutters will stick out farther. I won't know which is better until my valves come in and I try the cutters. Ask the salesman for a reccomendation.

I was told the black diamond intake valves will be shipping any day, but the distributors may still be selling the white diamond valves until stock is depleted. If you want the black ones, specify them. Unfortunately some distributors (Web-Cam) don't know the difference and think they are all black diamond. The exhaust valves are all white diamond right now, and the black ones won't be availiable for a few more weeks?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Kevin from Wiseco
      Jeremy Martin Leads the Charge for Wiseco Riders at Daytona Supercross
      Christian Craig Turns in Career Best in 450 Competition
      MENTOR, Ohio (March 13, 2018) – Jeremy Martin showed the way for Wiseco-sponsored riders in Saturday night’s Monster Energy Daytona Supercross presented by Honda. In a season marred by bad luck and misfortune, Martin put together a near flawless ride to earn his first Eastern Regional 250SX Class podium finish of the season.
      Martin qualified eighth for the division’s annual visit to the World Center of Racing, finished fourth in his heat race, and came home second in the 250SX main event, missing his first win of the year by less than a second.

      “It’s Daytona, a real man’s track.” said Martin who sits fourth in points. “It was the toughest race of the year as far as fitness. I had to slow down a little bit, halfway through the main. I was getting close to (race winner) Jordon (Smith) and I was starting to think about where I could make a move on him, then I made some mistakes and he got away from me. Couldn’t quite get close again, but it’s good. We’re on the podium and in contention for wins again. That’s something I haven’t been able to say in supercross in a while. We want to get wins and now we know it’s coming.”
      Martin’s podium was a bright spot, but the rest of the event was rough for the GEICO Honda/Factory Connection squad. RJ Hampshire crashed hard in his heat race and had to be transported to a local hospital. He injured his back and ribs, but shoulder pain left him with the most concern.
      “I felt good on the bike all day,” said Hampshire via his Instagram account. “Had some pretty good speed and my foot just slid off hitting my shifter in those rollers during that heat race. After seeing the pictures from the crash I’m very thankful I didn’t take a shot to my head. I have some fractures in my T3/T4 in my back and ribs. Also have some damage to my lungs which is why I’ll be spending a couple nights in the hospital. I’ll be getting some more checkups this week on the shoulder also.”
      Cameron McAdoo, the third member of the team, was unable to compete at Daytona after being sidelined with a hand injury two races ago in Atlanta.
      Across the paddock, in the premier 450SX Class, Christian Craig got the call to fill in for Team Honda HRC. With the team’s regular riders Ken Roczen and Cole Seely out with injuries, it was up to Craig to carry the load for the factory team, and the upstart rider didn’t disappoint.
      The San Diego native was solid in both qualifying sessions, won his heat race and snagged the holeshot in the division’s main event. After relinquishing the lead to eventual winner Justin Brayton, Craig continued to show he was up for the challenge. The 26-year-old rider raced for second and third for most of the 20-minute-plus-one-lap feature before losing one more spot in the late goings to bring his No. 32 Honda CRF450R home fourth in the final rundown.

      “I had a great week testing with the team,” commented Craig. “They came down to Florida right after Atlanta and I feel like we really improved. Just getting more time on the bike and getting more comfortable was huge. I started off race day feeling really good. My qualifying position didn’t really show it, but overall I was happy with my riding. It’s all about having fun out there, and man, that’s what I did tonight. I was up front in the heat race, fell to third, but then the two guys in front took each other out so I ended up winning. You can call it luck or whatever, but I just put myself in a good position to capitalize on people’s mistakes."
      “I had a good gate pick and some confidence going into the main. I grabbed the holeshot and led for almost the first lap, but [Justin] Brayton got by me pretty quick. I stayed second for quite a while. I just rode my hardest and did my best. Unfortunately, a couple guys got by me so I ended up fourth. The track was so tough. This is only my second time racing Daytona and last year didn’t go well, so I really wanted to get some revenge this year. It’s better than the week before, but man, I was so close to a podium. I just need to keep putting myself in good positions and work on getting better each weekend.”
      Monster Energy AMA Supercross rolls on this weekend when the series visits the “Gateway to the West” for its annual race at the Dome at America’s Center in St. Louis. The 11th of 17 races on the 2018 supercross calendar will be televised live on FS1 Saturday, March 17, beginning at 8 p.m. Eastern Daylight Time, 5 p.m. Pacific.

    • By desert520sx
      I have a 03 450 that I just got and it runs great! I love my bike and am big on preventative maintenance. I have searched the threads on TT and have not found any descriptive threads on how to check valve clearance or adjust them. Just by looking at them, I can see that the intakes need to be shimmed and the exhaust valves can be adjusted quite easily unless one needs to be adjusted differently than the other.
      I tried to do it last night, and lined up the marks on each side to get the piston to TDC to check adjustments and could not get any readings on tolerances on either the intake nor the exhaust. I moved the crank a little bit forward and got a .011 reading on the exhaust valves. I read in a thread that the spec was .011" for the left one and .014" in the right for the auto decompressor. The spec I am using for the intakes is .006" Are these specs correct? :excuseme:The only issue is that the adjustment for the exhaust valves is one and the same. Different from my KTM where you can adjust each valve individually.
      No matter where the cam was on the intake valves, I could not get any readings. Does anyone have a thread, website, downloadable manual, or article on checking and adjusting valves in these beasts?
    • By Eric Schrader
      I am selling my 2007 Honda CRF 450-R which is set up for desert racing (Track/desert). It has an 18" rear tire with a heavy duty setup (see description for details). The bike screams and has a Tokyo mods carb mod with the 10x ignition mapping (currently set to a handlebar switch for smooth power and max power). Gas tank is a 3.2 gallon IMS dry break tank. V4 steering stabilizer included. Precision Concepts suspention, Bike is set up for 6'4" 175lb rider. Zero oil leaks and well maintained using a preventative maintenance method with the best new parts each time. Receipts for all items can be provided. About 20 hours on the rebuilt head. Carb just rebuilt. Starts cold in just 2-3 kicks. 100% reliable bike as long as you turn the gas on.  Current CA Red sticker and original title.
      Expand above to see details
    • By bigg_stevee
      I recently replaced water pump and seal after I noticed that my '02 CRF450R was spilling coolant on easy trail rides. After the water pump swap (which was successful), I noticed the same problem. It's interesting - the bike only spits coolant (I mean a LOT of coolant) after passing anything above 1/2 throttle. The bike makes this weird 'gurgling' noise, like trying to suck through a straw when your glass is almost empty. This is weird because I properly bled/ burped the radiators with coolant, and filled them to normal operating levels. The coolant spills through overflow hose. 
      anyways - I swapped the radiator because I thought maybe the bike was running hot. I purchased oversized radiators, bought a 1.6 radiator cap (with a temp gauge) and bought engine ice. The bike runs very very cool - the temp gauge allows me to see this. Still, the bike shoots coolant out of the overflow after going above half throttle, making the same weird gurgling noise when it does. Bike has all of its power, top end was replaced not too long ago. 
      I'm lost and don't know what is wrong with the cooling system in my bike. How do I make the bike stop shooting out coolant, and stop making the weird gurgle noise??? Any advice would help me!!! Thank you!
    • By Mxer59
      I have a brand new Barnett Extra plate setup still in the box. It replaces the judder spring with a regular fiber. My old clutch had a judder spring break which wiped out the stock clutch. I was in a bind ordered this kit but it ended up coming 2 days later then it was suppose too. So now I don’t need it asking $180 SHIPPED 
      —“Complete Extra Plate Kit- consists of 8 Kevlar friction plates, 7 tempered steel plates and a set of springs. Provides maximum clutch capacity.”—