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RHC Valves?

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After 2nd set of stock intake valves and new springs lasted about 6 rides I want to install Ron's intake valves and springs.

Do I just lap the new valves or should I have the seats cut?

When I put in the 2nd stock set the shims were on the small side (1.40) with not much room for shimming. Does anyone know if Ron's vales are shorter than stock to allow for cutting the seats?

Now the big Question, How do I buy these valves and springs?

Ron's site doesn't show how. I e-mailed him and called. I'm sure he's very busy and I don't want to bother him.

Thanks for any info, I need to get this thing fixed!!

Buz

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I just finished installing my RHC intake valves and springs this weekends. My seats looked like they were new from Honda so i just lapped them in and did the wd40 or brake clean test to make sure they seated and were not leaking.

As far as the length goes i actually think they may be a tad longer than the stock stems as i had original shim of 170 and 175, but with the new SS RHC valves i had to use 142.5mm shims on both intake valves.

As far as ordering goes, just call till you get him. Really nice guy to talk with. I forget prices, but hte vavles were actually cheaper than the Kibble White valves and the spring kit was arounf $180.00 if i recall correctly.

I just cleaned up my OEM exhaust vavles and lapped them in. I used RHC springs and retaines like the Intake Side of things. Havn't ridden her yet to see how my mechanic work was, but i hope to later this week.

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Can you order from Ferrea? I don't even see a phone number on their web site.

I'm now worried that they may be to long to get a shim under. I know the KW are a little shorter. I also know that KW now have a stonger spring kit. I'm just afraid if I order a set that I will get the old spring kit.

I read a post that the TTstore was not aware of the new spring kit.

Any thoughts?

Buz

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Exact reason why i went with RHC spring kit, TT and other vendors seemed to not know about the new spring kits that KB tech support told me about. I wouldn't worry about the shim issue as far as getting a small enough one. If you can't get the smallest one in to fix the problem then your seats have got to be bad. I will be using 1.425mm and the shims go all the way down to 1.20mm which i beleive is .009 looser than what i am installing.

CRF Shim Size list

14901-MBB-000 .0472in 1.20mm

14902-MBB-000 .0482in 1.225mm

14903-MBB-000 .0492in 1.25mm

14904-MBB-000 .0502in 1.275mm

14905-MBB-000 .0512in 1.30mm

14906-MBB-000 .0522in 1.325mm

14907-MBB-000 .0531in 1.35mm

14908-MBB-000 .0541in 1.375mm

14909-MBB-000 .0551in 1.40mm

14910-MBB-000 .0561in 1.425mm

14911-MBB-000 .0571in 1.45mm

14912-MBB-000 .0581in 1.475mm

14913-MBB-000 .0591in 1.50mm

14914-MBB-000 .0600in 1.525mm

14915-MBB-000 .0610in 1.55mm

14916-MBB-000 .0620in 1.575mm

14917-MBB-000 .0630in 1.60mm

14918-MBB-000 .0640in 1.625mm

14919-MBB-000 .0650in 1.65mm

14920-MBB-000 .0659in 1.675mm

14921-MBB-000 .0669in 1.70mm

14922-MBB-000 .0679in 1.725mm

14923-MBB-000 .0689in 1.75mm

14924-MBB-000 .0699in 1.775mm

14925-MBB-000 .0709in 1.80mm

14926-MBB-000 .0719in 1.825mm

14927-MBB-000 .0728in 1.85mm

14928-MBB-000 .0738in 1.875mm

14929-MBB-000 .0748in 1.90mm

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I know the KW are a little shorter. I also know that KW now have a stonger spring kit. I'm just afraid if I order a set that I will get the old spring kit.

I read a post that the TTstore was not aware of the new spring kit.

Any thoughts?

Buz

From Mike Perry at Kibblewhite (KPMI) :

If the spring kit is going to be installed in a bike that has not been heavily modified, (which is the case most of the time) then the current KPMI Kit #30-30190 is the answer.

If a KPMI spring kit is going in a bike that is heavily modified and being raced on a regular basis by a rider who is consistently running the bike in the upper RPM range, then the new KPMI Kit# 30-30470 will be mandatory.

FWIW, we do a lot of KPMI kits on the CRF450s and on 95% of them we use the original KPMI Kit #30-30190 with outstanding results. Dirt trackers running on 1/2 miles and SuperMoto riders running big fast tracks are the only guys we have found to need the heavier spring kits.

I'm not sure what options Ron has for springs but if you go in that direction I would suggest going direct to Ron rather than through Ferrea so you get the benefit of Ron's expertise.

I hope this helps.

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Hello Mr. Rohrich,

You say you end up using the lighter springs most of the time. I am wondering why not just use the heavier springs universally. Just what are the pros and cons of the heavier vs lighter spring sets?

Thanks,

xxXXDeathXXxx

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Thanks Rich,

Mike P. made it sound like they weren't even makeing the original set of springs any more. My concern was that a lot of stock must still be out there.

Can I use the stronger springs just to be safe. I'd like to do what I can to make these things last longer.

Thanks Again!

Buz

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Ferrea is who is making the new spring kits for Ron. Get in touch with Ron like Rich said and he will get you hooked up. They had some problems with the double spring failing under mx conditions.

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Ron called me back,and I ordered a set of his intake valves and spring kit. Sounds similar to KW, he's tried to improve on the longevity. I think I'm getting the best possible spring kit. I feel Ron is realy trying to help us out. I hope he's done it,only time will tell.

Later

Buz

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