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Author Topic: 500 four refresh  (Read 1164 times)

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Offline Jinglyjangly

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500 four refresh
« on: August 12, 2015, 09:32:23 AM »
I have a 72 500 four racebike, engine/carbs standard, thinking on some light tuning.
I have a set of keihin cr29's which I bought for a rickman cr750 project but ain't done anything
With them , are they ok with ported 500 head? Or should I buy  cr26's ?
Will put in new camshaft and Pistons - any suggestions, ain't got a big budget.
The front end which is on the bike is going to another project , any suggestions on which one
Works well at reasonable cost, the bike will probably be raced on irish roads so it will need to
Be upto 1972. (I think)
Thanks in advance your assistance in getting this bike back on track appreciated, btw I'm not daft
Enough to race on Irish Roads its a pal who will be the pilot.
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2 x cb350-four honda 500-4 race bike
rickman cb750 1 x rc163 replica, 2 x cbr250r yamaha tzr250 yamaha tz350
yamaha trx850 yamaha rd500 suzuki gt250 suzuki gt500 plus Norton's, Triumphs,Velocette's and BSA's

Plus bunch of Brits, Velo's, Triumphs Norton, AJS and others

Offline triple

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Re: 500 four refresh
« Reply #1 on: August 14, 2015, 12:08:25 AM »
I think you should dispose of the CR29,s . . . . . . so much in fact I am willing to purchase them from you
this should help with funds for your project ???
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Offline DMcD

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Re: 500 four refresh
« Reply #2 on: August 14, 2015, 08:16:31 AM »
Second refusal on the '29's, for my 550/605 and I'll keep them in Ireland ;-)

Oops, edited as I see you are in Scotland.  (I am a McDonald though)
« Last Edit: August 14, 2015, 08:30:54 AM by DMcD »
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Offline Tim2005

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Re: 500 four refresh
« Reply #3 on: August 14, 2015, 01:32:52 PM »
I think 29s would be a good size for a 500 racebike, CR26s are good on a road 460/4 and the 584cc Luke Chures 400Fs ran 31mm Keihins very successfully.
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Offline triple

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Re: 500 four refresh
« Reply #4 on: August 14, 2015, 07:21:01 PM »
correct. the 29,s will work fine IF you have the rest of the motor prepped to accept the carbs ( head work , induction porting / matching etc )
we use 29,s then set them up for methanol on our 500 / 4,s

good luck with your build.

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