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Author Topic: What carbs ?  (Read 8415 times)

Offline NICKYBOY

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What carbs ?
« on: November 17, 2022, 01:04:09 PM »
Hi all.
Just bought a cb650 1981 in bits with no carbs. Seems like originals are hard to find and not the best anyway. Does anyone know what others fit. I've read that GPZ600 carbs fit, but all the ones i've looked at are spaced differently to my cb650. Ideas anyone ? Many thanks.
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Offline Bryanj

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Re: What carbs ?
« Reply #1 on: November 17, 2022, 01:16:12 PM »
There are two totally different sets of carbs fitted to the 650, doues the head have bolt on manifolds or cast in stubs?
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Offline NICKYBOY

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Re: What carbs ?
« Reply #2 on: November 17, 2022, 01:31:34 PM »
They're cast stubs
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Offline Oddjob

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Re: What carbs ?
« Reply #3 on: November 17, 2022, 01:44:13 PM »
Just sent a genuine Honda workshop manual to Ash the other day. All it really had in it was carbs and how to disassemble and assemble them, 650C IIRC. He'll put it on the site shortly, might be useful for you. Also had wiring diagrams in but not much else. Probably some sort of appendum for the main manual.
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Offline NICKYBOY

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Re: What carbs ?
« Reply #4 on: November 17, 2022, 02:56:55 PM »
Are the standard carbs CV carbs ?
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Offline SteveW

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Re: What carbs ?
« Reply #5 on: November 17, 2022, 04:35:48 PM »
79 and 80 Keihin PD50
81 on Keihin VB44A (CV carbs)

VB44 will not fit the earlier head as the spacing is different. I found this out to my cost  >:(

« Last Edit: November 17, 2022, 05:39:33 PM by SteveW »
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1974 CB550 K0 (with a 650 cam)
1980 CB650
2000 CBR929RR Fireblade
1966 Lambretta LI150 Series 3
1981 RD350LC
1972 Raleigh Chopper
1974 Raleigh Tomahawk
2011 Henry Hoover

Offline SteveW

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Re: What carbs ?
« Reply #6 on: November 17, 2022, 07:34:19 PM »
Check out www.murrayscarbs.com they have a kit that fits 2 Mikuni VM34’s with manifold adaptors straight on to a 650 head. All jetted and ready to go.

Expensive but they are supposed to be very good, there are some YouTube videos where they’ve been fitted to a 550 with very good results.
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1974 CB550 K0 (with a 650 cam)
1980 CB650
2000 CBR929RR Fireblade
1966 Lambretta LI150 Series 3
1981 RD350LC
1972 Raleigh Chopper
1974 Raleigh Tomahawk
2011 Henry Hoover

Offline NICKYBOY

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Re: What carbs ?
« Reply #7 on: November 23, 2022, 07:09:33 AM »
I may be interested in the carbs, so long as the spacing is correct, is it a cast stub head on the intake side ?
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Offline SteveW

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Re: What carbs ?
« Reply #8 on: November 26, 2022, 06:48:52 PM »
This is a pic of my VB44A 's which are for the later 650's.
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1974 CB550 K0 (with a 650 cam)
1980 CB650
2000 CBR929RR Fireblade
1966 Lambretta LI150 Series 3
1981 RD350LC
1972 Raleigh Chopper
1974 Raleigh Tomahawk
2011 Henry Hoover

Offline NICKYBOY

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Re: What carbs ?
« Reply #9 on: November 30, 2022, 07:58:10 AM »
Yes Davefirestorm. Do the slides slide and the butterfly's butterfly  ;). Would you want to sell them ?
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