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CB750 Slide Carbs on a CB 350K

ashimotoK0

Veteran Member
Joined
Jun 7, 2020
Total Posts
119
Total likes
8
Location
East Yorkshire UK
Some time ago I bought a pair of CB750 SOHC carbs that had been modified to fit on a CB350K4 race bike.

Anyone on here got experience of this please?
 
No experience, but I'm interested.

Are these the early round slide carbs with a separate cable for each slide? (I think the throttle cable split four ways on those models, but later the carbs included a throttle linkage across the four bodies.)
 
If they are the K0 carbs I'm sure they'd work just fine since they're 28mm, but they will also be hard to find and expensive when you do.
 
No experience, but I'm interested.

Are these the early round slide carbs with a separate cable for each slide? (I think the throttle cable split four ways on those models, but later the carbs included a throttle linkage across the four bodies.)
I think they off a K2 with bar linked carbs but the PO has made brass fixings to make them cable operated. I must dig them out and see what size jets etc he fitted and needle position. I do have a set of K0 carbs bt they are for my 8/69 CB750 diecast.

Interesting note : the guy who sold me the carbs also sold me another set painted silver. Turned out these had been removed from the 'Gold 'Brighton Bike' CB750 pre-prod prototype but Lord Denbigh, the UK buyer in '69, wanted the production carbs fitted plus low- UK style handle-bars.. I offered the carbs to the guy who bought the Brighton bike at auction in the UK for a staggering £161k (inc. premiums,tax, etc) but he wasn't interested ...so I gave them away free to my mate Chris who is a sandcast guru in the UK. I showed the carbs to the top USA CB750 sandcast man (Vic World) when he was in the UK and he immediately confirmed they were the real deal. Turns out Honda fitted CL77 carbs painted silver to those four pre-production prototypes.
 
Are you interested in using them on a 350 twin? I'd be interested in seeing a picture or two of the arrangement and modifications.

How different would this be from the stock SL350 carbs?
 
How different would this be from the stock SL350 carbs?

The stock SL350K0 carbs are the same as CB/CL carbs only black in color, 28mm CV style. The SL350K1 carbs are 24mm slide carbs for the broader powerband of the K1 camshaft and smaller intake ports, so the 28mm slide carbs from the 750 would work roughly the same as the stock CB/CL carbs except that you could stall it by whacking the throttle open too hard.
 
The stock SL350K0 carbs are the same as CB/CL carbs only black in color, 28mm CV style. The SL350K1 carbs are 24mm slide carbs for the broader powerband of the K1 camshaft and smaller intake ports, so the 28mm slide carbs from the 750 would work roughly the same as the stock CB/CL carbs except that you could stall it by whacking the throttle open too hard.
Thanks, Tom. I didn't realize the SL350K0 used CV carbs. So, I guess the repurposed 750 carbs are larger than the 24mm slide carbs on the SL350K1, which would make sense for racing.
 
Thanks, Tom. I didn't realize the SL350K0 used CV carbs. So, I guess the repurposed 750 carbs are larger than the 24mm slide carbs on the SL350K1, which would make sense for racing.

Yes, the first year SL350 was a CB/CL frame painted silver with a loop in the rear for the rear fender top mount and upswept low pipes, weighed basically the same as a CB or CL. No differences in the engine or fuel systems.
 
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