Bike carbs or twin 40's??

Pierburg downdraught.








Or bike carbs.

32s will be a bit small for flowing 150bhp (or at least they would be on a bike - they'd generally be on 80ish BHP 600s) - you want 36s really if you're aiming for that sort of figure.

I'd go bike carbs, just 'cos they are cheap and easy to set up!

i say 40s too, as has been said, i think you will be pushed to flow 150hp through 32s.

lots more support around for 40s; and any pretty much any rolling road has the stock and ability to set them up properly for you (although, i don't know what bike carbs are like to jet; does everywhere stock the jets for Keihin's? i had heard that some bike carbs used the same jets as some webers.)

i was tempted to go bike carbs on the kitten; but the cost of the manifold made it pointless; its never gonna be fast, and twin SUs will provide an ample hike in power and be 100x cheaper for my aplication with added period looks bonus's.

if i was to be replacing the 40dcnf's on the ss1, i would go injection and throttle bodies instead of 45s or bike carbs.

Weber DGV jets fit Keihins - well fit my R1 carbs anyway.

Don't know what a standard kitten manifold looks like or costs but if cheap and the right ballpark shape, could you cut and grind a standard manifold about so you end up with 4 stub tubes at the inlet to which you attach the bike carbs by fuel-proof rubber hose?

Forgot to mention, any half-decent bike dealer will have bike carb jets in, they're generally about £2 each (or at least they are at my local places!). Just be careful not to mix and match hex and round jets - IIRC they have different numbering systems...

www.wemoto.com sell them if you're happier ordering from the armchair

I need to establish if these are 32s or 38s ... I suspect they are 32s .. as they are the only Keihin CVR carbs I can find..

CR500Dom knows... I had it written down somewhere, but now cant find the note (Doh! Analogue technology).

Bike carbs do seem to be the obvious answer... its what i'm planning to fit on the Derby.... they are cheap & seemingly easy to fit & set-up - the next best thing to TBs.

40s on the other hand do look ten times better.... especially on a classic engine.. sometimes it seems the 'right' thing to do even though they'll cost more & be more troublesome to set-up & keep in tune?

One thing I have heard that has put me off a bit - is that with bike carbs sometimes you get a 'cough back' where petrol is spat back out the inlets - which if your exhaust is hot can (& has caught fire) I'm guessing fitting sock filters or even fabing up an air box would eliminate
this problem - & is probably a risk with any open inlet fueling system?

BTW Hotwire - you have a PM

The specs for the R6 carb have it written as : Keihin CVRD37 with TPS system. Whats a TPS system? Not a TLA I've come across before... only TPS I know is this one

^^^^
What he said ;D