Carb fitment confirmation

jseng1 · Sep 17, 2020

Looking for someone to confirm the fit of these carbs with newly designed manifolds and throttle bracket. (I only have a featherbed).

CRS 33mm smoothbores with manifolds, boots, throttle & cable.

Brooking 850 · Sep 18, 2020

Ill try them for Jim !!!

Bernhard · Sep 18, 2020

Aren't these CR s racing carbies?
Is the pilot jets omitted,?

Fast Eddie · Sep 18, 2020

Bernhard said:
Aren't these CR s racing carbies?
Is the pilot jets omitted,?

No, they have fully functioning pilot jets.

Brooking 850 · Sep 18, 2020

Are you running aset Nigel, if so any good ?
Regards Mike

Fast Eddie · Sep 19, 2020

No I’m running the FCR flat slides from Matt.

I have run round slide CRs before on a Triumph triple and they’re good carbs.

Both versions have pilot jets (to answer Bernhard’s question) and throttle stop adjustment. The CR is an earlier generation product (hence is popular in classic racing) but the FCR is a better performance instrument (evident from the flat sidles and accelerator pumps).

Good to have the choice though... yer pays yer money...

Brooking 850 · Sep 20, 2020

Thanks

gortnipper · Sep 20, 2020

Im up for it!

Hortons Norton · Sep 20, 2020

Nice carbs, I have heard good things about them. Are air filters available for these with this setup? And how do they compare to the flat slides price wise?

jseng1 · Sep 20, 2020

Yes K&N has an airfilter that fits and they are not as expensive as the flat slides.

Thanks Gortnipper but I think I've found someone in Calif who has all the various tanks to check fitment.

Schwany · Sep 22, 2020

Was wondering if these could be made to work. I'd have to make manifolds for the P11 unless you made some for your featherbed that you are also planning to sell.

Did you ever make manifolds for your bike? I'd buy this set up for a straight up 750 in a heartbeat.

If this is a product you are planning to sell, when will it be available?

Getting to that idle air circuit adjustment screw looks like loads of fun, but having used larger versions of these on inline 4's I know they work, and work very well.

jseng1 · Sep 22, 2020

Schwany said:
Was wondering if these could be made to work. I'd have to make manifolds for the P11 unless you made some for your featherbed that you are also planning to sell.

Did you ever make manifolds for your bike? I'd buy this set up for a straight up 750 in a heartbeat.

If this is a product you are planning to sell, when will it be available?

Getting to that idle air circuit adjustment screw looks like loads of fun, but having used larger versions of these on inline 4's I know they work, and work very well.

I've mounted them to my Atlas no problem. You can get straight manifolds from Wassell or Steve Maney. Idle mix screw access is easy. Idle speed screw is accessable with a wrench. Carbs should be available in a couple weeks.

I've changed the design since the video below by relocating a new throttle wheel to the right side.

Schwany · Sep 22, 2020

Thanks for the response Jim.

I'll drop you an email later if it all looks like I can get the setup under my tank without any clearance issues using straight manifolds.

Edit: Oops, should have looked at the video first. Looks like the straight manifolds could work.

jseng1 · Oct 10, 2020

After mocking them up with some help from Michael it looks like they will fit all Commandos - but Roadster tanks should be fitted with BAP or Paioli petcocks to get more clearance. Either that or the tank should be shifted forward for stock petcocks (loosen mounts, move forward and retighten).

Photo of roadster tank with Paioli petcock and tank in normal position.

Photo of stock petcock with tank moved forward to gain clearance.

Interstate tanks will fit and have enough clearance with stock petcocks and 4 tank mount rubbers on each side. Hi riders fit and have enough clearance with stock petcocks.

So now I'm looking for BAP or Paioli style petcocks that come with barbs for the hoses.

Carb fitment confirmation

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