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Series MM Twin H1 Carbs

Posted: Sat Oct 03, 2020 6:06 pm
by Potts
I've recently taken on my recently passed uncle's Mk1 Midget (948cc). Among his bundle of parts is a pair of fully serviced SU H1 carb's (receipt shows the service cost him £214). The Mk1 Midget has HS2s, so I've been trying to figure-out why he had these ready for fitting. I've learned that the 948cc MK1 Sprite had twin H1s, so it's possible that he simply thought they'd be fine on his Mk1 Midget. The chap now restoring the car's original HS2s said that these H1s would not have been suitable for the Sprite/Midget, as the float chambers are horizontal (0 deg - Spridgets should be 20 deg) and they also have an unusual/custom inlet manifold. After a few days contacting his fellow carb restoration pals, they have collectively suggested that these H1s were probably made for the Series MM sidevalve engine. Having since looked at a few MM sidevalve engines with twin H1s, some have them mounted slightly different to my setup, though I've also seen examples where they're mounted the same. Could they even be split to make two separate Series MM H1 single carbs?

I want to sell the H1s and it would be easy just to list them on eBay. However, I'd like them to go to the appropriate ownership/appropriate vehicle, as they seem to be quite a rare item.

I'm looking to to recover my uncle's cost of servicing (£214), plus something for the carbs.

£400 (Happy to discuss)

Re: Series MM Twin H1 Carbs

Posted: Sun Oct 04, 2020 11:25 am
by alanworland
Quite a find!
I bought a pair of (I was told) Sprite H1's years ago for my sidevalve and they had the angled floatchambers consequently I made up a pair of independent manifolds to support them at the correct angle.
I think I had a bit of a post going at the time, a few years ago.


Re: Series MM Twin H1 Carbs

Posted: Sun Oct 04, 2020 6:03 pm
by Potts
Thank you Alan. That's very impressive to have manufactured a manifold to correct the Sprite float chamber angle!

I guess they're quite niche, so may take a while to sell, though Happy to negotiate when anyone's interested.

Best wishes,

Re: Series MM Twin H1 Carbs

Posted: Wed Oct 07, 2020 8:58 pm
by sparesman
I dont think they are MM as both end flanges of the body ,where the filter attaches and where as individual carbs they fit to the manifold , are different shapes to the MM carb. They look more like Series 11 carb flanges. Also the brass choke levers are wrong. They were possibly made up from a SU carb parts bin for a specific purpose.
If you add a photo of the manifold taken from the engine side with dimensions between mounting holes and of the bore it might help identify it.

Re: Series MM Twin H1 Carbs

Posted: Sun Oct 25, 2020 4:24 pm
by RobThomas