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Villiers midget carb query

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Plasma25/01/2020 21:45:09
350 forum posts
43 photos

Hi gents,

I'm.currently renovating a 1947 Allen Oxford powered scythe, which has a Villiers 11c engine.

The carburettor has a male threaded fuel inlet rather than a female thread and banjo.

Does anyone have an idea of the thread, its 26 tpi so I'm hoping its gas thread.

Regards

Mick

old mart25/01/2020 21:54:44
1075 forum posts
109 photos

26 tpi is a very common pitch, used for many BSC (British Standard Cycle) threads of varying diameters. 1/4 BSF is also 26tpi.

Motalia have printable charts which you can download to check. There is also the possibility that it is a Villiers carburettor proprietary size.

**LINK**

Edited By old mart on 25/01/2020 21:58:20

Howard Lewis26/01/2020 14:40:31
2699 forum posts
2 photos

There is no British Standard Pipe thread with a 26 tpi pitch.. 1/8 BSP is 28 tpi. Above 1/8 it goes to 19 tpi and then to 14 and then 11 tpi.

If the thread form is 60 degrees, it will be British Cycle thread.

There are no Unified Coarse or Fine with 26 tpi pitches. And, given the age, a Unified thread would be unlikely.

If the form is 55 degrees, it may well be British Standard Brass, Only 1/4 BSF is 26 tpi

What is the OD? Presumably, given the age, Imperial.

Howard

Plasma30/01/2020 18:57:50
350 forum posts
43 photos

Hi all, OD is about half inch. The guy at villiers parts says no one he knows has ever identified the thread. Luckily he had a nut and nipple to suit so I bought that and we are up and running now.

Many thanks for the comments.

Mick

old mart30/01/2020 19:36:22
1075 forum posts
109 photos

I had an Atco mower with a Villiers midget engine, and when it fell to bits, the carburettor got put on one of those sixties mopeds with the two speed gearbox. I can't remember the make, but it did 35 mph after the mod.

CHARLES lipscombe30/01/2020 20:32:56
102 forum posts
8 photos

Villiers were quite keen users of their own thread forms. Their later, larger carburetters incorporate a whole range of different standard threads e.g. BSF, BA, BSC as well as their own threads.

Chas

Hopper30/01/2020 22:46:28
avatar
3944 forum posts
83 photos

Could be British Brass Thread. 26tpi all diameters. 55 deg form.

Howard Lewis31/01/2020 11:57:48
2699 forum posts
2 photos

The main thing is that you are up and running.

But it would have been interesting to know what the thread is. (You never know, you may need the info at some time in the future! )

Howard

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