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General => General Douglas Discussion => Topic started by: alan reid on 10 Feb 2021 at 20:44

Title: 1930 Douglas T6 throttle needle length
Post by: alan reid on 10 Feb 2021 at 20:44

I am trying to find out the correct length of the Amal 5/116/s  carb Throttle needle. I have found out you can shorten a 5/065 needle, but to what length?
The T/S6 both used this carb, could anybody out there let me know the correct Throttle needle length, none of the carb people seem to know.

Thanks Alan.

Title: Re: 1930 Douglas T6 throttle needle length
Post by: yosemite on 11 Feb 2021 at 01:12

Dont know if this is of any use
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjfmt7v3-DuAhX7VBUIHTH9D4gQFjAAegQIAhAC&url=https%3A%2F%2Fwww.andybuysbikes.com%2Fimages%2FTech.%2520Info.%2520page%2FCarburettors%2FAmal%2520Carburettor%2520Needle%2520Information.pdf&usg=AOvVaw0FIhTEDBqPPGIuUqzseVzD
hope the link works

Title: Re: 1930 Douglas T6 throttle needle length
Post by: Doug on 11 Feb 2021 at 01:38

I ran into the same problem.

(https://www.douglasmotorcycles.net/aa-files/images/doug/2021/5-135-needle/5-135-1000px.jpg)

Full size JPEG (https://www.douglasmotorcycles.net/aa-files/images/doug/2021/5-135-needle/5-135-fullsize.jpg)
Full size PDF (https://www.douglasmotorcycles.net/aa-files/images/doug/2021/5-135-needle/5-135.pdf)

-Doug

Title: Re: 1930 Douglas T6 throttle needle length
Post by: alan reid on 11 Feb 2021 at 12:53

Hi Doug. Many thanks for your reply.
Did you shorten a 5/056 needle or make a complete new one?

Regards Alan Reid

Title: Re: 1930 Douglas T6 throttle needle length
Post by: Doug on 11 Feb 2021 at 14:04

Alan,

Neither. I been meaning to get back to the project for fifteen years! A friend in the UK supplied me with a Type 5 needle, and the plan is to alter that. I made the drawing because someone else was looking for the same info ten year back.

-Doug

Title: Re: 1930 Douglas T6 throttle needle length
Post by: alan reid on 11 Feb 2021 at 15:45

Doug, I will cut down  5/065 needle to your dimensions and try it.
The only concern i have is that I will be cutting off about 5/16" off the needle taper! won't that make it run very weak?
I will let you know.

Alan

Title: Re: 1930 Douglas T6 throttle needle length
Post by: Chris on 11 Feb 2021 at 16:52

Hi Alan
I had a batch of needles made for S6 using the drawing (above) supplied by Doug. These went into LDMCC Spares scheme. If they are no longer available I think that Martyn Bratby also has a stock. Regards  Chris.

Title: Re: 1930 Douglas T6 throttle needle length
Post by: alan reid on 15 Feb 2021 at 15:25

Thanks Chris,
The LDMCC have the needles in stock and I have one in the post at the moment.
Thanks everyone for all your help.
Alan