1937 AJS 250

Information relating to Matchless and AJS Models built prior to 1939
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1937 AJS 250

Postby NORMAN NIPPY » Sun Aug 09, 2020 6:07 pm

l was out on the bike for about 2 hours, when I touched the carb body it was very hot. Should there be a thick fibre
gasket between carb and engine
Thanks

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Re: 1937 AJS 250

Postby Rob Harknett » Mon Aug 10, 2020 9:57 am

Just a normal paper gasket. You should notice the stud's are not long enough to take a spacer

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Re: 1937 AJS 250

Postby NORMAN NIPPY » Mon Aug 10, 2020 3:50 pm

Thanks again for your reply

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Re: 1937 AJS 250

Postby griffin » Mon Aug 10, 2020 7:58 pm

Norman did you check the carb immediately after a run and killing the engine or was 5 minutes later ? I would have thought the carb would be fairly cool with a vacuum and vaporised fuel .

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Re: 1937 AJS 250

Postby Duncan » Mon Aug 10, 2020 8:58 pm

Pre-monobloc's do run hot and rely on the fibre washers on the float chamber for insulating the fuel, if you look at early post war singles they had an alloy extension/spacer on the head until the monobloc was introduced when they went to a Tufnell/insulating spacer

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Re: 1937 AJS 250

Postby ajsimpson » Tue Aug 11, 2020 12:59 pm

Hi Norman

I have the same bike 37/22 and the carb does run very hot, i've not experienced any problems through it though. What fuel do you use just out of interest? (not that that is anything to do with it)
I have just filled up with super unleaded after reading on here that it helps reduce pinking..... Save your money, it doesn't 😆😆😆

Andy

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Re: 1937 AJS 250

Postby Rob Harknett » Tue Aug 11, 2020 2:35 pm

Remember, 1936 fuel was about 76 octane. It would not need high octane fuel to stop it pinking, unless you have fitted a very high comp. piston. The engine is more like an old tractor engine farmers would start on petrol then switch to paraffin.. During the 1950's petrol rationing I tried running my 37/26 on paraffin. It needed petrol to start it and warm it up first. It did not go very fast, I never went very far as it was making so much smoke.

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Re: 1937 AJS 250

Postby Stan Palmer » Tue Aug 11, 2020 2:51 pm

My Dad used to run his 1200 Indian on such a mixture. I remember sitting in the sidecar with the other 4 kids and seeing the cylinders glowing red. He used to complain that it melted his wellies. But we had transport at a time most didn’t.
Stan

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