Amal 389 Dilemma

what model and year is the machine

 

Hi Stephen as you say it should have Amal 389/203 carbs with the internal bore 11/8th - main jet 376/100-260 - pilot jet 376/076-20 - needle jet376/072-106 and needle position 3 - throttle valve 389/0603, it looks as though it could be 376 carbs, although I can't be sure, the best bet would be to measure the carb internal bore to narrow it down further. The trouble is unless your friend bought it new then previous owners change all sorts of parts, often from other makes. A 1956 T100 uses the same carb as a BSA 500 A7, it just utilises different internals. I have looked in my archives for Amal and am unable to see anything with the prefix K33, I will have a look through some other reference information later next week and update you on anything I find.

 

Hi Stephen, if the machine is a 1964 then the correct carbs should be the 389/203 with the jets etc as I mentioned, the 930s were fitted to a range of models such as the TR6 - TR6R - TR6C - TR6 Police and fitted between 1968 and 1973, they were also fitted to the T120 - T120R - T120V from 1967 to 1973, they were also fitted to the T140V - T140D - T140E from 1973 to 1978 - Les Harris also fitted them to his Bonneville's from 1985 to 1987, all had the same internal bore of 30mm but obviously different jets etc. The 930s would not have been fitted as standard when new on the 1964 they came later on. It's a good job your mate has a good knowledgeable friend like yourself otherwise it sounds like he may struggle a bit. I will let you know re the K33 carbs as soon as I can. Let the forum know how you get on.

 

Hi Stephen, sorry it has taken so long to get to the bottom of your carb issue, however here is some information that may shed light on your carbs. The carburettors on your bike were made by Grosvenor Works, the company that owned Amal before Burlen. They didn’t stamp the carburettors with specification numbers as the carbs were sold into the trade and jetted by individual dealers. It is safe to say the supplying dealer stamped the carbs hence the strange numbers. Amal can supply the correct carbs if you wish to go down that route, although a pair will not be cheap. I hope this helps you.