2. After I take out the idle adjustment screw and open the orifice up with a .017 drill bit, then tickle the carb, the bike starts the first or second kick. Britbike forum member. The carbs are Amal Concentrics. TO SET AND ADJUST THE AMAL CARBURETTOR Having installed the engine as per our instruction manual, we would suggest you use the engine for 10 hours approximately, to allow for settling in and then, if necessary, proceed as follows: 1. The left side carb’s slow-speed jet is in the side behind the slow-speed adjusting screw. N. Joined: Apr 2008. Amal carburettors are famous for ease of operation and reliability. Bunbury, Western Australia. Part of the problem is many did not understand the Thermo-Quad and many were junked prematurely. While early models of this carburetor had brass floats, later versions came with plastic floats, which can become fuel-saturated after a couple of years. It happens for one or more of the following reasons:-(1) The flange nuts are overtightened during installation (2) The O-ring in the carb flange is too thick, causing the flange to bend when the nuts are tightened Get engine started and run for 2-3 minutes until warm. Reduce to idle. Posts: 42. Summary: This is basically a reprint of a shop poster produced by Norton Triumph in the 70's. N. Norton Neil OP. Unscrew the air screw and remove. Britbike forum member. Bunbury, Western Australia. behind this is the dreaded bush. This is a common problem in Amal carburettors, and has little to do with precision of manufacturing. AMAL Carburetter Hints and Tips How the Carburetter Works The carburetter proportions and atomises the right amount of petrol with the air that is drawn in by the engine because of the correct proportions of jet sizes and the main choke bore. This bush I have found is the main problem with this carb,and is probably blocked with crud. With the hole in the slide drilled out to accept the cable and the carb put together it's now time to mount it onto the inlet studs. The Concentric carb was deigned to be more compact, affordable, easier to tune, and more economical in terms of fuel economy as compared to the Amal Monobloc. Oh no, it's so badly cast that the carb only goes on 1/2 inch. The following articles and instructions are provided as general information for enthusiasts working with AMAL carbs on British Motorcycles, without the need for expensive tools or paying for expensive shop labour. OP. I have a 49 BSA M20 with an AMAL 276 carb. Now, I have been reading on various other 'Classic Bike' websites and forums that quite a few people are having various problems with their 'New' AMAL Monobloc carbs, either continually flooding or fuel not getting through. With a Thermo-Quad, the float levels must be set exactly to specifications. The carburettors were made in many sizes but only two basic designs, the "monobloc" and the "concentric. Amal Concentrics, How they Work and Tuning . On examination the casting is slightly different to the old Amal so the mounting holes don't quite line up. Posts: 42. The carb itself is squeeky clean and shows no obvious signs of any problems or muck in any jets or filters. Joined: Apr 2008. The Amal Concentric had a new “simple” measuring range offered in metric sizes (26, 28, 30, 32, etc) The carb will either have a pilot jet or bush, if it has a brass jet the carb is old or a two-stroke version, as these were changed in 1967-8 to a pilot bush.for four-strokes. The Carburetor and part numbers: 1 Cable Adjuster (4/035) 2 Cable Adjuster Locknut (5/077) 3 Mixing Chamber Top (928/064) 4 Air Valve Guide Tube(928/103) In 1967 Amal released a new carburetor called the "Concentric". Amal carburettors are found on nearly every English-made motorcycle since 1927. Norton Neil. 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