Just realize, all gasoline the engine burns goes through the main jet on that carburetor. No other way for fuel to get to the idle circuit at low speeds or main nozzle at higher speeds. So, if you turn the main adjusting screw all the way in and it does not kill the engine that means the needle is not going into the main jet and closing it off. There are different length needles that came with power inprovement packages and the fire crater package had a different taper on the jet and needle so now days there are all sorts of combinations out there. Just turn main needle in with engine warmed up, full throttle until it starts to lean out and back it out about half turn for starting point. Also, many M's have a calibrated main jet just like later models so turning it out twenty turns will not increase fuel flow above what about 4 turns will.
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Today's Featured Article - Torque Wrenches - by Curtis Von Fange. When working with fasteners a torque wrench can play an important role in the correct assembly of critical equipment components. Lets examine in detail some of the reasons for using a torque wrench along with how to correctly use the variety of wrenches available. Applying the proper torque to a fastener accomplishes a number of tasks. First of all correct torque will hold the parts together. This may seem like a trite statement but � think about it for a second. Engineers have designed
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