Ok, lets dispel the 441 myths right this moment. If properly set up, it should start first kick, hot or cold, without fail. First, you need to know the correct starting procedure. Turn on the fuel petcock. Depress the little plunger on the carb body for a couple of seconds. Slowly kick down on the KS lever until it is "on compression". There will be no doubt when this is. Release the lever and let it return to the top. Pull the compression release, and slowly push the KS lever about 1/2 way down. Let the lever return top the top. Switch on the key, and give a full bodied kick down, and it should chuff into life. Note, they are mechanically noisy when running. The fins ring, you can hear the valve train. Do not be alarmed. Do listen for bottom end noise though. The 441 has a roller bearing bottom end. They usually last a long time, but they are hard to fix. Have the mechanic inspect the slide in the carb. The wear is apparent from the back side, ie, nearest the engine. If there is ANY doubt about it being perfect, replace it. Amal parts are cheap ebough. Just be sure the "cutaway" number on the new part matches what the parts book calls for. Worn slides, and eventually carb bodies are the cause of 95% of all running problems with these bikes. I love the BSA singles, and have put a fair number of miles on them. I am looking for another, as I sold mine after a fairly good car accident. Wish I hadn't done that. The way to tell the displacement is B25 ( or a bunch of letters then 25) = 250. B44 = 441. The frame number should match the engine number.