Britbike forum Forums Thread Like Summary - B44 Amal Set Up Help

My 68 B44 has an Amal 930-21. Manual calls for a 930-11. Is there any difference? It has a 230 main, 107 needle jet, and I believe a 25 pilot jet. I ran a .023 guutar string all the way through the pilot jet. Ok. Here’s my problem. Runs lean. Have to keep the choke 3/4 closed to make it run ok. Needle is in lowest notch (richest setting), and pilot air screw only 3/4 turn out. Any ideas? Carb is not worn out. Boyer installed and strobed to proper timing.

Allan,
I actually admire the AMAL. It was made to fit a very wide variety of bikes and with a wide range of adjustments to get the mixture right. My brother put a pair on his aircooled VW bug. I am a fan of the carbs because they work very well when you get it right. I think the bikes were probably factory jetted a bit rich to protect the engine from overheating. From a manufacturing viewpoint they are an engineers dream because of simplicity and one basic carb has many applications and interchangeable parts..

Mr Mike