Hi Don,
If you have the Amal carb, the correct main jet is a 45 availlable from Surrey Cycles 01483 272328. I run several Power Paks, and they all run a little rich flat out downhill. I guess it's no bad thing.
Alan
----- Original Message -----From: Don WilcoxSent: Wednesday, September 24, 2008 9:55 AMSubject: [pip_squeak_and_wilfred] Power PacHas anyone got a spare main jet for my power pac or can give me details
of its bore size..Mine is not the correct one and is running lean. I
have filled it with solder and gradually opening it out but the exact
size or a correct one would be a great help....Thanks folks