Hi all,

Originally Posted by Gadge
That is, the familiar combustion chamber compression, which is easy to measure with a gauge; and crankcase compression.

Gadge, I completely agree, however never thought of testing it. FYI, after a little searching I found this:

http://www.dansmc.com/vacuum_testing.htm

In short, it says to block the exhaust and inlet ports, then perform a pressure and vacuum test via the spark plug port.

I think I have the tools to do that but without the time to do that now, I did run down and spin the blades (Spark plug out of course), and in what felt like one rotation or just under, felt resistance twice, with a small break in between.

Still to try putting the muffler back on and giving it a whirl, and still waiting on the new needle and take-down of the carby to test, but I'll let you all know how I go!