Thanks for that info.
I had noticed if I lift the top plastic ring and rotate it clockwise relative to the lower ring the engine revs higher on full throttle.
Are the vertical lies scribed on the plastic collars some sort of limits? At the moment the single line on the upper collar is lined up with one of the lines on the lower collar.
A silly question now. How fast should it go and how would you measure the engne speed?
Dave
