Dear Stork,
Great Diagram.
What is the I.M.S just below the Throttle Valve Cut Away envelop.
Regards,
Brinky.

Removed the carby today and used an Oxy tip cleaning tool which measured 1.25mm in diameter to increase the size of the 1.20mm diameter main jet. This I felt was a reasonable jet size as I am 1000ft above mean sea level and the manufacturer recommends a 1.26 jet at sea level. I adjusted the idle ...

Thanks Frank. Good info.

Dear Neo,
I agree, float level correct, vents/passages all clear. I shall return the jetting to OEM. Nothing worse than a 2T running lean at high power setting.
Regards,
Brinky.

My 290 is running lean at high power settings. After an audit of the jets I note that the Main Jet is a 120. The manual calls fot a 126 Main Jet. I am new to trials and wonder if this is a trials thing to stop loading up or to help with unusual attitude issues. I am inclined to return to the ...