Hi Max, quick update. I adjusted the governor, started the engine with the same high rev. I then did a manual check on the arm, linkage and throttle and found somehow the governor arm movement was restricted prohibiting closure of throttle. This was rectified and now the engine is running at good rev, ramping up and down smoothly.

Still stalling on idle so will clean the intermediate fuel path when I get a chance in the next few days.

Glad it’s one positive step ahead with the governor adjustment. I’ll report back on idling later - hopefully another +ve step froward to report. Thank you again.