20 HP Onan issues
I have a 420 Steiner with a 20 HP Onan. It runs fine until you load the engine, like when you engage the PTO on the snow blower and try to blow snow. The engine starts missing and backfires thru the intake. I try and choke it but only gets worse. Have had a good mechanic look at it twice, he tinkers with the carb and it runs OK for 30 min or so then back to no power and backfiring. The engine does have 1900 hours on it? maybe its wore out? Any ideas?