Recent content by JBtoro

Haven't sprayed yet but I did take off the air box cover so I could temporarily block off the intake of air through the carb. Saw a video where a mower continued to run after so doing (meaning that enough air was getting in elsewhere) thus indicating and later revealing a cracked intake tube...

Thanks. Maybe you missed it in my original post, "I even opened the bowl nut jet on one of the carbs with micro drill bits increasing the opening incrementally 3 sizes up from OEM." That is, I inserted bits until I found the 1st one that would not go vertically through the OEM bowl nut jet hole...

Thanks, will try that in the am. But again, I must ask, if in fact there is too much air getting in from the tube or elsewhere, why would the engine run great under load (blade engaged) but only surge under no load?

Your advice is most welcome. I think you must mean passages clogged to some extent. Perhaps, but I tried 2 other used carbs pulled from working, non-surging engines plus a new carb and the problem persists. The only passages I know of are the two pictured below plus the bowl nut passages which...

Quantum Model 120000 675 Series. Just one gov spring. Will check the intake tube. But if in fact there is too much air getting in from the tube or elsewhere, why would the engine run great under load (blade engaged) but only surge under no load?

Neighbor brought a Toro Personal Pace (Briggs 7.0 Quantum) with the blade clutch feature. When it starts with the blade not yet engaged, it surges wildly. But when the bail is pulled thus engaging the blade, it runs great (3200 RPM). Tried several known good & clean (one brand new) carbs & still...