It still sounds like a carburation issue. Are you sure all jets, vents and ports in carb are open? Another possibility is that the governor setting is off. The governor is the rod that comes out of side of engine and connects to throttle linkage on carb. To set governor to factory setting, push governor linkage in direction that opens throttle valve, loosen screw on governor arm and turn rod in same direction until it stops, while holding in this position tighten screw on governor arm. This is called a static setting. If this doesn't work I would disassemble carb, remove all plastic and rubber parts and soak in carb dip overnight. Picture may be different from your unit but it shows governor linkage to carb. Good luck and happy wrenching!
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SOURCE: lawn mower running problem
There are no adjustments for the carb., however, in the bolt that holds the bowl on, there is a small hole in the threads that must be clean in order for it to run right. It is a real small hole on either the 3rd or 4th thread from the top.
Hope this helps
SOURCE: mower surging
let it surge, it will usually get better as it warms up. These 6.5 Hp engines are fine except they have an cheap badly designed carburator. Nothing can be done about this problem. They all surge eventually.
hi
remove the bowl again and get the centre jet out and lok very closely use a jewlers eye piece you wll find a passage that is plugged on the side of the jet look around it you ll see some sign of a hole that is not clear through its pretty small use a welders torch cleanng tool with various size rods use very thin one dont make the hole bigger
Joe
Testimonial: "thanks for the ideas on fixing my problem I'm going over to my neighbors on Sunday and I'll try out your suggestions thanks again Al"
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