I have a 5 year old mower, with a Briggs and Stratton 6hp engine, that is
losing power. I've changed the air filter, the spark plug, the gas, cleaned
it up, and the engine is still running slow. And yes, I checked the lever
that adjusts the engine to fast or slow. What else could it be?
Most likely the cable from that lever slipped in the holding clamp (by
carburetor). Loosen that clamp and see if it speeds up when you push
the throttle with your finger or a tool.
If that dont do it, the power needle on carb needs adjustment, or the
governor is out of adjustment. If you adjust these things, be sure to
mark where they were (how many turns you made). so you can set it back
if thats not the problem.
One other thing, could you have some bad or old gas?
A little carb cleaner in the gas tank never hurts either.
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