Marvel Mystery fixed MMy MMOwer

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So I was visiting folks on this resort island. Their landlady didn't mow before she left and the tiny yard was something of a hayfield. Undaunted, bored, and full of hops and barley, I wandered over to the town dump and picked up your archetypal 20" 3 hp B&S junky mower.

Brought it back, found the 1/2" bolt by the gas tank/primer bulb was loose, hand tightened it. Would run on the primer but then die.

Armed with a cheezy 4-in-1 screwdriver, a crescent wrench, and a bread tie stripped of its paper, I dove into the carb. Found a "small pool of gas" on top of the tank that was full of yellow fuel and clear water bubbles. A slit let me dunk this back into the tank. Wiped it with a paper towel. Stuck the bread tie through any jets and holes I could find. Put it back together sans air cleaner and held the throttle wide open against the governor's wishes. Did I mention the crank case breather thing into the carb was missing the rubber boot? Big dusty skid mark inside the carb from that unfiltered leak. (I plugged this leak with an old bolt.)

Eventually, the high vacuum from the valve floating RPM fracas slurped something through the carb and I was able to mow the grass. The blade was so dull it had all the effectiveness of beating the grass with a broom handle, but the place eventually looked nice.

Brought this one home, as it has adjustable wheels. Unfortunately, next mow event it pulled the same stunt. I drained the possibly funky gas, got it running again (the same overrevving way) then put about a 1:30 mix of MMO in the gas. Mowed the lawn. OMG the deadman control still works on this thing! And the engine is rated in torque and cc's not HP. The future is here! Anyway I was stopping and restarting semi-cold... son of a gun, the shock treatment worked.
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Only thing about the wheels, are the two modes one click apart: Golf course and normal. About 3/4" difference.
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Golf course is too short for my slightly bumpy lawn.
 
Originally Posted By: eljefino
OMG the deadman control still works on this thing! And the engine is rated in torque and cc's not HP. The future is here!


That mower must be what??? All of four years old??? People really throw stuff that new away???(yeah I know we live in a throw away society these days) It's just a baby compared to the mostly 30 year old mowers I'm using(that are hand-me-downs or curb finds)...

BTW good job, most times this stuff can be fixed my someone with a little mechanical aptitude... Former owner probably never did anything but gas and go...
 
Good dosing of MMO in the Honda 390GX Power washer once a month keeps things from gumming up in the carbs. MMO is my first go-to when working on any motor thats been sitting. Good story!
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For 20+ years, I have always used MMO mixed with my small engine gasoline supply can. Never have had a fuel related issue nor have had to use any "fuel stabilizer" dedicated product for long term storage of my OPE.
 
Originally Posted By: SuperDave456
Kreen would of done it faster!
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Yeah, if you used kreen, the rubber boot would have reappeared and the blade would have been sharp. Still, not bad!
 
Good work, my buddy has(maybe had now) a similar mower with a govenor problem. He's not to mechanically inclined but he did figure out how put an elastic on the carb to hold the throttle WO... He ran it for a quite a while that way and it seemed to be ok with it. I was kind of worried about the crankshaft breaking and having the blade set free at maximum rpms so I suggested he get it fixed.
 
Mowed again with it after sitting all week, ran out the MMO gas, refilled with regular. Started on first pull and stayed running.
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These MMOwers sound great at ungovered max output, kind of like a seaplane. I wouldn't want to work with them in this state though; the vibrations through the handles would kill my nerves.
 
Originally Posted By: eljefino
Mowed again with it after sitting all week, ran out the MMO gas, refilled with regular. Started on first pull and stayed running.
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These MMOwers sound great at ungovered max output, kind of like a seaplane. I wouldn't want to work with them in this state though; the vibrations through the handles would kill my nerves.



It`s amazing how much abuse those little motors can take. Kind of like an old Chevy straight six.
 
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