Kohler 25hp stalling under load?

[chip6990]

i got a '03 GT3235 w/a 25HP Kohler Com. It started losing rpm when i was mowing thick high grass, i noticed i was smoking the PTO drive belt. so i replaced the drive belts and blades. today when i mowed, at first when i engaged the blades, it souned like it was gonna take off like a helicopter, after about 3 swipes, it started losing rpm. the grass was not thick and maybe cutting 1/2" off at most. i gotta stop and let the rpm's come back up before i can continue. if i move at a snails pace, it seems ok, but if i try to get after it at all, it seems it cant keep up. i have the vacuum actuater adjustable rod, adjusted as far as it can go to put the most pressure on the belt. my guess is that its losing vacuum somewhere. this a common problem? any idea are greatly appreciated. cant make any $$$ just crawling.

i thought i fixed my problem, i changed my spark plugs. 1 was real black and sooty and the other was ghost white. how can one cylinder be running rich and the other lean? so i changed the plugs, the new plugs def. helped with idling, but didnt solve the motor bogging problem. if i am mowing down hill, it dont bog, but if i am level or going up hill, once i apply the gas pedal, it starts dieing down till i have to stop and wait for it to catch up. i thought the vacuum actuator was bad slowing the blades down, but its def the motor. to test this theory, i turned the blades off and went full throttle across the yard. halfway across, the motor nearly stalled and died. any fixes to this problem without going to a cub service dealer or small engine repair shop?


i had some issues with it running last summer, had some some so called "small engine experts" tell me it was just the carb needing to be cleaned. well they cleaned it alright. it wouldnt even start. i figured out they put the needle jet in upside down and put an o-ring over 1 orafice. i fixed that and figured out that it was the solenoid on the back of the carb that was my problem. so im thinking it has to be carb related.

any detailed links or pictures on how to clean and adjust the carb or gov. on it?

[Vince_o]

Sounds like the gov isnt working corectly.

[dsmithjr]

Just a thought but I had a similar issue when my gas cap stopped up. You might check to see that the vent hole is clean and the tank can draw air. I took the cap off used some carb cleaner to clean the vent hole in the cap.

[chip6990]

Its NOT a bad coil! It lit me up.then I was dumb enough to do our to the other side, yep, lit up again. Its getting spark and coil is definitely good. I pulled the plugs, both are a little black and sooty. I believe its a carb/gov issue. I ran it for bout 10 min mowing today, it never skipped a beat. Only doing it once its really hot I guess.

[Vince_o]

Chip

The control plate on them can be a bit confusing. I just follow the manual at work on my comp to do them. It should idle around 1200 +/- 200 and top Im guessing should be around 3750 +/- 50 thats where most commands run.

I did a toro 72 a few weeks back that was kinda acting like yours and top no load was around 2400 and the thing wouldnt cut anything. I adjusted the throtal and what a world of differance! Maybe get you a tinny tack and see where your eng rpms are first both top no load and idle and go from there.

I would never have guessed a coil, but hows you heart beating now

[chip6990]

It only skipped for a few hours.