Re: OT Kohler 18HP Command Engine Question

Posted by George Marsh on September 29, 2014 at 15:16:33 from (50.104.98.200):

In Reply to: OT Kohler 18HP Command Engine Question posted by John B. on September 29, 2014 at 09:55:24:

I recently purchased a used 18 hp kohler command horizontal shaft off a Cub Cadet. Only paid $35 for it. I purchased it because it has an old style carb with adjustments. My 20 hp command has fixed jets. A kohler coil costs $50, so I feel like I got a bargain, 2 coils, carb and starter.

That said, my 20 hp command has no timing. The magnets on flywheel are in a fixed position and the coils go in a fixed place. No timing. I use 3 one dollar bills to space coil above magnets before I tighten the coil in place.

One thing I've learned about the kohler carb is there are 3 tiny vent holes on the top part of carb. They must be kept clean or the engine will run rich. I use 30 psi of air and blow each vent hole out and you will see a stream of gas come out holes above throttle plate.

The used engine I purchased didn't had 300 hours on it. The engine was used is a dirty environment on the Cub cadet. The owner said the engine overheated and he junked it out. WOW, over heated and 100% blockage in head cooling fines. Go figure a Kohler earns a bad reputation for not lasting 300 hours when the IDIOT didn't take care of it. I have 1500+ hours on my Kohler, use no oil, never had heads taken off, done anything except preventive maintance.

If any engine doesn't get enough gas, it won't make power, just that simple. However if it gets too much gas it won't work right either. Look at spark plugs, if black with carbon, too much gas. My experience is that a lean engine will run just fine until it's put under load. It takes gas to feed the all horses. Check air filter, gas filter and you may have to take carb apart to check for any blockages. You may have too low of float level or the governor is set to respond too fast, carb can't keep up. Good luck.
George

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