When I go to full throttle it seems to be not as high as it has been in the past. - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 2 (permalink) Old 03-21-2020, 06:07 PM Thread Starter
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When I go to full throttle it seems to be not as high as it has been in the past.

I have a Toro Groundmaster 120 with Koler twin V the engine doesn't seem to revup as high

When I go to full throttle it seems to be not as high as it has been in the past. When I turn on the blades it doesn't come up to speed full speed and boggs down. I have changed the fuel and plugs and oil filter and oil and also the fuel.
When i push on the lever where that spring connects to in the one picture the engine revs up. Something maybe governor .
Anyone have any ideas what is wrong.?????????????????

Hope some one can help me.
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post #2 of 2 (permalink) Old 03-25-2020, 07:47 AM
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Yes sir, I believe you may be running on just one cylinder. Exact same symptoms I experienced a year ago.

To test this theory: Take a pair of pliers with rubber grips. With engine running pull a spark plug wire off. If the engine keeps running you know the opposite cylinder is still working. If engine dies you know the opposite cylinder is not working. If it continued to run. Kill engine. Hook up spark plug wire again. Start engine. Then disconnect the opposite side spark plug wire.

I had same problem on a commercial zero turn a while back. It ended up being a bent push rod that wasn't allowing a valve to open/close.

Hope this helps.

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Tango (Tom)
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