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blackfarms1

9020 Engine rpm help

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blackfarms1
Don't know if this is true but I was told a few days ago that the cckb onan's were sent from the factory with under 20 hp so that they did not have to go through the Nebraska power test. The gentleman said they were only turning around 3200 rpm but can be safely turned up to around 3900 rpm. He was a simplicity dealer for many years. So what do you think guys, safe to turn her up. He says it makes a new mower out of them. Thanks in advance, Sean

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BLT
All mechanical variable speed engine governors have what is called droop. That is the differnece between the engine running at no load and full load. Most air cooled engines have a target speed of 3600RPM and a 7-10% droop range. So if you have a 10% governor 3900 RPM is doable, not as a working speed, but a no load speed. They only way to get a zero droop or close to the trarget speed would be to have an electronic governor that reads flywheel tooth count for a more precise RPM control.

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BLT
The closest you can get for now is by engaging the mower, then ruu unit at wide open throttle and see how close to 3600 RPM you are at. I downloaded a 1690230 operators manual and that indicates the target 3600 full load RPM. The mower should be enough to give you a reasonable load.

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