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I have a 1988 318 John Deere garden tractor and it revs really high when i turn the throttle up and revs comes back down after a few seconds. But overall,, full throttle engine is over-revving, can only run have throttle. Sometimes surges up and down when cutting grass also. Was surging up and down before the over-revving of the engine started. Tried removing carb and blew out with air, didn't help, any ideas?

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If your rpm's are high/sluggish and slow reacting its do to your govenor inside your engine needing to be fixed.There is a plastic housing with fingers on it that will break and allowing metal balls to free float.Another problem with them is that the washer under the retaining ring will fail or loose tolerance,also located inside engine.

Posted on Nov 16, 2009

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For some reason the throttle linkage is binding or is gummed up preventing it's free movement which also prevents it from responding to the governor properly resulting in your overspeed incidents.

You could try spraying the outside of the carburator with carburetor cleaner from a parts store like NAPA or checker auto but I like using Brake cleaner for the same purpose as it's a tad more powerful in disolving the nasty stuff away and it does absolutely dry up totally. Both of these products come in a pressureized spray paint type of can and with nozzles so you can get right onto the gummy parts and clean them out. Move the throttle open and closed with your finger as you clean the carburetor to ensure that the throttle no longer sticks open or shut.

Posted on Jun 28, 2009

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