G'day everyone,
You have probably checked these but you never know. Is your decompressor and the rubber line all sealed and working properly? I don't know if it will make much of a difference to the fast running and idle, but this does have a vacuum line that connects to the neck of the carby. If you did have an air leak here somewhere it may make it run a bit faster? Also the wires and the rubber peices that go in to the carby for the kill switch, maybe they can also leak air into the engine if they are not inserted and sealing properly?
I am just thinking about what other items may cause this over revving problem on your mower. Apart from the last resort and stripping the engine down to change the crankcase seals.
On mine I did put a new decompressor on it years ago and I also got new rubbers for the kill switch wiring. I figured that they don't cost all that much and there not hard to change, considering I had my engine rebuilt by a mower shop I just replaced alot of things that might have worn out with age, and I also was trying to get my idle speed down so I wanted to make sure I didn't have an air leak from anywhere.
Cheers!
Last edited by Converse; 16/02/19 02:15 PM.
