1974 140 will not run at high idle
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It sounds like your carb is not set correctly. Go to this link, get your K series engine manual and go to the setting instructions. I'm betting your high idle/main jet isn't adjusted correctly.
http://www.kohlerengines.com/onlinecatalog/pdf/tp_2379.pdf
Page 40, Figure 6-20
Good luck.
http://www.kohlerengines.com/onlinecatalog/pdf/tp_2379.pdf
Page 40, Figure 6-20
Good luck.
If the carb is not the answer, recheck your timing (point gap). I had the same issues with mine. I also run premium gas now with a small amount of octane booster. I get a pop now and then on a quick throttle deceleration , but overall greatly improved.
Two other quick & easy things to check:
I had installed a new set of points the previous owner had when I bought a tractor. They were Kohler exact points still in the bag. Made sure I cleaned the "oily" film off them. Gap set correctly but got the pops & odd firing at higher RPM. Had to clean them a second time to remove the oxidation that must have developed over however long they'd been on dealer shelf.
On another tractor I had similar issue. Cleaning ground wire bolts, wire connectors, & engine & frame contact points fixed that.
Jay
I had installed a new set of points the previous owner had when I bought a tractor. They were Kohler exact points still in the bag. Made sure I cleaned the "oily" film off them. Gap set correctly but got the pops & odd firing at higher RPM. Had to clean them a second time to remove the oxidation that must have developed over however long they'd been on dealer shelf.
On another tractor I had similar issue. Cleaning ground wire bolts, wire connectors, & engine & frame contact points fixed that.
Jay
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