ampsucker
Platinum Member
howdy!
i have a 17.5 kohler single cylinder 4-stroke on one of the Scott's/Deere lawn mowers with about 650 hours on it. it runs great most of the time but under a heavy load acts like it's starving for gas every 5-10 minutes of mowing. i'll hit a heavy spot of grass and when the governor requests more fuel from the carb, it stumbles and almost dies. if i stop forward motion and drop the throttle down about half, the engine will catch up and then run fine again up at full throttle for 5-10 minutes.
i have replaced the fuel filter and fuel pump and cleaned the carb. i also put on a new governor rod retention clip ordered new from deere. the fuel tank seems clean and doesn't act like there is a vacuum or pressure build up when i take off the fill lid.
a new carb is about 150 bucks. i may do this next as i feel i'm running out of options and need the mower to work this season. i don't know much about these modern carbs. this particular one has a wire with a plunger device mounted in the bowl of the carb which takes the place of the older style needle and seat. there is one adjustment needle on the front of the carb body which i believe is low speed or idle adjustment.
anybody have any ideas or common failure modes on this engine? i'll have to order a new carb soon, if i can't fix this one.
any thoughts much appreciated.
amp
i have a 17.5 kohler single cylinder 4-stroke on one of the Scott's/Deere lawn mowers with about 650 hours on it. it runs great most of the time but under a heavy load acts like it's starving for gas every 5-10 minutes of mowing. i'll hit a heavy spot of grass and when the governor requests more fuel from the carb, it stumbles and almost dies. if i stop forward motion and drop the throttle down about half, the engine will catch up and then run fine again up at full throttle for 5-10 minutes.
i have replaced the fuel filter and fuel pump and cleaned the carb. i also put on a new governor rod retention clip ordered new from deere. the fuel tank seems clean and doesn't act like there is a vacuum or pressure build up when i take off the fill lid.
a new carb is about 150 bucks. i may do this next as i feel i'm running out of options and need the mower to work this season. i don't know much about these modern carbs. this particular one has a wire with a plunger device mounted in the bowl of the carb which takes the place of the older style needle and seat. there is one adjustment needle on the front of the carb body which i believe is low speed or idle adjustment.
anybody have any ideas or common failure modes on this engine? i'll have to order a new carb soon, if i can't fix this one.
any thoughts much appreciated.
amp