John Deere L120 won't rev up

[jlg1234]

Hey, need advice on this....about ready to throw in towel.

Have a John Deere l120 thats about 7 years old. Has a CV23 Kohler engine 23 HP. Couple of weeks back, it started running very rich and has gotten to where it will crank but will only run at idle and when u rev engine up it will choke out....u can tell it is running extremely rich even with choke off. Below are the things I have done to try to fix but with no luck.

Cleaned carb three times(including the solenoid valve....not a speck of dirt/varnish in it....no effect
tried adjusting carb....turning the mix screw has no effect at all on the engine
removed air filter and tested running with no air filter...no effect
replaced fuel filter, also bypassed filter with no effect
cleaned spark plugs
checked gap on valves
checked to make sure it was getting gas from fuel pump....no issue there
as a last ditch effort, i took a cab from a 78 model john deere 110 and retrofitted it to my l120. mower cranked right up but with same issue, will not rev up.

Any new direction will be much appreciated. out of things to check.

 

[ILENGINE]

I would start looking at the the flywheel key to see if it is sheared. or maybe something goofy with the the spark advance system throwing the timing off.

 

[jlg1234]

Hey, need advice on this....about ready to throw in towel.

Have a John Deere l120 thats about 7 years old. Has a CV23 Kohler engine 23 HP. Couple of weeks back, it started running very rich and has gotten to where it will crank but will only run at idle and when u rev engine up it will choke out....u can tell it is running extremely rich even with choke off. Below are the things I have done to try to fix but with no luck.

Cleaned carb three times(including the solenoid valve....not a speck of dirt/varnish in it....no effect
tried adjusting carb....turning the mix screw has no effect at all on the engine
removed air filter and tested running with no air filter...no effect
replaced fuel filter, also bypassed filter with no effect
cleaned spark plugs
checked gap on valves
checked to make sure it was getting gas from fuel pump....no issue there
as a last ditch effort, i took a cab from a 78 model john deere 110 and retrofitted it to my l120. mower cranked right up but with same issue, will not rev up.

Any new direction will be much appreciated. out of things to check.

update, tried fresh gas with the carb from another mower ...placed hose directly in can...and motor ran great. figured at that point bad gas was the issue....put my original carb back on mower, running it with fresh gas directly from the can, and back to not reving up again.....thouroughly confused here....so bad gas and a bad carb mayb???

 

[logan01]

update, tried fresh gas with the carb from another mower ...placed hose directly in can...and motor ran great. figured at that point bad gas was the issue....put my original carb back on mower, running it with fresh gas directly from the can, and back to not reving up again.....thouroughly confused here....so bad gas and a bad carb mayb???

Sounds like the gas is fine if the same gas worked with the other carb. Some carbs are costly and some not. Your call on a thorough cleaning and kit or new carb.

 

[SeniorCitizen]

Bad gas tank tube pickup.