Kuler64

[Kuler64]

exmark 27hp kohler pings under load and starts missing after a time then picks back up 20 minutes or so later

 

[ILENGINE]

Get us the model and spec number off of the engine tag so we can see what configuration of engine you have.

 

[RDA.Lawns]

exmark 27hp kohler pings under load and starts missing after a time then picks back up 20 minutes or so later

First thought is bad gas. Sounds like what is referred to as labor knock . could be a few different causes . First replace the gas with good fresh gas. Check for results .No improvement your carb could be to lean .