Carb adjustments

[bsimmons]

I adjusted the carbs on both my 102 and 125 they are running better but both pop after shut off, sounds like a 12 gauge shotgun going off. I have used the manuals to adjust but I can't get rid of the popping at shut off. Any help out there.

[Amigatec]

My 129 does the same thing, it always has.

[dale campbell]

have you checked the timing,also let them idle about 15 seconds or so them shut them off

[Amigatec]

I rebuilt the motor, bought a brand new carb, bought a new muffler, I idle it down to about 1200, let it run for several minutes, and mine still does it.

[J Hayes]

do you shut it off too early after running it hard? could be the common problem of carbon detonation. try letting it idle for a bit at idle so fuel don't load up .

[bsimmons]

My 123 doesn't do it, so it has to be an adjustment issue. I may have to check the timing.

[Farmallgray]

It may be idling too fast or too rich.

[ksanders]

I'd second double-checking the timing. Also turn the main jet in an 1/8 of a turn or so and see if it still does it (provided it still runs good turned in a little).

[wdeturck]

This has been talked about a lot over the years and seems very common for some Kohler engines and I have never heard of a solution to the problem and I don't think it's timing. There was a name for it but can't remember it(Kohler Kough or something like that)

[bsimmons]

Thanks for the insight guys, much appreciated.

[J Hayes]

"Kohler Kough"
Isn't that caused by carbon build up the exhaust valve as it is close to the exhaust port, and being cherry red from running it will detonate gas that is drawn into cylinder because it was idling too fast when shut down ?

[bsimmons]

I took some time with both of them today got the 125 perfect, the 102 doesn't pop now but has no power under load.

[aar]

Main fuel jet leaned down to much?