Does yours turn off like a switch or does it blubber on a bit?
 

OK, I fixed my Irvine .39 not shutting down problem by making sure that the carb is pushed down firmly before tightening the bolt; But:

When you shut the throttle down, it still wants to blubber on for a couple of seconds before actually quitting.

I'm almost sure that on my air bleed carbs (OS LA) they shut down immediately, so -

Do yours shut down immediately (almost like a switch), or
do they blubber on a bit?

Does yours turn off like a switch or does it blubber on a bit?
 

Hi,
I have a .40FX and it shuts down immediatly. No blubbering

Does yours turn off like a switch or does it blubber on a bit?
 

Same on .61 SF-P --> instant stop.

blubbering on
 

HI it sounds like there is a small air leak around the carb. You need to find some o-ring lube...I think it is a silicone based lubricant....and reinstall the carb. This extra grease might seal the leak. Do not use petroleum based grease on o-rings! It will deteriorate them in short order!

Hope this helps!
Regards
Mark

Does yours turn off like a switch or does it blubber on a bit?
 

.25FP , 2 46FX'es , 40LA , 2 46LA's all shut down like a switch ... check that o ring man.

Does yours turn off like a switch or does it blubber on a bit?
 

I have heard of those problems on the Irvine, GMS, and Tower (GMS) engines...Seems common with all of them. All the engines I have ever had shut down real quick with the throttle closed. No problems...

Does yours turn off like a switch or does it blubber on a bit?
 

Thanks,guys... I'll look into the O ring lube..

Lube?
 

Found some stuff in the auto store the other day, I think it was caleed di-electric grease - used for spark plug caps etc.
Anyway it said 100% silicone.
The engine still runs on a bit, but at least it does shut down.... :)

Re: Lube?
 

glad to here it