Poulan Pro Trimmer Carb Settings

[dennis]

I have a Poulan Pro model PP136 string trimmer. I would like to know the intial settings for the high and low mixture screws, and the idle and maximum allowable WOT rpms. Thank you

[KE4AVB]

Initial setting is usually 1-1/2 turns from lightly seated for both L and H. This should get you to a will start condition. Tune for max rpms minus -100 rpms CCW (richer). This ensures that you are not on the lean side. Idle speed is just below clutch engage speed which is around 3500 rpms. I usually set it around 2800-3000 rpms. Otherwords you don't want the trimmer head turning while idling. Since mixtures interact with each other tune L first and then H. You may need fine tune for best acceleration.

[dennis]

Thanks, KE4AVB. Do you know what the maximum rpms are for this unit?

[KE4AVB]

Honestly no it has been quite a while since the last one I work on here. I just know it is not a problem to run well over 7000. Just don't like that carburetor setup with it comes to starting them; I prefer an old fashion choke.

[Skywatcher]

Hi Dennis

When tuning a string trimmer, make sure you have the working lengths (double line head) of correct diameter trimmer line. The resistance of the line passing through the air at working RPM gives just enough load to work like a governor for the engine. All the best,

Sky

[dennis]

Thanks Skywatcher and KE4AVB. It sounds about right when it is running at 9500-10,000 rpms.