139QMB carburetor throttle spring

[kamil7543]

I am from Poland and I do not write well in English, I apologize for any slip of the tongue.

Last time i bought carburetor repair kit beacause i had broken float.But in repair kit spring was thougher than the standard spring.I apologize for such a short description but I don't have much time.My question is whether a harder throttle spring can have a big impact on carburetor adjustment?

Greetings from Poland

[GrumpyUnk]

If the spring is the one on top of the slide diaphragm, installing a stronger spring will make the slide stay lower in its bore than a weaker spring. I think it would restrict airflow through the carburetor.
I have a diaphragm that does not reach around the groove which I stretched to make fit. It was so tight that it did not want to allow the slide to move upward when the throttle was opened. It ran poorly.
I would suggest using the original spring. If it worked well before, use it again. They do not wear out mostly, but will last the life of the carburetor.
Do make sure the float is about parallel to the venturi when installed, and the carburetor upside down. Float design normally is parallel to the float bowl gasket surface, but these carbs have a slanted gasket, so you cannot align with that surface, and must generally choose the 'line' of the carb flow.
tom

[Mech Warrior]

Well if the spring is for the float if it is too stiff you find out quickly because the scoot will be flooding because the spring will be so stiff it will not allow the float needle to properly seat causing free flowing fuel into engine at all times you will find out relatively fast.