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folke2000

Jiffy carburator settings

6 posts in this topic

Which screw is the high sped idle jet screw on a 2 hp tecumsah (sp?) motor. My auger quits under a load, and after warm up will only drill at full choke. It has fresh gas, with seafoam. Any help is greatly appreciated.

Thanks for a great forum.

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There will be a L and H on the carb body to identify the high and low adjustment screw.
In your case turn the High speed out 1/4 turns till it run right.

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I have a similar problem, mine won't stay going unless I keep giving it gas in between drilling holes. Should I be turning the L screw 1/4 turns clockwise until it runs better at low speeds? Will this effect how it runs at higher speeds? I don't want to mess the top end up, because it runs great right now when I'm drilling.

I wish I knew more about small engines.

Evenflow

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Threes 3 adjustments. Idle Speed: which is a set screw on the linkage. This adustment simply sets the RPM's at idle.
Low Speed fuel mixture: Its possible to lean this out TO MUCH and then compinsate with the Idle Speed.
High Speed fuel mixture: Set this till you get high RPM's at full throttle under a load. Then turn out 1/4 turn, Why? so you arent running to lean.


Evenflow, We dont know if your getting to much or not enough gas. Turn your low speed in {clockwise) while counting turns till it just stops, dont over tighten the adjustment needle.
Now back it out to where it was. Start the auger and turn out (counterclockwise)
1/4 turns. If you improvement then go back to your starting point and turn in 1/4 turns.

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Hey ST,

I finally got around to adjusting my my auger and there are only TWO screws, now I'm really confused... There is one for the idle speed, and one that has L and H on opposite sides. Should there be another screw somewhere? Do I have to open the carb body? Or look somewhere else?

Evenflow

------------------
It's all just theory till you hit the water.

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The only adjustment inside is fuel level.
What's the carb name and number.
Is your Jiffy a 3 hr.?

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