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Anonymous Posted on Jun 30, 2012

McCulloch MT780 gas trimmer carburetor adjustment

5 Related Answers

Anonymous

  • 279 Answers
  • Posted on Sep 09, 2009

SOURCE: trimmer does not come up to speed. Changed the gas

If you look on the carb you will find two screws next to each other. Find the one for "hi" and that is the one you need. Start the engine and warm it up. When you are ready, take a screwdriver of the proper size , press the lever to go to high rpm's hold the throttle down. Turn the screw for "hi" in slowly until the engine starts to lose even more rpm's. Open the screw slowly until you get max rpm's and keep going until it starts to lose again. Turn the other way about half way between. If that was the problem, you should be done. Good luck...Lee

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Anonymous

  • 155 Answers
  • Posted on Sep 10, 2009

SOURCE: Need Gas Line installation instructions for a

Hi Start from the filter in the tank to the bottom of the carby then from the top of the carby to the short primer pipe then from the long pipe on the primer back to the tank. Hope this helps.

budgie140

Ian Summerfield

  • 502 Answers
  • Posted on Jun 29, 2010

SOURCE: unable to adjust carburetor after overhauling, engine idle

most modern carbies have fixed jets.some you can pry off the caps and adjust,but usually if you need to adjust carbie,youve got other problems.stale fuel,not enough compression,vaccuum leak,spark plug faulty[oiled up]carb gaskets letting in air,needle valve adjustment causing diapragm to not open it enough.used the wrong gaskets in the kit[sometimes they have different model gaskets in one kit

rycgl

Roy Cagle

  • 1545 Answers
  • Posted on Jul 12, 2010

SOURCE: can not adjust carburetor

Yes...they have them on Ebay. Normally you won't be able to get one from a small engine repair place or dealer unless you're "in" with them. You can make using a 22 gauge-18 calibre electrical connector. (Quick disconnects-female) They need to be female spade terminals and you can stick um on the end of a screw driver and then push them down over the round-splined heads of the L and H adjusting needles on the carb. Probably have them at auto parts store....if not Radio Shack.

hunter19_46m

Curtis Sewell

  • 7482 Answers
  • Posted on Jul 09, 2011

SOURCE: What is the high /

Hi dcheddy...

Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have tried to adjust them already then this should get it running...then do your final adjustment when the engine is warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
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