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Chainsaw carb adjustment on a TB4218cc it will not idle and will not rev up a friend of mine turned the high and low screws...can you please help me...what are the adjustments to get it to idle and rev up

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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dennisgladx
  • 52 Answers

SOURCE: high geared chainsaw

Hi 1tgriffin,
My name is Dennis and I hope that will serve your needs.
IDLE ADJUSTMENTS:
There are three adjustment screws on the carburetor labeled
H (for High speed MIXTURE)
L (for low speed MIXTURE)
T (for idle SPEED SETTING)
They are located just above the primer bulb. If your saw floods so soon in the starting process the idle mixture setting can be set too rich and the speed may be set too slow. Remember the chain will not move when the idle speed is set correctly with a WARM ENGINE!
Adjust the idle speed to just below chain movement WITH A WARM ENGINE this is just below the activation RPM of the centrifugal clutch. Let the engine run at a higher speed than idle until it is warm -- 3 min -- you may have to keep goosing it until then.
Please don't exceed the limits of the plastic limiters when making adjustments.
If you haven't adjusted the mixture screws you may just have to adjust the idle speed and that can start my turning that screw all the way in to the stop and then back out 4-1/2 turns for a good place to start. FAST IDLE -- Adjust the speed until the engine runs with out the chain moving. Adjust clockwise to increase speed. C clockwise to decrease engine speed.
Accelerate the engine and if it stumbles and makes too much smoke it's too rich turn the
LOW SPEED MIXTURE (in) clockwise in 1/16 a turn increments NO MORE at a time because a two cycle needs to run at a setting for a short time to really prove the setting. don’t run it wide open to warm it up but it should be at a fast idle. Nothing you do will be proven correct until the engine is warm.
Good Luck
Glad to be of assistance - please rate the solution because I will learn from your rating. Thank you

Posted on Nov 09, 2008

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  • 16 Answers

SOURCE: craftsman 16'' chainsaw, start with very high rpm, how to adjust ?

The H is for when your cutting,it keeps the saw from stalling. The L, is for the saw when at Idle. When the L ,is adjusted right, the saw should stay running ,and the chain should not move ,that is with the break in the off position. The H screw,should be adjusted if the saw bogs down when rev ed up. A good starting point for theses screws would be a turn and one half out.

Posted on Jan 21, 2009

  • 149 Answers

SOURCE: need initial carb adjustments for both high and low adj.

start at 1turn out on both that should grt it running from there..

Posted on Jan 31, 2009

  • 583 Answers

SOURCE: I have a Mcculloch chain saw. Mac 3216.

hi terry, here we go ---screw the H srew right in till it stops then back it out 1 1/8th of a turn do the same to theL screw but only back it out 1 turn.screw the idle screw in i turn. it is abit difficult adjusting things by holding them with one hand while you screwthings with the other,so if need be clamp the chain bar in a vice making sure the chain is not touching any thing.start the motor ,hold it at a high idle a minute or so to warm up, the n take it up to top revsand hold it there whilst screwing the H screw slowly in and out until it runs the sweetest then back it out 1/8 th of a ,turn, donot take it in past 7/8 ths of a turn . now release the throttle and let it idle do the same thing with the L screw in and out to where it idles best then set your idle speed with the idle screw so that the chain just holds from turning (that is not so important so long as it idles nicely with out cutting out) and there you have it . just watch your hands onthat chain .

Posted on Aug 27, 2009

  • 1 Answer

SOURCE: Husqvarna Model 141 Chainsaw Carb adjustment

The tool you need is available from Randy's Engine Repair, on his E-Bay store. The price is about $10., plus $3. shipping. Phone for Randy's is (937) 927-5665. It is usually busy.
Ebay item number is: 390025452838. Buy it online. I got mine about a week after I ordered it.

Posted on Sep 11, 2009

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