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Joined: Apr 2002
Posts: 2
Novice
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Anyone know how to adjust the carb on a Murray riding lawnmower with a Tecumseh 12hp engine? There is a screw at the bottom of the fuel/float bowl and another on the side. I can't get the thing to stop surging. Please help. Thanks in advance.
Mark
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Joined: Dec 1999
Posts: 5,386 Likes: 34
Repair Junkie
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The screw on the bottom of the carby is the mixture jet open it out till the mower start to run rough then screw in till it starts to run smooth(Slowly).
Regards,
Bruce
Regards, ![[Linked Image]](https://www.outdoorking-forum.com.au/forum/images/members/mower-monsterw.jpg) Bruce Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
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Joined: Apr 2002
Posts: 2
Novice
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Bruce,
Can you tell me what the screw is on the side of the carb? Thanks.
Mark
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Joined: Jan 2002
Posts: 27
Novice
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Mark
The screw on the side of the carby is probably used to adjust and set the idle speed.
Regards Ben
[This message has been edited by Ben G (edited 12 April 2002).]
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Joined: Mar 2000
Posts: 46
Novice
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The Initial adjustments on Tecumseh carb,
Turn high speed needle(bottom)in until you just feel it touch,turn needle out 2 full turns. Turn Low needle(side)in the and turn it 1 full turn out. SURGING can be caused by several different things.>loose carb/engine screws >bad mounting gasket >water in gas >Binding governor linkage/spring. If the egine has been setting out of use all winter the carb may need cleaning
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