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B&S up and down in revs?

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#1 OFFLINE   AETD

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Posted 08 May 2012 - 11:41 AM

Can anyone tell me what is the problem when the engine runs like this.
(my neighbours murray with 12Hp B&S)

with lever low the enige runs smooth.
with lever high the revs starts to go up and down.

i allready cleaned the carb

te right arm (governor?) is pushing the throttle up and down.


youtube vid.


#2 OFFLINE   TT-(Moderator)

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Posted 08 May 2012 - 02:11 PM

Have you tried adjusting the main jet needle? It's the one that points straight down out of the bottom of the float bowl nut.

Terry
 


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#3 OFFLINE   AETD

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Posted 08 May 2012 - 02:47 PM

Jep i did, when i turn that open (now it is about 1 and 1/2 turn open) from 2 it starts shooting flames true the exhaust when rev up and back to idle. ;-)
spark plug have the right color so i think mixture is good.

when i hold the arm i can feel it pushing.when u put a small screwdriver inbitween, it runs normal... I'm starthing to think the governor have a problem.

no wthe engine have not enough revs/power to mow.
riding is just possible but it's like riding a camel. (lol)

#4 OFFLINE   Rooster

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Posted 08 May 2012 - 03:44 PM

Governor spring needs replaced is a common cause of that.
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#5 OFFLINE   AETD

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Posted 11 May 2012 - 12:51 AM

New governor spring did the job.

thanks





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