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21 hp ohv

Engine changes RPM back and forth. can see governor move up and down

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  • Briggs & Str... Master
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Carb needs to be rebuilt

Posted on Jun 07, 2014

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Posted on Jan 02, 2017

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SOURCE: Poulen mower B&S 4.5hp engine "hunts" up and down

The diaphram between the carb and the fuel tank needs renewing.

Posted on Jun 13, 2009

mowerman1857
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SOURCE: mower stops when you pull the throttle back to

If you are pulling it all the way back, that is the STOP position and is normal. If you are only pulling it part way back, then your idle is set too slow

Posted on Sep 15, 2009

  • 16 Answers

SOURCE: Have B&S 4hp lawn mower (20

Hi there,

If its the 4hp classic type Briggs engine with the red primer bulb on the side of the carb then it needs a new diaphragm. Very cheap and simple repair.

see this link for a good picture + price
http://shop.jungle-busters.co.uk/epages/es122164.sf/en_GB/?ObjectPath=/Shops/es122164/Products/795083

Posted on Oct 13, 2009

  • 100 Answers

SOURCE: i cannot find any decal that tells me the the

if its a briggs motor it is usually stamped in metal cowl either on front above sparkplug or side above muffler

Posted on Aug 14, 2010

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The govenor rod cannot be adjusted. The springs are intact. Motor revs up but will not idle down. It is 23 HP.


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Rpm maxes out and I can't bring it down


check that throttle linkage is ok and free, check that throttle plate is free to move and not jammed - check that srew in the throttle plate is not allowing plate to restrict and jamb throttle

check the governor springs and links are in the correct places and are free to move , check that governor is working ?

if its not migght be governor is adjusted wrong or slipped
or its flown to peices

if unit is ohv model have seen the the ocilating balancer
torque link rod break and cause a engine to go to full throttle
as sson aas the engine was started

please let me know model and type numbers off the engine in question and its make ie briggs etc

and will try help further

cheers paul

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