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I need the manual for a b&s 7hp #143-666382

I need to adjust the govenor on my snow blower Sears# 536.909700

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Hello ,your engine is a tecumseh HMSK90-156525D, Sounds like carb. may need adjusting. Take the heat box off to expose carb. the heat box is the metal box surrounding the caeb., there should be 2 adjustment screws- 1 on the bottom of the bowl and 1 on the side of the carb just above the edge of the bowl ( depending how the carb sets off the engine - if the carb comes straight out it will be on the side facing towards the front of the snow blower or if it goes towards the handles then standing other side of the snow blower the screw will be facing you), turn both screws in til they just bottom out the turn them out 1 1/4 turns out then start the machine. While the machine is running at low idle turn the screw on the side of the carb. in (clockwise) a little at a time listening for the engine to start to rev up and then start to rev down, bog or studder then turn back slightly to bring idle back up. Once the idle is up then the screw on the very top of the carb. turn that out to lower idle to a normal idle. Repeat those adjustments till you cant get the idle to go up anymore. Now for the screw on the bottom of the bowl- move the throttle up to max and turn the screw in till you hear it rev up higher and starts to bog or sputter then turn it back slightly to bring the high rev to a smooth rev. That should take care of it. If it does not solve it then the carb may need cleaning then the adjustments done again. If you need more help on this please feel free to ask. Sometimes you have to do process of elimination and you start with the easiest first. Also the adjustments should help with the carbon build up on the plug.692509.pdf (application/pdf Object)
i have included the manual to give you a good understanding of the carb, page 7 to 25, hope this helps,don't forget the 4 thumbs up,any comments welcome,thank you.~~

Posted on Feb 20, 2012

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Posted on Jan 02, 2017

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SOURCE: can't keep my snow blower running under load,

there should be an ajustment screw on the carb. turn it all the way in don't turn it hard then turn the screw back out 1 1/2 turn to start out with then after runing turn till it runs evenly.

Posted on Dec 22, 2009

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