Question about Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series - Sens - A - Speed Walk Behind Mower - 10685

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8hp Tecumseh engine how to adjust carb. when I put throttle on high it sputters drop the throttle back down its okay?

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These symptoms indicate a rich mixture. Assuming the carb is the original (and therefore correct) one, and that it has an adjustable main jet, turn in the main jet adjustment screw on the bottom of the float bowl until the engine runs smooth.

If there is no adjustment on the float bowl, the carb will have to be removed and properly cleaned (ultrasonic cleaner recommended).

Posted on Oct 01, 2009

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Where can I get a diagram of carb choke and throttle linkage set up?


I bought a brand new 13 hp Tecumseh on my rider,was trouble from day one,fought it tooth and nail,finally took to shop,they put a brand new Taecumseh carb on it,couldn't get it to run,went to a dinky lawn mower shop,was told the carb was not the right one,wow,they sold me a used one that looked way different,but it worked super,so try another non-tecumseh carb or fight it forever.

Jun 07, 2015 | Garden

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Vanguard V Twin 18 hp. monted in Cushman Motor scooter, runs great at W.O.T and at on quarter throttle, misses at range inbetween


Sounds like your carb needs the fuel/air mix adjusted..uses all the gas at high speed but has excess at low speeds...find your adjusting screw and at med throttle slowly screw it clockwise until the engine starts to sputter then back it out until it starts to sputter again then continue to do this until you reach ideal mix where it runs the best it can..then go slowly through the throttle up and down..when set..unjust your idle speed screw to your ideal idle speed..if this dies not fix ..carb will bed cleaned or rebuilt. Good luck.. Note always push or pull your throttle handle slowly to position avoids gas load up causing sputter and backfire.

Mar 15, 2012 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

MTD snowblower with Tecumseh engine 8 hp stalls out when chock is adjusted to run position


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.~~

Feb 23, 2012 | Tecumseh Snowblower Snow Blower Starter...

1 Answer

Stalls when chock is in run position


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.00

Feb 23, 2012 | Tecumseh Snowblower Snow Blower Starter...

1 Answer

Oh318sa


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.~~

Jan 27, 2012 | Tecumseh Snowblower Snow Blower Starter...

1 Answer

Hi, I have an older toro snowblower w/ tecumseh 7 hp. When idling it is fine,but with full throttle the engine seems to over rev. I've adjusted the 2 carb settings to specs and it seemed to run well, but...


The carburetor settings should be to make the engine run correctly, not meet some specification. The upper jet is for idle adjustment and the lower adjustment is for high speed running. It the lower jet is too far CW, the engine will be running lean and tend to miss. Too far CCW and the engine will run 'muddy' and tend to blow black smoke from the exhaust. Throttle speed is determined by a balancing act between two springs, the governor, and the throttle position. Generally, there are several options for spring placement--a series of holes drilled in the throttle arm and the governor arm set this balance. Have the springs been replaced? Have you tried a fresh spark plug? You may require professional assistance on the throttle adjustment. Hope this helps!

Jan 27, 2011 | Garden

2 Answers

I have a vm80 8hp tecumseh engine 150092D day


If you want a 'drop-in' replacement, you will HAVE to source a carb that was fitted as original equipment. Following the demise of Tecumseh's engine division, supply is limited to 'old stock', but there is fair spares aqvailability at present. A newer 'primer start' carb will fit, but you will have to remove all the choke operating mechanism. Don't fit a carb from a larger or smaller engine - the mixture will be wrong, and the engine will never run properly.

Sep 25, 2009 | Garden

1 Answer

Tecumseh 8hp HIGH REVING! snowblower


Hi,

be careful, if the engine over revs it may just explode. These engines are very picky if over sped and easily blow up.
Your problem may be a broken throttle control rod, have look at that first. If the control rods are fine and in place it could be the fly wheel governor is worn out.

Jan 10, 2009 | Mtd Garden

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