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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.~~
Hello Darrick, So you have a snow flite by M T D that is canada made model # 311951500, have been all over the web and can't find a manual for a 12 hp 30' CUT,you are going to have to contact a snowflite dealer for this,when you find the manual please let me know where you find one so i can pass this on to other customers,thank you,
The most common cause of this is the drive belt is worn or broken. Sometimes the drive cable stretches (from the handle to the trans) To check the belts and tension you remove the cover (usually plastic) in the middle of the snow thrower to look at the belts. Your operator's manual will show you how to remove the cover and check/change the belts. If you don't have a copy you can get the manual through managemyhome.com You will need the model number off the snowblower. It is usually located on the bottom right hand corner of the frame (from the handle side) The model number looks like 247.123456. The belt closest to the engine drives the transmission. With the engine not running, have someone depress the drive lever and check the belt. You should only be able to depress the long side 1/2 inch or less. More than that the belt has stretched and needs to be replaced. On some older blowers you can adjust the tension pulley, but most made in the last 15 years, you can't. The belt may be frayed on the edges or glazed causing it to slip (it is shiny on the sides of the belt) It may be torn and broke completely. You can get parts for your Craftsman and most MTD made models through searspartsdirect.com or jackssmallengines.com. If you are unfamiliar with repairing machines you can get your MTD snow blower repaired by taking it to your local Sears. They will have a technician troubleshoot and repair the unit. Feel free to ask any other questions. I know Snow Blowers. Please remember to rate this answer!