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I tuned up my toro z5035 plugs filter &oil change. after starting the mower iit was running very rough & blowing black smoke from the exhaust . i pulled the plugs 1 of them was covered in a bl

I tried relacing the 1 plug that was covered in the black soot & it fouled out just as quickly. when i adjust it to high idle it does not rev up very high & black smoke billows from the muffler

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 4.5hp Brigss & Stratton engine.Engine runs rough.

Ok, check the air filter, it could be clogged. A clogged air filter won't allow a proper air-gas mixture. Then check the carb. make sure that it is clean, or if anything doesn't look right. You might have to get another carb. After that check the intake it could be clogged but this time a clogged intake means that there isn't enough fuel getting to the combustion chamer.

Posted on Aug 12, 2009

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woobie dog
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SOURCE: my lawnmower starts fine but runs rough,it does

Hello.

Replace the air filter. This could be the source of your problem.

Best regards, --W/D--

Posted on Apr 29, 2011

motor1258
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SOURCE: Lawn Mower runs rough & dies has black sooty spark plugs

A good place to start would be to remove air cleaner assembly and give it a good wash and service and take a close look at choke assembly/lever to be sure it isn't sticking in on position, while trying to run it with air filter off..

Posted on Dec 05, 2011

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SOURCE: I have a 10 year old Craftsan yard tractor with a 17hp OHV Kohler motor. Went to start it up and it started up fine, belched white smoke and stopped running. Looks like there is oil leaking into the

check the oil see if it smells like gas sounds like the needle valve in the carb is not seating and the carb over flows into the crankcase

Posted on Aug 26, 2012

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SOURCE: a 450 series 148cc on a victor, mower starts but runs rough(low engine rev and blows black smoke)

There has been a great deal of issues with the diapham between the carb and the tank, replace it and hopfully all will be well again.

Posted on Mar 10, 2013

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Powermore 173cc OHV - suddenly running rough burning twice as much fuel as before. Blowing black smoke out of the exhaust. Is there a float that might be stuck open?


It.sounds like you have a hole in the float. If the float was.stuck, the oil would be filled with gasoline. With a hole in the float, the engine would flood, blow black smoke and run rough. Remember, black smoke is fuel, white smoke is water, and blue smoke is oil. Hope I helped.

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John deere 445 96 w 22 horse kawasaki fuel injected starts fine runs but rough with raw exhaust gas new olugs new fuel &filter new oil


When it runs rough is it blowing dark smoke? This is a sign of running rich like a choke will do and can cause stalling especially when the motor is warmed up. If it is not blowing dark smoke it sounds like maybe your injectors are not working properly and it is not getting enough fuel through them under load. either way as an injected machine it sounds like injectors may be the culprit since youve taken care of some other issues. You might try running a heavy dose of an injector cleaner through it (I've had good results with lucas brand) and see if that helps. Otherwise, you might try to manually clean the injectors.

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