Re: puchased a rover quick start 6 months ago. No revs
Black smoke should not be coming from your air filter. If however, the smoke is coming from your exhaust this could be the result of dirt clogging your air filter and starving the engine of air, hence causing the motor to run on a rich fuel/air mix. If this is the case clean or replace the air filter element, and keep it clean. Another reason for black smoke blowing out is dirty oil in the crank case, if the oil is very dark brown to black in color or smells burnt then it needs replacing.
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Aside from changing the oil in your lawn mower, to prevent hard starts and possible complications in the future, regularly check the air filter.
Its an often over looked wearable part that can cause a bit of aggravation when starting, and possible rough running.
You want to make sure that it is not clogged with debris and not extremely dirty. You can have a fairly new filter or machine, but if its dusty, or dry where you mow, it can clog up fast.
When your air filter becomes clogged, it inadvertently chokes the engine causing it to pull too much gas into the engine which leads to flooding of the engine, and the engine not running as well or as efficiently.
In most cases the dirt can be cleaned out if the filter is not really old, and not intensely soiled.
So if your mower seems to be harder to start and it is recent, check the filter. You may be surprised.
Sounds like you have restricted the air from going into your carburator to the point the mower is just running. Change the filter and if is that dusty you to may want to put on a mask. Be careful. GOOD LUCK.
White smoke indicates that it is burning oil. The smoke would be black if it was running rich. So probably the rings will need to be replaced eventually. These mowers are prone to problems but the carbie is least likely to be the problem. So before you adjust the carbie take the cover off the top and give it a good clean and check that all the hoses are connected and are not cracked. Then make sure the airfilter is clean, blow it out with an air compessor or better still get a new one. Then try it out agian. If this doesn't help there is two screws on the carby marked L and H. Turn these only 1/8th of a turn at a time and note or make their current position. Start with the H scew with the mower at full revs. Turn anti clockwise untill you get max revs then turn it back a bit. Running too lean will over heat the motor and damage it. Then if needed adjust the L (or Low)screw. If you get black or grey smoke when you push the throttle up from idle to full its too rich so turn clockwise. If if slows before it picks up to full revs turn anti clockwise.
the carb is located under the aircleaner it sounds like the mower is being fan at full throttle this on some mowers applies the choke try ajusting the throttle to full then slightly back to open choke.
The belt hopped off likely due to grass or other things getting in-between the belt and pulley near the blade. You should be able to remove the cover on the top of the mower deck, remove the belt from the pulley under the cover, place the belt back on the pulley near the blade and then on the pulley under the cover. If the belt is shiny on the sides or you see black powder caking the inside of the cover or area's around the pulleys or the belt looks like it has chunks missing from any part of it the belt should be replaced. local hardwares, automotive and DIY centers that carry outdoor power equipment parts can match it up with the one the manual recommends using.
Tip: Keep the blade sharp, I recommend buying a couple blades so that you can always have a sharp spare installed while the other is being sharpened, change the blade as soon as the sharp edge is gone and becomes somewhat rounded on the cutting edge. If the lawn produces a lot of dust or there are lots of bald patches this will dull the blade quickly as will chopping up stick with the mower, if this is the case take steps to improve the lawn and keep the sticks picked up before you mow. Change the oil before using it in the spring and after each 50 hours of use (more often if its used in a dusty area). I recommend using a synthetic oil unless the manual specifically states not to. When mulching mow in counter clockwise circles, when bagging mow in clockwise circles and in either case overlap about 1/4 the width of the mower for a complete smooth cut. after each mowing allow the mower to cool then tilt the mower on its side opposite of the carburetor (where the air filter is) and wash off the stuff stuck to the bottom, you may have to use a putty knife on the real thick or stubborn stuff. This will reduce corrosion over the years and keep the mower running and mowing efficiently not mention it avoids blowing into the air backteria produced as the clippings of past mowing decay (it makes me sneeze).