Push lawn mower losing power with blade.

[Drakensberg Lawn]

Hi. I have a push lawn mower with a Yamaha MT 110 engin. I just finished servicing it. It runs fine with no blade. As soon as I put the blade on it loses power and runs on low revs even if I it is on full throttle.

 

[turnerarnold]

Hi. I have a push lawn mower with a Yamaha MT 110 engin. I just finished servicing it. It runs fine with no blade. As soon as I put the blade on it loses power and runs on low revs even if I it is on full throttle.

Have you checked the gas hoses?

 

[Scrubcadet10]

You serviced it...
What all did you do?

 

[Drakensberg Lawn]

Yes I did. there is only one gas hose it's fine. I cleaned the carburetor, changed the seels on the carburetor, cleaned the exhaust, put a new spark plug, the compression test was good, did a spark test on ignition coil had good spark.

 

[Drakensberg Lawn]

Sorry forgot to mention, I also cleaned the fuel tank and hose and checked the fuel filter and was still fine.

 

[Richard320]

Lack of power under load is some kind of fuel problem.

Start by looking at the throttle linkage and the governor linkage. Nothing binding? Make sure that when you are going full throttle that the carburetor is getting the message and that the cable is adjusted right. Assuming the throttle is opening wide, then you're just starving for gas and I'd doublecheck the float adjustment. And is the carb bowl symmetric? If it needs to be aligned a certain way, that could keep the float from dropping.

 

[bertsmobile1]

Did you adjust the governor ?
IF so you have done it backwards ?
Or you have hooked the carb up wrong
Photos would help

 

[Drakensberg Lawn]

Here is a few pictures of the carburetor and the springs when on idle and full throttle.

 

[Drakensberg Lawn]

Here is the photos

 

[bertsmobile1]

In image 091732 you can clearly see where the throttle cable was originally clamped to the throttle arm , about 1/4" from the free end
Higher up the throttle stop has been bent back and is not touching the throttle high speed adjusting bolt .
The triangle tab near the bolt ( top right ) should come around to contact the bent tang behind the throttle plate when the throttle control is at the lowers or stop positon.
The screw should hit the other side of the tang to limit the top speed.
When adjusted like this the spring connecting the throttle plate & the governor arm should be almost loose at minimum revs and around 1/2 as tight as shown in the photo at wide open throttle setting.