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How would i make a push mower engine variable speed?

Written By: Weed Eater Guy - Apr• 21•15

Question by Caleb: How would i make a push mower engine variable speed?
So i want the engine off of a push mower to use it for something else, however the only problem is is that i need it to be variable speed. For example like a weed eater (weed whacker) or chain saw where the more you push on the gas the faster the engine spins. So what is the easiest way to do this? would i just have to have a way to control the amount of air getting to he carb?


Best answer:

Answer by Joe
every mower engine has a carburetor with a throttle plate. The mower that you are using probably has it fixed so it doesnt move with a spring and a linkage to the governor. Just look by the air filter. should be some springs and a metal rod attached to the throttle plate. Just remove the springs and linkage and you can work it by hand.

However, if you want this motor to work sideways, you need to take it apart and make sure there is a piece of metal inside it that slings oil onto the cylinder the right way. The motor isnt designed to run sideways, like if you’d put it on a go kart

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  1. renpen says:

    Probably the easiest way is to get a carburetor off an engine that is set up to use a throttle cable. You can usually find mowers on freecycle.

  2. Jim says:

    There is a governor in the lawn mower engine that increases the throttle position when the engine slows under load. Disconnect the linkage to the governor from the carb (butterfly) and connect a cable directly to the butterfly instead of to the spring that puts tension on the governor linkage. Take a look at the connection, you’ll see what I’m talking about.

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