Outdoor Power Equipment and Small Engines - Briggs & Stratton Quantum XM 4.5 hp
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Jakester
09-06-07, 09:27 PM
I am having trouble with this motor starting and idling.
It only starts with 3 good pumps of the primer button, puffs blue smoke once, and runs. This is a minor problem.
Once running, it doesn't hit full idle speed but surges up and down. If I physically hold the external component of the throttle plate, it runs smoothly at higher RPMs. I notice there is a spring and small rod connected to either end of the external component of the throttle plate. How can I get it to run smooth? Is it the spring, or is there a vacuum/inertia component that needs fixing?
Thanks,
Jakester
It only starts with 3 good pumps of the primer button, puffs blue smoke once, and runs. This is a minor problem.
Once running, it doesn't hit full idle speed but surges up and down. If I physically hold the external component of the throttle plate, it runs smoothly at higher RPMs. I notice there is a spring and small rod connected to either end of the external component of the throttle plate. How can I get it to run smooth? Is it the spring, or is there a vacuum/inertia component that needs fixing?
Thanks,
Jakester
cheese
09-06-07, 10:18 PM
Sounds to me like you need to clean out the carburetor. Remove the carburetor bowl screw and note the tiny holes in it. Clean these out as well.