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Rick, Small Engine Technician
Category: Small Engine
Satisfied Customers: 3844
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
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Mountfield 454 starts easily but will only run slowly,on

Customer Question

Mountfield 454
starts easily but will only run slowly,on choke, or flat out. No sped control.
Can not see what controls the sped
Submitted: 2 years ago.
Category: Small Engine
Expert:  Curtis B. replied 2 years ago.
If you have no throttle cable, and it looks like there is none, the engine just runs one speed under use. The speed is controlled striclty by the tension on the throttle spring. The more tension on the spring, the faster it runs. The spring is adjusted by bending the spring bracket.