[posted and mailed]

" Rob Mcgee" wrote in
:

recently swapped out a blown 12 horse engine for a used 12 horse. It
workes fine with the blade down, but it surges with the blade up. does
anybody have any ideas.

--
Rob in the U.S.A.
no matter where you go there you are





Check that the blade belt is engaging and disengaging correctly.
With the blade down, the engine is under load. When you lift the
blade, it is supposed to turn the blade off, which would take the
load off the engine. If it is working correctly, then you probably
need to either adjust or clean the carb, or if it is a Tecumseh,
you may need to adjust the governor, as they can loosen up occasionally.

Matt
30 years in Outdoor Power Equipment repairs.