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Old 07-16-2012, 04:46 PM
curiousman curiousman is offline
LawnSite Member
Join Date: Jul 2010
Location: potts, tx
Posts: 3
fuel cap causing loss of torque under high load (running lean)

Spent a couple of days before I found the fuel cap was not letting enough air through when mowing tall/heavy grass.

Probably will replace fuel cap once a season now, to reduce chance of running too lean some of the time.

Fuel cap appeared to be clean on top & bottom. Air hole was clear. Finally tore cap apart & found a thin film of silt on all the internal parts. (about 240 hours run time)

I know I should have checked it sooner but appeared to not be clogged when looking at it & cylinder #1 had lower compression than #2. Replaced head gasket, but still had loss of power under high load. Then found fuel cap was the problem.

Deere 757, Kawasaki 25hp
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