Getting alot of 325's in. Now these run great in the winter. so so much in the summer. I beleve this is because of the engine getting freaking hot due to it's placement in the chassis, Engines need cold dense air to work properly. This engine is drawing air from the front, but first has to cool the rectifier, and stabilizer before it enters the flywheel cooling fan which then pushes air into the air cleaner assembly. After an hour of run time, this air is super hot. Components its trying to cool are hot. Engine is not efficient, and surges

In the winter , the air is dense, parts are easily cooled. Machine performs fine.

Trying to figure a way to pull cool air in as apposed to hot air.

Unit is an intersting but poor design

Perhaps Miller can chime in