Home › Forum › Ask A Member › 25/35 impeller housing know-how › Re: 25/35 impeller housing know-how
It’s probably a good thing this motor presented issues. I happened to be looking at the intake manifold with the carb off, and noticed the center screw on the manifold was missing. Then I realized that somebody installed a 20hp manifold on this 35 hp motor…the intake orifice is clearly the wrong one…so looks like I’ll be replacing that with the correct manifold!
They probably left that screw out of there to allow a little more air/fuel mixture in, but where that logic came from makes no sense to me, as that restricted manifold looks like its only about 60% of the size of the normal 35hp manifold.
So this motor actually had 4 things wrong with it…95% blockage of the telltale orifice, 95% blockage of the thermostat, failed lower crank seal, and totally wrong intake manifold (complimented with missing screw).
What’s impressive is the motor started up on the first 2 seconds of the key-on position after I tested for exceptional compression, pressure test-OK on the gearcase with lube change, and refurbished the ignition system.
As the old rules state…spark, fuel, air = RUNNING. Not necessarily right, but it ran immediately….