Re: 25/35 impeller housing know-how

[johnyrude200]

The motor seemed to be running OK, but I did notice inconsistent starting, and sudden stalling much below high idle.

Having dealt with 4-5 motors with issues with this type of issue earlier this year, it is all making sense now. The motor started (the 1st time) right up, pumping plenty of water. It progressively had less water, until it eventually stopped. It also started taking longer, and longer, and longer to get to pop off and run, and wouldn’t idle down as low.

That’s because the cylinder(s) were getting full of water, and running the starter was effectively ‘purging’ water out of it, but then it started a progressive overheat because no water is making it’s way through the cooling system due to exhaust pressure.

I ran the gearcase on a drill gun today and with BARELY any RPM, that thing was pumping a TON of water (shot across the room). I could literally watch the driveshaft spin on the drill gun and water was gushing out, and I had the water tube installed to make sure it could climb the 20".

I also hooked a garden hose onto the water tube out on my lawn, and I could barely get any water to pass through the cooling system unless the hose was on full blast. It also took about 15 seconds at full blast for water to get through the cooling system (including over telltale), and that is because the entire crank case and cylinders were loading up with water first….

I pulled the plugs, and ran the motor with a screw gun on full blast for about a minute while continuously spraying fogging oil in the carb. Also pulled the cylinder head today, repeated the process, and tried hard to purge all the water I can get out of there. No corrosion fortunately.

I have the powerhead off at this point and am getting ready to pull the exhaust bypass cover and figure out which gasket crapped out. The only other thing I can think of is if the lower crank seal crapped out, but I doubt that is an issue, because the water that was in the motor today could have only gotten into the cylinders/crankcase due to the hose I hooked up to it.

Will report back later once I’m done dissecting.