Over Heating Yammie 1992 150 2stroker.

[willy]

Went down today and did some work on my V, changed filters etc. was going to go out, it was on a work station and I was running the motor on muffs, started fine as normal, after running for about ten minutes all of a sudden the overheat alarm sounded, I checked quick and the hose was going good, the pisser was pissiing so I shut her down and started checking. Pulled the cover off and felt the engine by the T stats and could not keep my hand on the heads, both sides the same, hot,
Checked for anything visible and nothing, had good oil flow. Engine was running nice, sounded real good, no missing, idled fine. Pisser was not a hard straight jet stream but was what I thought would have been a good flow. Exhaust was clean standard looking smoke.
When engine cooled down I restarted and same thing happened within a couple of minutes so I shut down, engine was again to hot to touch.
Spoke with Skools and he suggested I pull the T stats, I did and though they were definetly used they were not corroded or frozen.
I re installed covers and kept the Tstats out figuring it would run cool now, nope, upon restart heated right up, both sides the same.
The water pump was done for last season by the mechanic of the fellow I bought the boat from and has worked fine no issues till now.
I am planning on pulling the lower unit and checking the water pump out but any other suggestions would be appreciated. The fellow who owns the marina I am at said that the pump could still be bad and the pisser could still flow, especially on the hose because the hose provides pressure, but he also said that it would be unusual for it to get that hot with Tstats pulled and running on a hose and muffs to get that hot that fast.