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I took my 16' custom out on a local chain of lakes yesterday to test out my new prop and find out my top speed, the main lake was pretty busy so I never got to get a good run at top speed. I opened it up a few times, but for the most part I was just planed out and cruising about 17-20mph, I was also going in between the lakes with a lot of going through no-wake zones. After about three hours I pulled of into the smallest lake just putting along when my alarm went off, there was a water stream coming off the motor and it was warm but not hot.
I dropped anchor for a few about an hour and did some fishing and let the motor cool down, I putted back out to the main lake and started to run back to the launch at WOT. About 30 seconds at WOT, the alarm went off and I brought it back down to around 900 RPMs. When I checked the water stream it was hot, hot enough that if I left my hand there for more than a few seconds it would start hurting. So I headed back to the launch at about 900rpm, I noticed the steam of water was to get broken up. The first time I took it out the motor over heated after about three hours also.
The motor is a 1996 Evinrude E90ELED with about 35 hours on it. I'm planning on replacing the impleller; which I probably should have replaced it to begin with, being the age of the motor with the amount of hours it has on it. Aside from replacing the impeller what else should I be checking?
If the water pump and t-stat are not the cure you may have a bypass valve to allow full flow at high rpms like my yamaha's that may need to be cleaned out or replaced.Some engines use the t-stat as the valve and would have a spring on the stat to allow it to raise up and allow full flow.Just a thought.
