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Discussion Starter · #3 ·
Thanks GC, problems are:

Ski runs fine at speed. Good jet out of telltale vent on left side.

When running at slow speed ( 3 mph) ski will overheat after 10 -15 mins. Temp alarm + steam out of telltale.

Running at slow speed and when flushing on trailer, only occasional spurt of water from telltale.

Ski has been to dealer and cleaned/flushed....nothing found and is no better.
Any ideas ? :)

Was going with the blurb from Yamaha brochure that says:
Thermostatic and Pressure Controlled Cooling System: Water flow through the engine is controlled by a thermostat and pressure system and is maintained by a pressure control valve
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