1994 Johnson 150 running cold

by Don
(Bethany Beach, DE)

I have a 1994 Johnson ocean runner 150 that is running cold. The thermostats are ok and it get up to temp at Idle, however as soon as you bring the rpms up to around 2000 the temp drops off to around 100. This occurs on both sides of the engine. I tried putting in the larger thermostat springs but then the engine runs up at around 180 or 200. Anyone have any ideas

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