how to replace a thermostat on a Johnson 120

AK_FIREDOG

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Jul 9, 2008
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My motor is giving me headaches. Its a mid 80s Johnson 120 ARO. The oil pump is disconnected and I mix my fuel. It warms up ok and runs ok, for alittle while; then all of a sudden it comes off step. The rpms dont rev up or anything like that. I pull the throttle back to neutral, then push it forward and off I go for a short distance.

Whats funny is the **** tube is pissing away! but it seems so hot. Is it possible that the thermostat is stuck in the closed postion? How do I check that? And is it a big deal to replace it?

Any info would be of help, thanks.

Larry
 
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