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My yr 2003 115 Yamaha 2 stroke will not warm up the right cylinder bank. I have 2 analog temp gauges, the left bank reads 145F the right barely over 60. I can place my hand on the heads and its dead cold, even after 10 min of running on the ear muffs. I have replaced the thermostat and it made no difference. On the off chance I had a bad new thermostat I swapped the left and right thermostats. No change. It was suggested I change the pressure relief valve which I just did. There was a change in the design of this valve as evidently the old one used to stick. Made no difference. The only other thing I can think of would be a bad gasket on the water jacket causing a leak. I've not yanked that to check. Any other thoughts?
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