Stratos 275
New member
New to the site and need a little help. I've got a Stratos 275 PRO XL with a Yamaha VMAX 150 2 stroke. Had an overheating alarm at full throttle, outboard tail tell was discharging ok. Replaced water pump, thermostats and pressure relief valve. Still overheating alarm. Right power head hot, pulled head and water cover plate, replaced both gaskets. Also did compression test, lowest cylinder was 109 highest cylinder was 114. With motor in a tank, water pump is excellent, have water at both t-stats. Launched to put motor under load, overheated again at full throttle. Noticed steam coming out of exhaust ports. Thinking next step is to pull exhaust manifold. Inner exhaust cover was replaced about 100 hrs ago about a year ago which had minor pitting allowing water to enter dry exhaust side. Anyone else had a similar issue? Thanks.
VMAX 150
VMAX 150