I've got an '85 15 HP Johnson manual start that's had less than 20 gals. of gas run through it over the years. It used to run great. I've got new gas, gas tank, hose, plugs, and fuel pump, and the carb has just been cleaned and treatment run through the cylinders by a Johnson mechanic who said the compression seemed low (i.e. - he could easily turn flywheel by hand). Now, it starts fine at first, but then surges at WOT (i.e. - when warmed up) and then will die and be difficult to restart. Help! I'm no mechanic and my mechanic would like to sell me a new one!
<br /><br />Sounds like a fuel supply problem to me. Check for restrictions in the fuel tank vent and in the fuel supply system.<br /><br />You can confirm that it is running out of fuel by spraying some fuel mix into the carb when it is trying to die. If it perks up you have confirmed the cause.<br /><br />Good luck, and let us know what you find. 
