Tweet
I have a C25MLHT that i recently purchased from a dealer. The compression (118 - 112) and lower unit were checked out as well as a test run by the dealer. After about 1.5 hours of run time the engine slowly lost power over 10 min. until WOT was about 3200 RPM. With the engine I also purchased a new fuel tank, fuel line, fuel filter and in line water separation filter. The motor ran great up until the problem. It starts and idles well. The plugs were new. I replaced just to see if it made any difference. No change WOT 3150. No crud came from the drain screw under the bowl.The water pump seems to be putting out a good stream. The primer bulb seems to stay firm. Opening the tank and putting pressure on the primer make no difference. The fuel is new and mixed 75:1 at the suggestion of the dealer. As I have no history for this engine other than the last 1.5 hours of run time I can't tell you any more about it. I am looking for ideas from experience. Are there any tests I can do to start narrowing this down? Thank You for any help in advance.