[markwil]

Hi there, I have a 74 evinrude model number 6402c c 73119. 6 hp. Last year I was having trouble and changed the fuel pump which fixed my woes for the summer. This year when I started it up after storage for the winter (with gas stabilizer)it would start after quite a few pulls but run rough at the top end. The plugs were black and very little spark so at the suggestion of a local shop I checked the coils and sure enough one was cracked. I have replaced the coils, points, condensers and plugs.After that it idled like a top and after just starting i can rev it up no problem. Once it warms up though it will still idle fine but there is no top end power and it smokes and runs rough. I have also cleaned the carb and installed a new carb kit. One thing that I did notice is that pulling the plugs out the top one is black and the bottom one is remaining white. Could I have blown the head gasket??

[sloopy]

Have you adjusted the carb jets? It takes some tinkering and time but it should solve half of the problem. You may also need to decarb your engine. I do not know about the head gasket, but it would not hurt to replace it. P.S. do you have the correct plugs in?

[markwil]

Thanks for the info. I do have the correct plugs in and as far as the jets are concerned there is an ajustment for the slow speed but the high speed I think are fixed.As far as decarbing the engine??? is that just a spray to put in and do you have to have it running ok at fast speed before you do that?

[markwil]

I was also wondering if anybody knows of a good source for owners manuals for these engines?

[DJ]

Owners manuals-no. Repair manuals-yes.Look here. http://www.outboardrepairs.com/manuals/

[markwil]

Thanks and repair manuals is what i was looking for. Just a slip of the fingers.PS I've been doing some reading on past posts and saw a few articles on crank case gaskets and reed valves could these be my problem?