Evinrude 135 spark?

[ckraker]

I'll try not to make this post so long that I scare people away, and not too short, so as not to leave out any important info.

I have a 135 HP Evinrude, I think it is a late 70's engine. Compression on all 4cylinders is about 125-130. I just cleaned the carburetors and checked the timing. It starts okay and Idles okay but is pretty slow on take off and the top end speed is definately lacking. The rpm's won't get over 3500. I am almost certain that it isn't a fuel delivery problem. I've changed lines and filters and pumped the primer ball while running and nothing helps. The only thing I'm not sure on is the spark.

Could I have a weak spark??? and if so what is the way to test it? If you could refer me to another post that has answers or help me out in any way I would apreciate it.

Also I have brand new coils on all 4 cylinders and new spark plugs.

 

[jtcarter]

Re: Evinrude 135 spark?

Sounds like you might have the wrong prop on it.

 

[ckraker]

Re: Evinrude 135 spark?

The Propeller number matches the motor, we looked it up-- and i've even tried different ones just in case that is what it was.

 

[jtcarter]

Re: Evinrude 135 spark?

Sounds like your probably dropping a cylinder under load then. I'd check my plugs. Powerpack could be the culprit.

 

[jtcarter]

Re: Evinrude 135 spark?

Inspect your coils and wires, if there are breaks in the insulation might be time to replace. Put some ears on it and start it at night, if you see spark jumping from a pack or coil, might be worth a try.

 

[ckraker]

Re: Evinrude 135 spark?

I tried running it at night and didn't see any sparks jumping--- I don't know how to test the power pack--- Is there an easy way to do that?

Also Thanks for the help I appreciate it a lot.

 

[Cthom5436]

Re: Evinrude 135 spark?

Are all spark plugs firing? Are they equally hot after running the engine?