25 hp evinrude 1995 model with intermitent miss

[goblerblaster]

My 25 HP Evinrude, 1995 model, still has an intermittent miss that I can't figure out. It will start on the first pull and most of the time run at WOT for 5 to 8 minutes and then start having little " Blip" misses. It does seem to smoke really bad when first started and then again if I let it idle after running hard for a while. Compression is 122 and 125 on the two cylinders. It isn't lugging down or dieing, just will start missing about once or twice every 5 seconds. I can slow down a little and it seems to help, but not completely stop.I have replaced the fuel pump, rebuilt the carb, changed the plugs, replaced the thermostat, put fresh gas and 50/1 oil mix, new gas tank , bulb and fuel line. It seems to me to be an electrical miss but I don't know how, or what to check next on that front. Could it be a vacuum leak problem? I can't find one of those either.Any suggestions or advise will be greatly appreciated. The model number for the motor is E25 RLEOR. Thanks

 

[jasper60103]

My 25 HP Evinrude, 1995 model, still has an intermittent miss that I can't figure out. It will start on the first pull and most of the time run at WOT for 5 to 8 minutes and then start having little " Blip" misses. It does seem to smoke really bad when first started and then again if I let it idle after running hard for a while. Compression is 122 and 125 on the two cylinders. It isn't lugging down or dieing, just will start missing about once or twice every 5 seconds. I can slow down a little and it seems to help, but not completely stop.I have replaced the fuel pump, rebuilt the carb, changed the plugs, replaced the thermostat, put fresh gas and 50/1 oil mix, new gas tank , bulb and fuel line. It seems to me to be an electrical miss but I don't know how, or what to check next on that front. Could it be a vacuum leak problem? I can't find one of those either.Any suggestions or advise will be greatly appreciated. The model number for the motor is E25 RLEOR. Thanks

Check for intermittent spark...
http://www.marineengine.com/parts/technical_information/cdi_113-4767.pdf

 

[goblerblaster]

The link sends me to a Yahoo search engine. This is a rope pull engine so I don't know how to check for voltage on the powerpack , coils etc while the engine is not running. Do you have another link you can suggest? Thanks

 

[racerone]

The ignition system works the same whether it is electric start or manual start.-----Run with a timing light to see if you can spot an ignition problem with upper or lower cylinder.