35 evinrude missing

[dew2]

I friend has a 35 Evinrude 1980. The lowspeed trolling works great 3/4s full throttle runs fine, but open it all the way and there is a bad miss.The compression is 100lbs both cylinders,new plugs,New fuel line,Spark at starting jumps 7/16 inch bright blue zap.
I need suggestions the motor is 300 miles away,He tried everything I could help with. Thanks for replies!

 

[boobie]

Re: 35 evinrude missing

Just guessing, maybe a bad power pack with out checking out when the prob occurs with the proper equipment.

 

[gus-gus]

Re: 35 evinrude missing

The title was a touch misleading. I am glad it wasn't "missing" but running rough. Good luck.

 

[dew2]

Re: 35 evinrude missing

Just guessing, maybe a bad power pack with out checking out when the prob occurs with the proper equipment.

Are you sayind a multimeter with a DVA check? Will it show a bad pack at low speeds even though the problem occures at high speeds?

 

[boobie]

Re: 35 evinrude missing

For high speed misses a timing lite or a cyl drop test work the best. That way you can narrow it down to which cyl/cyls is giving you the prob. The DVA is mainly used for cranking output tests.

 

[Home Cookin']

Re: 35 evinrude missing

simple as this is, pliers-tighten the battery ground. Worth a try.

 

[steelespike]

Re: 35 evinrude missing

Is that skip bad enough it feels like you hit something?

 

[boobie]

Re: 35 evinrude missing

Battery ground has nothing to do with the ignition system on this mtr.

 

[dew2]

Re: 35 evinrude missing

Is that skip bad enough it feels like you hit something?

No, Well actually the motor isnt here I am communcating with a friend 300 miles away,The lower gears and dog are new.

 

[AlTn]

Re: 35 evinrude missing

voting with boobie...an inductive timing light on each sparkplug wire in turn will best diagnose what sounds like an ignition problem..or eliminate the ignition as the source

 

[dew2]

Re: 35 evinrude missing

voting with boobie...an inductive timing light on each sparkplug wire in turn will best diagnose what sounds like an ignition problem..or eliminate the ignition as the source

Thanks guys! Hopefully this will find the problem with out throughing parts at it.

 

[Home Cookin']

Re: 35 evinrude missing

Battery ground has nothing to do with the ignition system on this mtr.

true dat. i stand corrected