1976 135hp evinrude weird spark

[beeennny]

Hello....I have been working on outboards my whole life and I'm truely stumped. At first the motor had no spark. I unplugged the black/yellow wire with no luck. I hooked it back up. Checked the tach and about 300ish Rpms with plugs in. If I pull a plug and crank it that cylinder has spark. With all spark plugs grounded they get spark. If I put a spark plug in the cylinder that cylinder loses spark. So with three plugs in one will spark. With four plugs in and switching a 5th spark plug around nothing the second you remove that cylinders plug...bam spark in that cylinder. New stator,powerpack, rebuilt starter and all the wiring looks perfect. I would think it was the starter except its turning over plenty fast enough. Bad ground? Faulty power pack or what? Thanks,
Ben

 

[Faztbullet]

Bad battery/starter/cables as not spinnjng fast enough...

 

[beeennny]

New cables,clean starter and new battery.

 

[tblshur]

just a thought beeennny ,have you tried connecting a jumper cable from battery negative directly to the head . good luck :joyous:

 

[emdsapmgr]

You may want to qualify both the stator and timer base. You can find some excellent ignition troubleshooting info at this website: cdielectronics.com You will need a "peak reading" voltmeter to check their cranking voltage outputs vs the condemning voltage requirements in the troubleshooting guide.

 

[F_R]

Maybe I'm slow or dense, but your OP is confusing to me. Just exactly HOW are you testing the spark? You should be using a 7/16" sharp pointed gap set up between the spark plug wire and ground.
You say it is cranking 300rpm. If that is true, that is fast enough.