force 125 voltage in magneto

[fisheymikey]

hi everyone,

im still having problems with my ignition.
i check resistance on all components and i receive 200v from stator.
i did see that on outbordignitionstating there should no voltage coming out from the magneto (white wire) i did find 0.5v is that an issue.
i do see the dc voltmeter change when i turn the key to the ignition.

also on my trigger i read between set 48oms. if i ground my black lead every other wire reads also the same. meaning i receive the same reading of oms. Hope that makes sense. i read im supposed to read wide open

let me know your theories please.

thanks

mike

 

[pnwboat]

Everything that you describe is normal, but I'm not 100% about the .5V on the white wire. I know that there is voltage on the white wire when running.

What kind of ignition system problem are you having? What are the symptoms?

 

[fisheymikey]

with the spark plugs out and grounded i could clearly see the spark on some plugs are much hotter(bluer). after 3 years running this engine i clearly determined i was never firing on the bottom cylinder. due to cdi.. i changed around the plugs then the #2 cylinder was not firing but only noticing the plugs how clean they were. i did a spark gap test and all 4 were jumping 1 inch gaps. only in the cylinder i was having problems. im guessing it more due to high speed miss or something like that. im also experiencing after running at high speed when i slow down at neutral the engine is reving 2000rpms. when i shut off and then turn back on it goes to regular idle. so the trigger is normal every other lead should have 49ohms to ground? thanks

 

[pnwboat]

Sounds like you may have more than one problem. The spark problem can be a bad CD module or bad CD Module connection. The CD Module connection issue is more common on the Prestolite ignition systems that use the 12 position terminal block connections for the stator and CD Module connectors. Be aware that a bad CD Module may be putting out good spark, but affecting the good CD Module preventing it from operating properly. There is an isolation circuit in each CD Module that is supposed to isolate one from the other. If it goes bad, then one module can impact the operation of the other.

The higher than normal idle rpms after running at high speed may be indicative of a "lean" running condition. Next time you experience this symptom, try pushing your choke for a split second and see if this returns the idle back to normal. If it works, I would look at the carburetor for a blockage and make sure the idle mixture screw(s) are not set too lean. Make sure you don't have a vacuum leak. Vacuum pressure differential is much higher at idle than when running at high speeds. Sometimes if the motor has been modified from the original configuration, (ported intake, after market reed valves etc.), this may cause this symptom.

 

[fisheymikey]

in regards of connections: i have redone all connection from cd,stator,and trigger.. pulled as hard as i can thus them being tight. are you speaking about location of connections. i have in total now 6 cdi modules tryed a million and one different combinations. sometimes i get weak spark sometimes one does not fire. it seams insane. thats why im trying other location in the ignition system to find the problem.

thanks for the choke idea that makes sense.

thanks for the input

 

[pnwboat]

You've probably already thought of this but for a lean condition I forgot to mention the obvious....fuel pump diaphragm.
Also fuel pump check valves and gas tank vent.