9N Conversion Questions

[bobthetoolguy]

I have a "40 model 9N that has had a long time 12V conversion. She didn"t answer the call this spring and while doing some backtracking, I cannot find rhyme nor reason for some of the wiring. I have "borrowed" several of the schematics on here and found them to make sense. My question is: If I convert to a 12V coil, do I need any of the resistors that are presently in the system? I currently have the white rectangular one and the original three post one. If I can switch to the 12 volt coil and clean the wiring up, I think I would be sane again.

 

[JMOR]

(quoted from post at 14:52:58 04/20/13) I have a "40 model 9N that has had a long time 12V conversion. She didn"t answer the call this spring and while doing some backtracking, I cannot find rhyme nor reason for some of the wiring. I have "borrowed" several of the schematics on here and found them to make sense. My question is: If I convert to a 12V coil, do I need any of the resistors that are presently in the system? I currently have the white rectangular one and the original three post one. If I can switch to the 12 volt coil and clean the wiring up, I think I would be sane again.

ou can use a 12v/2.5 Ohm coil AND the original 12250 ballast resistor (no need for white block resistor), ....but, why mess with what works? You might just wind up with something that does not work. "If it ain't broke, don't 'fix' it until it is broke".

 

[Royse]

Keep the original ballast resistor with a 12 volt square can coil.
Whether or not you need the second one depends on the resistance
of the coil, but most often they are not needed.
Aside from that though, did you get it running?
Changing those things before you figure out what is currently
wrong with it only adds more variables to the equation.

 

[bobthetoolguy]

I found the rectangular resistor was broken fellas. I'm going to replace that and see if she fires up. Thanks for all of your help!

 

[Charles Krammin]

You may have a good viable 12 volt conversion already and nothing is wrong with it, 6 volt coil, 12 to 6 volt (white rectangular resistor one), 3 post one (ballast resistor).
firsts check (Do you have a spark from sparkplug wire to sparkplug or to block? Do you have a spark across over sparkplug gap? Do you have voltage to coil? Are all connections "clean and making good contact". If it ran okay last year, normal its still okay, but developed some bad things, while it sat, like, bad connections, moisture, bad gas etc, and those items should be checked first before thinking about a 12 volt coil.
Borrow or buy a simple dial "volt-ohm meter" or digital meter and start checking.

Charles Krammin SW MI

 

[souNdguy]

a new style 2.5 ohm '12v' square coil and the oem resistor work good together.