Hard to start 9N

AYWON1932 · Oct 23, 2016

I have a 9N with 12V conversion, 6V coil, there is 12v at the coil
Is this right ? New points and condenser and coil. Hard to start
turns over real good. Tow it only a few feet and away it goes and runs good. What is wrong?

Bruce (VA) · Oct 23, 2016

How many resistors are you using & what do they look like?

Will your spark jump 1/4" in open air?

What are your points gapped at?

75 Tips

Royse · Oct 23, 2016

" there is 12v at the coil Is this right ?"

That is right with the points open.
Should be about half that with the points closed.

Since it starts and runs easily with a tow you may have an
excessive drain from the starter. It might start when you let
off of the starter button in this kind of scenario.

That's not to say the starter is the issue.
It could be the wiring or connections going to it.
It's free and easy to take them off and clean them up.
Unless you break something in the process. BTDT.

There are a number of other possibilities too but I'd start there.

Welcome to the forum!

Tom N MS · Oct 23, 2016

What am I missing? 12V conversion with 6 volt coil--will need 12 to 6V resistor in wire to
coil or the coil won't last long--has it always been hard to start since the conversion??
or did it start ok for a while till the 12 volts wiped out the 6 volt coil??

Royse · Oct 23, 2016

"12V conversion with 6 volt coil--will need 12 to 6V resistor in wire to coil"

Very true. However with the points open there will be no current
flow so the resistor will not drop any voltage and you will read
battery voltage at the coil under those circumstances.

With the points closed the resistor will drop it to about half that.
I say about because it's really more about running current than
it is about the voltage measurements when running.

Dell (WA) · Oct 24, 2016

(reply to post at 15:42:37 10/23/16) Aywon........yer 3-speed 6-volt 9N uses an electrical trick called a ballast resistor. It essentually drops the 6-volts to 3-volts to make up fer the weak 6-volt battery that the starter motor drags down. Now yer hittin' the starter motor with 12-volts (it doesn't hurt it for the short time it takes to start) but once it starts yer still hittin' the 4-nipple 6-volt front mount dizzy with 12-volts. So you need a 12-to-6 volt converting resistor ...and... the infamous ballast resistor. When starting, don't pull the choke until you have 2-rumpas from yer starter motor and then a QUICK pull on the spring loaded choke should gittcha started. ........HTH, the amazed Dell

AYWON1932 · Oct 24, 2016

(quoted from post at 15:56:50 10/23/16) How many resistors are you using & what do they look like?

Will your spark jump 1/4" in open air? Yes

What are your points gapped at? 15

75 Tips

AYWON1932 · Oct 24, 2016

Thank You

AYWON1932 · Oct 24, 2016

Thanks everyone, I will be away the next couple of weeks. Will work on 9N after that

Hard to start 9N

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