D2 pony motor mag no spark

The D2 and D4 do not have an impulse coupler, I don't know why. Good luck getting it going.

I think because with a rope pull it is turning much faster than with a hand crank, so it gets past TDC without problems. I have never had one fire and try to pull the rope out of my hand, but guess it could happen if you are just toying with it.

I know I’ve got a lot to learn about it serial number on it is 3J 1611. I was told 1941. It does have a belt that is hooked up to an electric starter on it. The plug wires and wire one of my think says it’s solid core but they are definitely miss matched and I took the spark plug out plugged it in and grounded it to the engine block at least that’s how I’ve done Before to get spark but maybe I’m doing it wrong.

Standard magneto Chicago Illinois spec XH1907 And this is what the side of the magneto says

I get my buddy to hold on to the wire to test it... Also disconnect the grounding switch to rule that out. Sometimes they fail closed and will ground your magneto.

Mark, the D2/D4 pony motors do not have an impulse coupling. That said, they'll spark just fine with a regular pull start. If everything's in order, just a regular medium pull will start it. So, look in to why it's not sparking. Usual easy suspects are points, condensor, plug wires, plugs. Plug wires need to be solid core.
And once it's sparking, make sure your spark is going to the correct cylinder. Has caught out more than one soul...

[quote="Neil"]Mark, the D2/D4 pony motors do not have an impulse coupling. That said, they'll spark just fine with a regular pull start. If everything's in order, just a regular medium pull will start it. So, look in to why it's not sparking. Usual easy suspects are points, condensor, plug wires, plugs. Plug wires need to be solid core.
And once it's sparking, make sure your spark is going to the correct cylinder. Has caught out more than one soul...[/quote]

yep i found out the hard way. its opposite to what you think is logical. metal plug ends are needed too i put flashy modern NGK ends on and it wouldnt spark put normal metal ends hey presto it fired.

also make sure the mounting flange faces are clean and i mean spotless. clean them with rubbing alcohol, shellite, contact cleaner (its basically shellite in fancy spray can) etc then rub a 2B graphite pencil over the faces until coated this will improve the connection between motor and magneto it MUST have a good connection to work properly. also clean the threads of the spark plug for the same reason make sure the plug ceramic is clean inside and out as this can stop the plug firing properly.

i have used the graphite trick on many antique engines with success an old mechanic taught me. the graphite fills in tiny imperfections improving contact.