D2 pony motor won’t run on both cylinders

Hi Tad7561,
Have you tried putting in new plugs in as the can fail under compression, they may work fine when it is taken out but not under load.

Regards

I’ve swapped plugs and wires from working ponies and still nothing

How about high tension leakage? Either in the cap or wires? Have you tried turning off the gas, opening the head drains and cranking until it fires? That what I do if I mess up and flood the engine. The left cyl seems to get crapped up more easily. I understand is common for the same cylinder to fire first,I know mine frequently does.

The few times it starts on one cylinder is when we open gas for few seconds then shut it off, then after about 100 pulls it will pop off on one cylinder. We have also tried it with drains open and still only fires on one cylinder.

Had this issue ,drove me almost insane .. turned out be the cap tracking seems like the spark is still there, but its not at the right time !!
Did a valve job and rebuilt the carb made no difference fitted another cap and it ran like a top !!... hope this helps ...

Thanks I’ll pull the cap from the D4 if that fails to be it I’m dragging it with the TD6 into the building

Check you don't have a rag down the intake manifold runner to that cylinder

It takes more ignition energy from the mag to fire under pressure. My vote is weak spark- - bad condenser, bad mag coil, bad points, low magnet charge.

Swap mags.

Don’t have a spare mag to swap, cap didn’t make a difference still won’t start.