1948 a misses under load on right side

dcassill · Sep 17, 2016

Distibutor ignition, changed plugs, coil, points, condenser, wires, cap and rotor, swapped carbs, checked valve lash, seems to have good compression. I cannot get this figured out. Any help would be appreciated.

Btw I got this tractor in boxes and this is how it ran when assembled. New piston and rings, valves ground.

BushogPapa · Sep 17, 2016

Is that a Heavy Load or just an average everyday load..?

Water in the Sediment bulb (Glass) will contribute to a miss..(even a little water)..

Is there any Black smoke..? Could it be running a little lean.?
Have you tried easing the chock out to see if that helps.?

What Plugs are you using.?

Autolite #3116 are the only ones I use..had way too many problems with "Champions"..

RandyB(MI) · Sep 17, 2016

Tell us what you have done while it is under load , and type of load , to determine it was not firing on #2. Would help in diagnosis.

dcassill · Sep 17, 2016

Light load like taking off in high gear. No water in fuel

NoDakInMN · Sep 17, 2016

I know you said you swapped carbs, but where is the load needle set at?

dcassill · Sep 17, 2016

Doesn't seem to matter. Tuned to wear it runs best it still misses. Maybe 2 turns

dcassill · Sep 17, 2016

Autolight 3116. A fresh set just in case

machineryman · Sep 18, 2016

1. plug 2. plug wire 3. float level 4. fuel supply

dcassill · Sep 18, 2016

Seems to be getting plenty of fuel. Been through the carb several times now

dcassill · Sep 18, 2016

By the way I forgot to mention it backfires through the intake

Ragnarok · Sep 18, 2016

May need the valves adjusted or have a bad valve/valve seat...

teddy52food · Sep 18, 2016

Leak between ex & in. in the manifold?

dcassill · Sep 18, 2016

Valves and seats where redone while head was off. Manifold has a crack in the exhaust that has been welded but is in question. Might be my next step

MSD · Sep 18, 2016

Recently had an A that ran perfect till one day it started pinging and missing. Changed coil, plugs, wires, cleaned carb, changed gas, took Petronics set out and put a set of points
in it. It started and ran but wouldn't stay running. Looked at the points again and the plastic that opens and closes them was melted. MMM now what? Finally remembered working
on one that started and ran after a rebuild but wouldn't after it was painted. Too much paint for it too ground properly. Took the distributor off and cleaned and polished the
mating surfaces and it now runs and starts as good as ever.

dcassill · Sep 18, 2016

Ill double check that. It hasn't been painted

MSD · Sep 18, 2016

Rust is what got the last one. Paint was on a restored one.

1948 a misses under load on right side

dcassill

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