Engine help continental z134

I have a Massey 202 workbull. Recently sputtering on accelerating, and was sputtering under load. I installed electronic ignition years ago and is had been running great. I put new plugs and the suggested wires on today, and adjusted the distributor. Don t have a timing light. It is better on acceleration, but still sputters pulling a disc. Does not quit, but is inconsistent. It s an hour from home. Anything I can try?

Open the high speed screw about a half round

Take a fuel sample in a clean glass from the drain in the carb bowl.

Hold it up and look for water. If there is visible water on the bottom, the
tank is contaminated and will need to be dumped and cleaned out. Just
draining off the water won't get it out if it has E10 in the tank, it is
water saturated. With the tank off, be a good time to look the valve train
over for broken springs, bent pushrods, and adjust the valve lash.

If the fuel looks good, check the air cleaner for restriction. The wire mesh
may be clogged, it's often overlooked and difficult to clean if really packed
up. It may need to have new wire mesh, not an easy job.

When you were in the distributor, did you check the centrifugal advance and
excess side play on the shaft? Electronic conversion is forgiving of shaft
wear, but only so far. If it's really sloppy it will cause erratic spark.

When it starts acting up, feel the coil, it should not be hot to the touch.
It could be failing or the wrong coil/coil resistor combo. Also be sure the
coil is getting consistent voltage from the ignition switch. Could be a
failing switch, loose connection.

Finally, once everything is checked out, adjust the high speed screw on the
carb. To adjust it, with the engine at idle, turn the screw in 1/4 turn,
quickly open the throttle, listen to the response. Keep repeating, leaning
the mix until the engine stumbles on rapid acceleration. Then start backing
the screw out 1/4 turn at a time until it will take sudden throttle without
hesitation. a puff of black smoke it acceptable.

compression

My 202 was similar - idled ok, but under acceleration or load it would sputter and run poorly. In my case getting the timing right fixed the issue.

You can time them / get them close without a light, but I couldn t get mine right until I used a timing light.