One typical cause of a weak starting spark yet still an excellent running spark IS A WEAK MAGNETO IMPULSE SPRING or else the start timing is a tad late. It should make a loud sharp SNAP when the impulse trips NOT a faint dull clink (weak spring) and the impulse needs to trip RIGHT AT LHI TDC. If too fast she kicks back but if too slow hard to start. If you turn the flywheel the impulse must trip when the LHI is even with the flat mark at 3 o clock......... no later no sooner.
If the ignition (good spring) and timing LHI at 3 o clock with good loud sharp SNAP Id check carbs idle and adjustments. My 38 B with a Wico X Mag likes to start at slow idle on throttle and don't over choke and flood
Try a new set of the hotter deep reach side wire electrode Autolite 3077 plugs versus the 3076
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Today's Featured Article - Oliver 550 Clutch Overhaul Tips - by Greg Sheppard. I got my 1964 Oliver Model 550 (serial 141-139-519) second-hand and used it for several years before the clutch began to slip. After taking up the pedal linkage several times I saw it was going to take more than that. The engine had been leaking oil at the rear seal and I suspected
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