Issues with timing on my Odd Fire 225

Timing light shows it is timed right but after initial cranking when you try again it turns over hard like it is fast in time. Stop ad hit the key again and fires right up.
Good acceleration and throttle response but seems to surge at a constant speed above 50mph.
These odd fire engines confound me. Never worked on one until this one.
 
Both of your symptoms indicate excessive ignition timing. Hard cranking while hot and surging. If you have the vacuum advance connected, disconnect it and see if the surging stops. Make sure you are referencing the correct mark on the harmonic balancer. Some V6 balancers have two marks, one is 0*, the other is 30*. It is also possible the balancer has slipped. You can check that with a piston stop.
 
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