It sounds like the camshaft timing is off. Did you have some marks to match up when you put in the new camshaft?
I would like to know the proper way to time the camshaft gear with the crankshaft gear - John Deere Model 445
Of the 100+ camshaft replacements that I personly have done on the 425/445 and John Deere Gators I have come across 3 that backfired when completing the replacement.2 were do to bent valves coming in contact with the piston after gear failed and 1 was from a sheared flywheel key.The only other time I had this same injected engine backfire was on a John Deere gator 620i that had a faulty computer and fired @ 90 derees off.Do a compresion check and that will help out alot.
USE A DIAL INDICATOR ON INTAKE VALVE AND A TIMING WHEEL ON CAMSHAFT. After learning how and why to use these you will find out 2 things: intake valve is burned/not burned and/or 2) valve is opening too soon thereby letting combustible charge leak back into carb and fire when plug fires. Good Luck derfly
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