JD 212 starting issues

[JD Ray]

Hello, my son is all about John Deere 200 series tractors, he's 13 so we restored his 212 we didn't rebuild the engine, but we did replace the points, spark plug, condenser, coil adj. the valves new oil change new battery and terminals, rebuilt starter he rode it in the local tractor paraded he used it around our place well now when he goes to start it the starter, "bucks" it will turn and stop then it turns and stops when we remove the spark plug it cranks steady put the plug back in it goes right back to what we call buck only cranking steady when the spark plug has been removed so have we got an ignition problem do we need to readjust the valves can anyone please give as some direction. Thanks

 

[olcowhand]

More than likely the valves are out of adjustment as when too wide a clearance stops the camshaft's automatic compression release from working. Set valve clearance to spec and I'd bet it turns over and fires up fine again.

 

[olcowhand]

If valves are within spec, then your auto compression release may be broken and would require pulling the camshaft to replace. It is fairly rare for the compression release to break, but does happen.

 

[Propane1]

Just a guess, but the timing could be to far advanced. Reset the points to 0.020. And see if that does any thing.

Noel

 

[Sawdust]

Welcome aboard I would suggest the same. Try the points adjustment first only because it would be the easiest. My guess would be your valves.

 

[esbbent]

Along with valves and timing, also check your starter mount bolts. I had a tractor do that and the starter mount bolts were just 1/2 turn loose letting the starter move and bind up.

 

[dodge trucker]

I've had that happen with weak battery, bad connection, etc.

 

[JD Ray]

You guys are the best. We will check the points, and most likely the valves too. Thanks Guys