Honda GX340 kicking back

[Cub Cadet 126]

I have a Honda GX 340 on a pressure washer . The problem I am having with it is the engine kicks back when you try to start it . It will pull the rewind grip out of your hand and pulls the rope out of the rewind handle. I checked the fly wheel key. took off the pressure washer pump, checked the valve clearance adjustments, replaced the camshaft,lifters, push rods ,rocker arms and pivots, I checked the timing marks on the balancer shaft. It has a new carburetor on it. I didn't do any thing with the ignition coil because it still seemed to do it with the shut off switch in the off position. The engine pulls over freely when you take out the spark plug.I did a leak down test on it and the valves aren't leaking. Does any one have any suggestions or run across this problem before?

[KE4AVB]

Double check that you are getting the ACR bump and that you timed the camshaft to crank correctly.