Hot spot from carbon build up was uncles problem- but since you put in new cran and pistons the head should have been cleaned. Try to use fuel shutoff drill instead of ignition off and see if that helps. WD45 crank was stroked compared to wd- 4.5 instead of 4 inch. What rods are you using? the old WD rods? WD45? Need to double check but rod length was a tad shorter on the later WD45? means the older rod and newer piston rated for 8.5 to one is actually pushed up higher in cylinder and compression is 9.5/10:1 or so and dieseling occurs. IHC with Firecrater or high altitude pistons got same problem sometimes- H and 300 rods had about thickness of bearing shell difference- AC WD/WD45/175 may have same situation. Valve edge may be "sharp", that can develope hot spot also. RN
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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