421 cub acting wierd

[sleeper06]

My buddie has a freshly built 421 cub,i rode the bike today ripped it around some for 10 min or so then I pulled slowly in my driveway it started acting up like it was really hot wuoldnt rev,bogging.I hit the bike with a temp gun rite away it read 123 rite by exhaust flange a little less by water jackets. Icant see it being that hot thAT HOT with that reading. I took carbs off and cleaned the pilots out thinking something got clogged. There was alittle shit in there but not much. The bike cooled down in the interm and started back up like it didnt miss a beat,my buddy rode it later on in the after noon and said it did the same thing after it was hot loss of power and smoking like a bitch. Im almost inclined to think he was rich today because it was 56 deg today usually 25deg.I also noticed a golf ball size dent in the radiator would this stop the core from functioning well enouphto cause it to run wierd.

 

 

421 cub

170 lbs compression

+4 timing

170 main

52 pilot-1 1/2 turns out

sea level 56 degrees

clean-up port on cub

 

Any suggestions wuold be great,