I took it up north this past weekend for a 3 day ride. It ran good, however 4,5,6 the clutch was slipping. I installed tusk clutches in it the day we left and I adjusted the nut behind the plate up snug to the plate. Well that must of been to close, after the first day of ridding and trying to not push the clutch I had to pull the case cover off because it started to slip in 3rd. I was able to turn the nut 1 1/2 turns back in. That helped but it would still slip when I got on it. I also put the first carb back on it. That came back the day we left. That one had the 6.0 slide in it. I had a 48 pilot and a 160 main. That carb had better response and it didn't pop anymore like the quad vent carb with the 4.5 slide with a 45 pilot and a 155 main. The first day when we hit the old railroad tracks and I started getting up to over 60mph and held it there for a couple of minutes, the engine seized right up. I stopped and let it sit while the group caught up to me. By the time they caught up and it sat for a couple of mins. I kicked it and it started right back up. Well it did that 3 times during the weekend after I had in high gear and keep on the throttle for a short period of time. The last time it did it to me, it killed while moving. I downshifted into 3rd gear and popped the clutch. The tires slid on pavement. I let it sit and once again it fired. The only thing I can think is that the crank bearings are too tight and when they get warm they start slowing down the crank. I'm probably going to send the whole motor to Ken. I just want it to run 100%. It still blew away the other machines that we brought with.