I have done some testing with the clutching. I also loosened up the secondary. It seemed to drop the rpm for me. But the secondary seemed to be too active. It would be shifted up and cause the motor to bog down. It also slipped the belt a lot below 20 mph. Some times it would slip the belt up to 30 mph. So I ordered the largest fly weight rivets Yamaha had. I ordered 6 of them. My fly weights have 3 rivets in them. First I drilled out the tip rivet and replaced it with the larger ordered rivet. This helped a lot. I had the secondary in the stock location. The my girl friend and I went out for a ride. I borrowed my brothers phazer. This was really nice. That way I could compare the two sleds. One thing I noticed right away is that my XTX read a lot slower speed on the dreamometer. His read much higher. I got 92 mph out of his. My XTX topped out at 75 with the added weight in the tip. That was at 12,500 rpm WOT. Also with regular riding his phazer used around 1/4 throttle. Where mine to maintain similar trail speeds was using 3/4 throttle. His also has pulled very hard up to 60 mph. Where mine revved up and slowly accelerated. I was still not fully impressed with my clutching so the next night I removed the middle fly rivet and added the large one from Yamaha. I test drove it that night. I was much more impressed with how it performed! I was able to get 82 on my dreamometer. 12,300rpm WOT. It also required less throttle to maintain trail speeds. This was with the secondary in the stock location. I changed the suspension setup from stock to improve the handling. My sled came with the front spring rate maxed out, front skid shock maxed out, and rear spring set on soft. This had a very stiff ride. It also had lots of ski lift with a high CG. What I did was back the front shocks off to about half way on spring pressure, backed the front spring off so the spring was just applying pressure when the rear skid was off the ground, and the rear spring to hard. This improved things drastically. It cornered so much better with the front end lowered. It soaked up bumps very well. Yet it still transferred weight and picked up the skis when you wanted. Made for a very plush and fun ride. I do believe my brothers sled has a hauk clutch kit on it. With my alterations I feel my clutching is acceptable. It is as fast as my brothers if not faster on top end. But my alterations still do not pull as hard as my brothers off the line. And I still use more throttle than my brothers. So his may get better fuel mileage with the clutch kit. If I were to try more with this clutch I would want a softer primary spring or a bigger fly weight and work with smaller rivets. But I had an oops last night. While a group of us were riding I managed to catch a gate. We were riding on the trail. One of the gates to close the trail blew in to the trail. It swong out just missing the guy in front of me. But hit my sled. It was a gate on the right hand side of the trail. It hit the right side of the sled. Dented the oil tank a little bit. Cut open the right plastic panel. Smashed the battery into the brake disk. Hit the gas tank cover. Then cut through the seat. It hit my knee, knocked me off my sled, broke my helmet, and may have broke some ribs. Got very lucky. so for now I will be working fixing the damage from hitting the gate. To wrap things up I would say adding the two largest rivets to the tip and middle of the fly weights makes it much better. That's with the secondary in the stock location. It makes a very big difference. But I do feel a clutch kit will be the best performance. The weights are very cheap and easy. So if you want to try it. It may be worth your time. If I try anything else with clutching I will post it. For right now I am going to heal up and work on fixing the damage.
