Can anyone help me find the best starting piont for tunning this Clutch.
What weights and what spring to use.
This is for my 2000 400 scrammy it is HPD race modded with all the goodies. Ialso have the Team roller TS99 engine braking clutch as a driven.
Right now I have tried the Blue Hpd primary spring with 10-al (53g) weights. It seems like it engauges to high and the pick up isn't better its about the same. It also dosen't seem like it is putting as much power to the ground.
aside from what is in it I have 10-56,10-54,s55,Hot seat 2y,and a set of g weights. i also have the darkblue,silver,red/yellow(HPD)and brown springs.
WHAT WOULD YOU GUYS USE!!!
Tell me what works best.
I ride fast and hard mostly fire trails which are long and flat. so I FEEL THE NEED FOR SPEED!!!!

 

Is no one using this clutch anymore?? I guess it's not as good as scramblered said it is.
I KNOW ONE OF YOU CAN HELP SO PLEASE DO !!!!!!!

Wel if no one can help guess I can always reread The aaen clutch tunning book again. Maybe I'll understad it better this time.But, I realy wish that someone could give me a starting point.

 

Go with the blue primary spring and a set of 10-58 or s-58 weights. You shouldnt run anything below 55 weights with the race setup, it probably wont accelerate near as good. ALWAYS REMEMBER THIS RULE: Put as much weight to the clutch as it will handle without pulling the RPMs of the motor down while shifting out. Use the spring to fine tune your engagement. The small weight differences of the weights themselves wont cause a lot of change on the engagement, but will make a big change on the top RPM of the motor. Do you have a tach? If you do then you need to keep the motor under 7500RPMs to keep it in the "sweet spot". I persoanlly dont see why the 10-56 wouldnt work pretty good with the blue primary. The red/yellow and brown springs are good for trail mod. The only other question I have is that I noticed in your sig that it doesnt mention if your jug is race ported or not. That also makes a world of difference on tuning the clutching. But keep that first rule of thumb in your mind always when clutch tuning.Bubba

 

Thanks bubba, I'll try heaver weights 10-58s .also My Jug is race ported by HPD. I also have a darkblue and a silver spring both have lower engagement and about or a little higher full load.
Thanks though I what you said that seems to me tat maybe it will work. I don't know however because that is what I was using on my stock setup and daryl at Hpd sad he could never get it to work right.he said that i'll never get it into overdrive.

 

If it's not hitting overdrive then it would seem to me that it would need more weight. What your gonna almost have to do is keep adding weight until it does go into overdrive, then taylor your spring to match it all the time while keeping your top RPM where it should be. I know the pain you feel, Matt. It isnt easy tuning these things in. I ended up with a box FULL of weights and springs doing a lot of testing.

 

Yes it is a pain But,if I get It right I should be faster.
Let me bounce this off you, Aaen said that I might want to try a silver spring and 50s for weights , also he said I might want to try a WIDER BELT the polaris one is 1-3/16
so he said to try a 1-1/4 belt.
One more thing I noticed is that the belt travels up the sheave farther than the stock,Wouldn't that mean that I should get more top end speed?
The comet is a bigger clutch than the polaris by about 1/2 inch.
I geuss I'm going to have alot of testing to do.
I should have 10-58s and 10-60s coming this weekend.
One last thing I do have a tach a digatron egt/rpm.
Thanks Bubba

 

The clutch should be able to achieve a few more MPH because of the added gear ratio. Be a little careful of what Olav suggest. He is a master of the CVT for sure, but sometimes I think he tends to want to clutch a wheeler like they do their snowmobiles. The wider belt? I dont know[img]i/expressions/face-icon-small-confused.gif[/img] I never messed with that idea. Make sure your belt is within specs,though. A little worn down will affect performance. The comet has a little different sheave angle and is supposed to grip the belt better, hence a faster shifting clutch and transferring more torque. Since you have a tach that will be your best friend. Dont concern yourself with engagement too much unless it really bothers you. I drove my sport everywhere engaging at about 5000-5200 RPMs. But a good word of advice.... keep a good detailed log and write down every little thing you change no matter if you think it helped or not. Especially keep track of RPM changes with what combo you put in. And last but not least, try to do all of your tuning in somewhat similar weather conditions. A cooler drier air will make more power than a humid moist air, and that will affect clutch operation and motor RPMs, maybe not much but worth thinking about.Have fun! Bubba

 

Thanks DUDE!! I'll be testing it all weekend and I'll let you know how it goes
YOUR A WORD OF INFO !!!
THANK YOU!!!
MATT
TEAM BRICKTUCKY

 

Well I guess I found out what HPD is talkig about. THIS CLUTCH SUCKS!!!! It is very hard to find the rigth weights and springs. I have treid the hpd blue with 10-56,10-58and 10-60 still no luck.It engaged at around 5,000 each time the weights didn't seem like they changed much may just a few hundred RMPs but still way to high.
so I thought maybe I'll try the silver spring.I left in the 10-60 weights . with the silver and 10-60s it engaged at about 4,200. thats not bad but still to high also it only topped out at 7,200 and thats to low. peak is at 7,300 to 7,500.What should I do now!!! no matter what weight i use it seems that they don't change anything just the weights.
I called everyone Aaen,hot seat, hpd,and comet all gave no hope for me .
SOMEONE KNOW IF THIS CLUTCH IS O>K TO USE THE POLARIS WEIGHTS AND SPRINGS. the reason why i ask is because it seems that maybe the polaris springs have a higher pretention and higher load in this clutch . also i noticed that the weights make contact lower out on the tip of the weights and start more on the cruve.
Please Help OR dose someone want to buy this thing i have had it!!!!

 

Matt, I think you are getting very close to what you want. Here's the scoop. The silver has an engagement pressure of 105 and full shift pressure of 285. You say that's 4200 and 7200 for you with the 60g weights. OK: to get the top rpms up you need to change the weights. go to the 58g. That should put the top rpm right at 7350 give or take a little. You can also move to the silver/gold spring. That has a preload of only 88 and does 278 on top. The heavier-lighter weights are no going to affect engagement as much as the top rpm of the machine. I wouldnt want the engagement anything under 4000. You will lose bottom end grunt somewhat if you go any lower. Like I said before it took a long time with a lot of hands on for me to finally understand what it's all about. Grab your HPD book or hit their website and look at the numbers. The numbers wont lie to you. Are you sure your belt deflection is OK? too loose there will make engagement a bit higher also. DONT GIVE UP!!!