Mac, yes it would. Samcoeds does very well in drag racing and he uses the stock spring. Lightening the clutch helps get the RPM's up.

 

why would you want to use heiver weights after lighting the clutch [img]i/expressions/face-icon-small-confused.gif[/img]

 

thanks for the link brewster!

 

prairievenom;

Weights are what make your clutch shift up. The heavier the weights the faster it will shift, the more speed you get, the faster you get it. They will also put more force (squeeze on the belt) there will be less slippage.

The problem with just adding heavier weights is the more weight, the less RPM's.

So if you lighten your clutch first, you'll gain more RPM's, then that will allow you (if you want) to put in heavier weights, those weights will bring your RPM's back down, but now you have more pickup and still have the same or more RPM's than you started with.

To make it simple it will make you quicker. if you lighten you clutch and didn't add heavier clutch weights, then you would be faster. One way quicker, one way faster, (meaning top end).

[img]i/expressions/face-icon-small-cool.gif[/img]

 

Unless you can accurately balance a clutch after drilling, your messing with fire and will get burned. Crank bearing failure will be apparent sooner. Put as much weight as possible that the motor will pull without affecting RPM engagement and top speed. The rest can be achieved by the primary spring. Do the secondaries on those machine allow for helix and spring tension changes? If so you need to experiment with different helixes as well if they are available. Auto clutches all work on the same principle. A proper split helix will allow the motor to accelerate and keep the proper RPMs on top. And just in case you didnt think I know, I always do my own clutch tuning,porting, and built my alky Sport. Dont take me wrong,please, I'm really just trying to help. Polaris keeps an extreme tolerance on clutch balancing and it wont take much to change to greatly affect inertia weight. That would have to apply to any I would think. Bubba

 

stock weights on a v are 54g,not 60 like a prairie.

Shotgun is correct, optimum rpm on a v for 300 ft is approx 6400 @100 ' 6800@200' 7000@300'

a decent time on a clutched v in 300' is 5.90(stock) , 5.70's(clutched,piped,jetted)

 

Hey Bubba, What kind a pipe you run on the LT80?Might put one on the kids.

 

Helix, can you define what you mean by a "clutched V" what exactly are you saying to do to the clutch?

Bubba, you a probably correct (I would think) regarding the crank wear, but I think that can be kept to a minimum if only used for short drag runs. For all day rides I think it is smart to keep a balanced set up of course to prevent any premature wear.

 

Shotgun and Brewster

I noticed in your face plate pictures that the V-force doesn't have a steel bearing on it like the Prairie for the EBC. I have my EBC removed so I think I will try a V-force plate out. That should save on weight and help the risk of being unbalanced! Has anyone tried this on their Prairie?

Bubba

Do you know where to get clutches balanced? I would like to have mine done. If your clutches are out of balance you will lose some HP as well as bearing wear, don't you think? You say you do it yourself, mind telling how? Thanks

 

Helix, the pipe is an FMF fatty. It makes lots of bottom end and midrange grunt but still adds to the top. Shave the head .020, port the jug slightly, and lighten the primary and secondary clutches some and you wouldnt believe the difference. I also changed the reeds and ported the reedcage. Our daughter weighs 105lbs and her wheeler runs 1 full sec faster in 300 feet than lighter kids on the stock units.

Brewster, by saying a clutched V he means that the clutching has been matched or modified to suit the particulear engine combo


Wildwill, I dont have the ability to spin balance the sheaves or spider as the polaris clutches dont need that part modified. I do use an intricate digital balancing scale when modifying the weights or to simply make a good balanced set. There are Polaris places such as RCR,HPD or Aaen that have the ability to balance them. Hope that helps.I didnt mean to barge in on this forum guys, just know that some general info on the auto stuff might be handy. Bubba