Question about Top-Speed Primary Clutch Mod
Sep 5, 2005 | 02:36 AM
#32
Pro Rider
Joined: Oct 2001
Posts: 1,435
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Question about Top-Speed Primary Clutch Mod
Cuda,
The clutches I do are rather radical I take off anywhere from 700 to 900 grams of material to lighten them up. I remachine a lot of clutches mostly for Europeans not so much here in Canada or the US not sure why. Well mostly because I charge a lot because it takes me 6 to 8 hours to do the work. You can remove the extra material from the sheaves and from the face plate to get the desired affect only the belt is not long enough to use the entire sheave. I will not tell how long as that I will keep to myself. A worn belt also affects the distance of how far it goes up the sheave as well. Also if you take to much off the sheaves, as much as I take off, you might find out you will lose top end speed on high range. On low range you will gain the extra speed but lose on high range. One more thing to consider is rotational mass. Tires are a major detriment to top end speed especially with cvt clutch. Still stock tires and rims are the lightest and will help to propell your machine to top end faster than any other tire wheel combo. If possible use the stock tire rim combo to judge all your runs. There is more to playing with your clutch than what has been discussed here.
Basicly if you take off 0.060 off your sheaves ( make sure you take off equal amounts from both sides of the sheaves ) you will have to take off 0.065 off your face plate contact points. If you have the time and resources take off 0.020 increments from sheaves and face plate till you start to lose speed then stop there.
The clutches I do are rather radical I take off anywhere from 700 to 900 grams of material to lighten them up. I remachine a lot of clutches mostly for Europeans not so much here in Canada or the US not sure why. Well mostly because I charge a lot because it takes me 6 to 8 hours to do the work. You can remove the extra material from the sheaves and from the face plate to get the desired affect only the belt is not long enough to use the entire sheave. I will not tell how long as that I will keep to myself. A worn belt also affects the distance of how far it goes up the sheave as well. Also if you take to much off the sheaves, as much as I take off, you might find out you will lose top end speed on high range. On low range you will gain the extra speed but lose on high range. One more thing to consider is rotational mass. Tires are a major detriment to top end speed especially with cvt clutch. Still stock tires and rims are the lightest and will help to propell your machine to top end faster than any other tire wheel combo. If possible use the stock tire rim combo to judge all your runs. There is more to playing with your clutch than what has been discussed here.
Basicly if you take off 0.060 off your sheaves ( make sure you take off equal amounts from both sides of the sheaves ) you will have to take off 0.065 off your face plate contact points. If you have the time and resources take off 0.020 increments from sheaves and face plate till you start to lose speed then stop there.
Sep 5, 2005 | 10:35 AM
#34
Pro Rider
Joined: Oct 2001
Posts: 1,435
Likes: 0
Question about Top-Speed Primary Clutch Mod
700h,
The belt isn't long enough for to much machining. Between the spring bouncing back and forth and the belt trying to get higher up the sheave you will loose speed. If you take off the belt cover and watch how the belt moves you will see what I mean. I position a digital camera above the belt housing then replay at different speeds to see how the belt operates. A few people have reported loosing top end after they have gained 5 mph, because they have taken the sheaves out to much. General rule is 0.080, 0.040 perside before the expected loss of speed. As I explained before I stretch my belt to take advantage of the extra machining that I have done for my clutch.
The belt isn't long enough for to much machining. Between the spring bouncing back and forth and the belt trying to get higher up the sheave you will loose speed. If you take off the belt cover and watch how the belt moves you will see what I mean. I position a digital camera above the belt housing then replay at different speeds to see how the belt operates. A few people have reported loosing top end after they have gained 5 mph, because they have taken the sheaves out to much. General rule is 0.080, 0.040 perside before the expected loss of speed. As I explained before I stretch my belt to take advantage of the extra machining that I have done for my clutch.
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