clutching how to? (xp)

[Smoke Show]

is there an xp clutching how to, so i get the general understanding.

i adjusted the clutching a lil bit on my 670 but honestly i just did what someone told me to... i really don't have a clue.


thanks

 

[winter brew]

Get Cutlers clutching handbook and Olav Aaen's clutch tuning book.

 

[Summitseeker]

This video from Cudney Racing might be some help to you.

http://www.cudneyracing.com/ClutchVideo.html

 

[stonehands]

I second the Aaen book best 20 bucks i spent for clutching knowledge.

 

[Shake]

Here is a good link with a lot of general clutching info.

http://www.dootalk.com/forums/index.php?showtopic=102968

 

[Red-eye]

Get Cutlers clutching handbook and Olav Aaen's clutch tuning book.

Im just trying to learn here. I have seen a lot of info on gearing the xp lower. Now OLav Aaen's clutch book comes into play. In that bible of a book it states that at one to one ratio ( approx. ) the clutches are the most efficient. When I gear down the belt in the primary goes up past it's efficient spot to overdive. My 07 rev had 21/45 gearing and it ran fine with less horse power. Now we are supposed to gear down a sled that has more hp, less weight, and a roller secondary. Sorry I don't buy it. Another bandade instead of proper clutch alignment or engine flexing, or jack shaft movement. There is something not right. Please Some of you riders seem to have your marbles in the right place, any thoughts?

 

[Red-eye]

Im just trying to learn here. I have seen a lot of info on gearing the xp lower. Now OLav Aaen's clutch book comes into play. In that bible of a book it states that at one to one ratio ( approx. ) the clutches are the most efficient. When I gear down the belt in the primary goes up past it's efficient spot to overdive. My 07 rev had 21/45 gearing and it ran fine with less horse power. Now we are supposed to gear down a sled that has more hp, less weight, and a roller secondary. Sorry I don't buy it. Another bandade instead of proper clutch alignment or engine flexing, or jack shaft movement. There is something not right. Please Some of you riders seem to have your marbles in the right place, any thoughts?

Hard to believe there are no thoughts on this. Thought someone would have some ideas.

 

[winter brew]

Im just trying to learn here. I have seen a lot of info on gearing the xp lower. Now OLav Aaen's clutch book comes into play. In that bible of a book it states that at one to one ratio ( approx. ) the clutches are the most efficient. When I gear down the belt in the primary goes up past it's efficient spot to overdive. My 07 rev had 21/45 gearing and it ran fine with less horse power. Now we are supposed to gear down a sled that has more hp, less weight, and a roller secondary. Sorry I don't buy it. Another bandade instead of proper clutch alignment or engine flexing, or jack shaft movement. There is something not right. Please Some of you riders seem to have your marbles in the right place, any thoughts?

The newer TRA's are a smaller diameter than they used to be, the overdrive is gone....full shift is REAL close to 1:1.
Gearing lower puts those clutches closer to 1:1 when climbing/under a load than taller gearing. Gearing down is not always the answer, but it usually helps reduce excessive heat which also adds to efficiency.

 

[MURDOCK]

Im just trying to learn here. I have seen a lot of info on gearing the xp lower. Now OLav Aaen's clutch book comes into play. In that bible of a book it states that at one to one ratio ( approx. ) the clutches are the most efficient. When I gear down the belt in the primary goes up past it's efficient spot to overdive. My 07 rev had 21/45 gearing and it ran fine with less horse power. Now we are supposed to gear down a sled that has more hp, less weight, and a roller secondary. Sorry I don't buy it. Another bandade instead of proper clutch alignment or engine flexing, or jack shaft movement. There is something not right. Please Some of you riders seem to have your marbles in the right place, any thoughts?

I have read some of turboal's posts and he claims taller lugs and harder duration rubber is to blame. Although the new tracks are lighter it is believed they are harder to turn. This being said he does not recomend gear changes but a 50lb stiffer finish on secondary clutch. I wonder how a 2'' track would perform on an XP. Some claim a 15'' wide is the ticket.

 

[Red-eye]

Good points, I agree the track does contribute but not that much. measured a TRA from a 87 formula today and the dia. was only 1/4 in. difference than my 08 xp. still lookes like some what of an overdrive. Did some checking today and found lots out with my 08 xp. going to start another thread.