Roller Size Engagement Change

B

BornYamaha

Member
Joined
Oct 8, 2006
Messages
350
Location
Northern IL
How much would you expect going from a 15mm to 16mm, or even 15.6mm would raise the engagement on a xtc 500. It already has a primary spring with a slightly higher preload and stock weights. This pushed it from about 3900 engagement to about 4300 engagement. I already have the max amount of engagement springs installed. Would you expect 15 to 16 be a small like 100 - 200 rpms or something more dramatic like 400 to 500 rpms. I want to get a set to play with but I am not sure if I want to try the 15.6s first or go straight to the 16s. I know it will have some effect on the rest of the range but I will compensate if need be. If you look at an old dyno chart on this site you can see why it is a struggle to get these things to take off very hard. They have very little power on the low end. Any experience would be appreciated.
 
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get rid of your stock weights and go to 8ab weights. that have a aggressive profile and will increse your engagement. you can probley run them pretty lite. 3:16 (YAMMIE TONY)
 
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When I go to the sled specs here it says I already have 8ab weights. We are the original owners so I know they have not been changed. "98 XTC 500"
 
ok cool the xtc came with 8ab. i would not change rollers. get different spring for your primary. 4500 where ya need to be. try the srx y-w-y . 3:16 (YAMMIE TONY)
 
low engagement sounds like a sacked spring. Not putting a pile of engagement shims.
 
The original spring was a W-P-W 30 Preload/2.25 Rate. Last year I installed a W-S-W 35 Preload/2.25 Rate. It was new from Yamaha so I don't think it would be sacked but it was a nice thought. It helped some but I would like more. I only use 3 shims so I think that is the most recommended and alright. This is a "98" machine so from the info I have gathered here on TY this has the "Short Cover Primary" so I do not believe I can use the Y-W-Y 45 Preload/2.5 Rate "Tall Cover Spring" Please correct me if I am wrong on this. It would make my life easier. If I could use tall cover springs I was actually considering the B-W-B 45 Preload/2.0 Rate since the "total force" number is closer to what I have so I would think I would need to change less to keep my shift where I want it. Can you just put a "Tall Cover" on an originally "Short Cover" clutch or is there more to it than that?
 
You can put a tall cover on it with no prob Just keep your X's lined up 15.6's will up it yes.
 
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