Clutching
- Thread starter SXlover
- Start date
just change the primary spring, whats in the sled now??
yamyrider
Active member
what machine and how is the clutch currently set up.
just look at the primary clutch, and see if its got a colored spring in it, if its a black spring look carefully with a light as they have some paint marks on them such as y/sy for an example yellow/silver/yellow, this is how they code the springs. We can tell from that what you need to change to just drop your engagement speed some.
yamyrider
Active member
yep what he said....spin the clutch by hand until you see the three little paint marks on the spring.
FuzzButt
New member
What they said but my question is why so low? 4500 is a bit high but 4000 might be better. You need to be real careful at 3500 to keep it from driving away.
Spec is 3800-4200. You should have the yellow-pink-yellow primary spring.
Spec is 3800-4200. You should have the yellow-pink-yellow primary spring.
yamyrider
Active member
there could be other issues like the clutch binding which could be a bushing.
Let us know what you find
Let us know what you find
I just went out and checked them. You guys are talking about the spring in the primary clutch (the one off of the motor) right? There is a black spring in both of them and all I could find for paint marks is a silver mark on both of them. Any ideas on how to lower the engagement of the clutch with the new info?
kysledneck
New member
same springs differant engagement.... broken spring in the lesser one!
yamyrider
Active member
the primary springs are inexpensive, you may want to try replacing it with a stock spring if you cant find the paint marks.
Yes but since I can only find the one paint mark which is silver in the middle of both of them shouldn't they both engage at the same time? Can I change it to match the other one without changing the spring? Remember both springs are the same.
yamyrider
Active member
you usually dont match primary and secondary springs. The clutched dont engage at the same time. The primary will spin and start to close which will grab the belt and start to spin the secondary.
yamaholic22
Active member
look at the primary spring again, it will have three paint marks in a line. They might be dirty and covered with belt dust making them hard to see, so make sure you clean it good and look at it carefully.
FuzzButt
New member
Best to rip the primary's cover off and order a new spring for it reguardless of what is in there. Since you want a lower engagement RPM you are going to need less preload than the spring that is in there no has. Or your clutch has something worn out in the area of the fly weights. Maybe the rollers or the bushings the weights rotate on. Either way with a sled as old as yours those parts should be inspected and replaced especially when they are not working right.
So my suggestion is get these parts from your local dealer.
White-Silver-White Primary spring (stock)
3x 15mm rollers
Possibly upon inspection for wear of the surface the roller rolls against the 8CH weights with the proper weight rivets (10.3 & 13.3g)
Start there and if it is not low enough still drop down to the W-P-W or Y-P-Y spring as both have a 30kg preload where as the WSW has a 35kg preload. Screwing around with the springs is tricky since the WSW has a lot of preload/rate/length and total force all of which are key to getting the 700's power to the track. Engagement RPM is one thing not having it shift properly at 8100-8300 RPM is another.
While your at it you might want to get 2 sets of everything so you can do the other sled. It is amazing the difference replacing worn out parts can make.
So my suggestion is get these parts from your local dealer.
White-Silver-White Primary spring (stock)
3x 15mm rollers
Possibly upon inspection for wear of the surface the roller rolls against the 8CH weights with the proper weight rivets (10.3 & 13.3g)
Start there and if it is not low enough still drop down to the W-P-W or Y-P-Y spring as both have a 30kg preload where as the WSW has a 35kg preload. Screwing around with the springs is tricky since the WSW has a lot of preload/rate/length and total force all of which are key to getting the 700's power to the track. Engagement RPM is one thing not having it shift properly at 8100-8300 RPM is another.
While your at it you might want to get 2 sets of everything so you can do the other sled. It is amazing the difference replacing worn out parts can make.
yamyrider said:
I ment matching the two different sleds on the primaries. I know how the clutch engages. Sorry if I wasn't clear on that.
Where exactly are the paint marks at? Are they side by side or like this YSY or whatever or are the on a different section like this
Y ?
S
Y
This is looking from the top of the sled down. So what you guys are saying is the one with more miles is probably worn out so it engages at 3500 and the other one with less miles is right since it engages at roughly 4500. Personally I like the 3500 engagement.
pull the 6 bolts out that hold the cover of the primary on... pull the spring out ,clean it check your color code...buy new spring... check rollers for wear of bushings, ..check the cam arms ..make sure they are the same as the other one,also if any extra or different weight has been added to the holes in the arms (or taken out.).check to make sure there is no shims added to clutch spring( the spring would sit on these). One shim will add 100 rpm to engagement. Do these checks first , make everything the same as the other and u should be good to go, if not you have other problems!
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