R-D73
New member
I've had my 98 for about 3 years now, needless to say still haven't rode it yet, it was a basket case front to back, anyways I'm basically down to finishing rebuilding the skid and getting the primary clutch set up correctly. I took apart clutch and cleaned well, rollers in good shape as are the weights. It has a blue blue blue spring in it. As of right now it won't even begin to engage until 7600 rpm or a bit higher which is obviously not correct. The movable sheave bushing is in pretty rough shape and I believe this is causing the excessive engagement rpm. Could a bushing with excessive clearance cause clutch engagement issues? I belive the weights are 8ch, which from what I've been reading is for the 97 sleds. I'm looking to set the primary up for use with an 8ch which I believe is now an 89l drive belt. Are the 8ch weights the correct ones for this? Also if someone could give a color code for a stock spring that would be great also. I believe this clutch may be trash, so probably going the route of buying a used one and putting together one nice piece from the 2 as my rollers and weights are in good shape. I'm unsure of rivets that are in weights and didn't know if there was a good way to tell what was in them or not, or if I could just put the whole weight on a scale and measure that way. Thank you for all your help, I've been reading on this for a few days now and have learned a significant amount from everyone on here. Just had a few small questions that I can't seem to find a definite 100 percent answer for. Sled is stock minus a can and reed spacers. I am putting a 1"track on with no picks in it (just installed new front heat exchanger, what a pain! ) help please!
SRXtreme
New member
Your primary spring is a short cover, but stock spec calls for a tall cover spring. This would cause the opposite in engagement rpm.http://www.totallyamaha.com/snowmobiles/aaTECH/drivespecs/primary_springs.htmhttp://www.totallyamaha.com/snowmobiles/AAATuning%20Chart/Specs.htm. you should have an 8DN belt not the 89l. The weights are correct. Replace the sliding sheave bushing and try again. You pretty much answered your own question..................SRXtreme
R-D73
New member
Thank you for the help, this is a first go with clutch work, I was under the impression that since I have a short cover I needed a short spring? I must have misunderstood what I had read on a previous post. Also do you mean by opposite on engagement rpm that it would drop to roughly around where it should be? Once again thank you I need all the help I can get, I only want to do it once! $$$$
SRXtreme
New member
The 98SX should have the tall cover, if it has the short cover you should be good with the spring you have. The triple blue is for the short cover. What I was saying in the last post was if you had a short cover with the tall spring your engagement would be really high. Measure the free length of your spring and compare it with the specs.................SRXtreme
shaggyzr2
Active member
97-99 sx's all had the short covers.
R-D73
New member
I will measure spring in Sunday, working midnights all weekend, so I should have a short spring does anyone have a yamaha part #for stock primary spring?
SRXtreme
New member
I stand corrected, IDK where I thought they came with the tall covers. At any rate with the triple blue spring and short cover your engagement should be good. This leads back to the sliding sheave bushing. Also that spring should give a real low engagement as it is only a 20 preload the W-S-W is 35.................SRXtreme
R-D73
New member
Ok good that is what I had thought, but really wasn't sure, on a big learning curve on this one. I will get some things ordered and go from there, is there any possible way to know what rivets are in the weights by any chance?
SRXtreme
New member
http://www.totallyamaha.com/snowmobiles/aaTECH/drivespecs/Rivets_Rollers.htm ...........................SRXtreme