jgustman
New member
Does anyone know how much rpms will drop when 1 gram of weight is added to the inner hole on a 8DN20 weight and will it drop rpms during acceleration or just at full shift out. I have a problem with the sled pulling 8700 out of the hole and reving to 9200-9300 near top end. I have a HC-X roller secondary and 42-34 helix. I believe either more inner hole weight would help, but I don't want to pull down the revs on acceleration any further.
tripple_tripple01
New member
ask turk, he really knows these yamaha clutch's
2.4 gram rivet in tip should get ya very close. Leave the 1st hole alone & even with a 2.4 in tip you mat have to slightly lighten the 1st hole.
jgustman
New member
I didn't explain that this is a 2001 SX 700R with Hauck tripples that are suppose turn 9000-9100 rpms. It is pulling 8700 out of the hole and climing to 9200-9300 when shifing out. I have 4.5 rivet in the tip and the inner hole empty. I'm asking if adding weight to the inner hole is going to pull the hole shot rpms down further along with pulling down the top end rpm.
Ummm....I would balance the weight between the holes better. You might want to try moving some towards the inner & lighten up the tip. with all the weight at the tip it is hard to get a balanced shift. The centrifugal force will push out the heavy tip very quickly & you get an initial fast shift & then rpm,s will catch up.I don,t like setting up a clutch like that...I prefer tuning from the inside out with a low finish helix.
jgustman
New member
If it is under target 9000 rpm initially, then begins to over rev at approx. 50 mph., then wouldn't you say adding weight to the inner hole would only pull down the rpms further upon initial takeoff and still over rev if you lightened the tip? Or the second senario of just leaving the 4.5 gr in the tip and adding 2.4 in the inner hole make matters even worse off the line, but pull down my shift out rpm's closer to 9000. It looks like I need to pull out the HC-X 42-34 helix and install the straight 42 and probably lighten the 8DN20 weight or use the stock 8DF weight/rivets the sled originally came with which is about 2 grams lighter than the 8DN20 with 4.5 gr. rivet in the tip with the inner hole empty. According to Supertorquer, the straight 42 helix is suppose to act like a progressive 48/38 on upshift and straight 42 on backshift. I cant quite figure out why they made a progressive 42-34 if the straight helix already acts like a progressive helix. Am I on the right track?