I´m running my first setup of HC (not hammertime) with 5,3 gr in the shoulder, 7 gr in center and 7 gr in the tip = 70 gr and the white spring. Secondary clutch is stock. Engagement RPM is around 5400 RPM and top RPM around 11000 RPM. Would like to lower the engagement to approx 3500 RPM and I don´t think I need that high top RPM also. It could be a couple of 100´s lower. Could I change to the stock spring and adjust weights in the shoulder, center or tip? Any suggestions....?
Turk
Tech Advisor
Adding more weight to the heel will be quick easy & bring down rpm,s right thru the shift. Check heel to moveable shive clearence...you may have to ground off a few thou for heel clearence.
Already have 6 washers and the steel button head bolt... Is it possible to add more washers?
Turk
Tech Advisor
If you have the heel loaded to the max you have 3 choices
get a steeper helix(not recommended)
Load the weights more
Use a g-w-g yammie spring & remove some weight
get a steeper helix(not recommended)
Load the weights more
Use a g-w-g yammie spring & remove some weight
Changed to stock spring (o-s-o) and the engagement dropped to approx 4000 rpm. Top rpm also dropped a little bit. Now it´s much more smoother.... Will do some more test driving but I think this was the solution. 
powder muncher
TY 4 Stroke Junkie
You should even try a short yamaha spring, I have a 2800rpm engagement exelent ridability. This alows for great hook up befor the power hits, than hang on. I used this type of set up with clickers and yamaha weights befor on my MM700 nitro burner and now in the RX1. Just select a short spring with a similar spring rate and total force , this will be a good starting point. If you use smaller rollers you can get away with lighter weights together with the short spring this will stop the harsh engagment and engine braking .
