Triple X
New member
What is more efficient to bring rpm down about 500 rpms, spring change or to add more weight?
My sled is set up with a Bender orange primary spring (55-135), stock 98 SRX 700 weights, 4.5 gram rivets inner & outer, 14.5 rollers, the secondary has a roller-rooster 47-43 helix, green spring 70 twist, trail port, V-force, air-box mod, stock gearing.
I want to take the roller-rooster off and use a Bender 9870 helix (51-43 or 50-44)? that i have. I tried this at the end of last winter and the rpms went from 8500 to 9000. I see that Advant-Edge Motorsports sells a primary spring that has the asme preload of 55kg but a total force of 110kg (yellow colour). Would the difference in total force bring the rpms back down to 8500, or should i just add wieght to bring the rpms down.
Thanx for any help!
My sled is set up with a Bender orange primary spring (55-135), stock 98 SRX 700 weights, 4.5 gram rivets inner & outer, 14.5 rollers, the secondary has a roller-rooster 47-43 helix, green spring 70 twist, trail port, V-force, air-box mod, stock gearing.
I want to take the roller-rooster off and use a Bender 9870 helix (51-43 or 50-44)? that i have. I tried this at the end of last winter and the rpms went from 8500 to 9000. I see that Advant-Edge Motorsports sells a primary spring that has the asme preload of 55kg but a total force of 110kg (yellow colour). Would the difference in total force bring the rpms back down to 8500, or should i just add wieght to bring the rpms down.
Thanx for any help!
Why do you want to get rid of the roller? Your gonna need the yellow primary spring plus more weight to bring down rpm,s. That roller works good for me.
yamaholic22
Active member
If you want to use the stock weights, that is all that you can load them with. If you want to bring them down do as you were thinking and get a primary spring with less total force, i think around a 110kg total force will be close.
Last edited:
Triple X
New member
Thanx for the fast reply guys!.
Turk, the roller-rooster works great, i am thinking about selling the SRX and i want to p
ut the rooster on my new 4-stroke. I said "thinking" the SRX works so dam good!
Yamaholic 22, i am using the stock wieghts because i want to keep the cost down in case i sell it.
Thanx again for the repiles!
Turk, the roller-rooster works great, i am thinking about selling the SRX and i want to p
ut the rooster on my new 4-stroke. I said "thinking" the SRX works so dam good!
Yamaholic 22, i am using the stock wieghts because i want to keep the cost down in case i sell it.
Thanx again for the repiles!
yamaholic22
Active member
yea if you are using the stock weights, i dont know if you will be able to get the rpm's down low enough just by changing the primary, it will be close, but might still have a little over rev. If it does, you are either going to have to get different weights with more adjustability, or add more helix angle (NOT the correct way to lower rpms)