Probably not that much. I wan't sure the add'l rpm would make that much difference in speed either, but you needed to remove that possibility from the equation. You may want to check your air pressure in your tires too. Low pressure could make for more rolling resistance and slow you down a bit. Next time you swap out a spring, you may want to make sure all the rollers can't move with the weights fully extended to warrant performing the clutch mod. That's the only thing more I can offer.

Hey there Simonsez:

I didn’t want to jump in on this post but; if I was you and my machine was brand new with 90 miles it I would put all of the stock springs and anything else you did back on!

Now with it all back to stock I would take it out and try a speed run ,if after that your machine doesn’t pull evenly all the way up to speed I would put it on the trailer and take it back to the dealer and tell him the problem!

Now with that said if you are going to fix it yourself I would start by first finding out what rpm your machine is making the most power. (Someone here or your dealer should know) you need to get your machine to run at that rpm until you shift out.
While my experience has been mainly with snowmobiles the clutches works like this:
The springs, weights in the primary or driven clutch work mainly to control engine RPM’s and the secondary clutch controls how aggressive the up shift is.

There is a BALANCE between all these and when you change one thing you have to change another. Hence you may have to make a secondary change with the heelclicker.

Without getting into it: Clutch kits that you find for Quads generally raise engagement and RPM’s with higher spring rate this is to help get machines with bigger tires going quicker but there is a trade off in top speed!

I had a 2001 sp500 and it would do 55-60 all the time loaded heavy, my new 2005 sp700efi will only do around 45-50. I know my 05s driven clutch is the same as a 800 but not shure about the new 500s, they changed the design of it late of 04, so far a person on the threads have helped me with the take off, look for (top speed twins), I think the driven clutch spring needs replaced but have not found anybody that makes one.

your new 700EFI should be doin about 65 to 70

my 600 went 60-63...(speedo)...the 500 H.O.'s are faster with less torque and should go around 65...my friend has one and it does 65 ish...(speedo)...i put my mudlites on it an it still hits 60...although once it would go fast and then i adjusted my valves and it woke it up again...so try your valves....but their kan be a great number of reasons for these problems...rev limiters, valves, springs, possible regrease clutch, even chek for water in the clutch....best bet is to take it to the dealer...some peolpe could argue about how you broke it in...to many possibly problems for us to make a call...srry...[img]i/expressions/face-icon-small-sad.gif[/img]