135kmh is more like 85mph...[img]i/expressions/face-icon-small-shocked.gif[/img]

 

What all has to be done to change the piston and rings?How big is the job?
And the big ? How much will it cost?

 

that was with 22in tire and the rev limiter was alway in 85mp/h it's nice but i would relly like to it 100mp/h too you know compagnie that make realy small rear spoket that i can fit the ds with

 

My GPS had me going 73 mph before bouncing off the Vortex rev limit of 8900 rpm. I know this does not completely wash with the gearing calculators out there. I ran 20" haulers with 15 tooth sprocket in the front and stock rear sprocket of 40 teeth. I've tested my GPS with my speedo in my truck and its right on.

My DS, at the time, was stage II with some head work. It would take me right up to 73 quickly and then simply start bouncing. I weigh 260 lbs.

 

If you are going through the trouble to replace the piston you may as well change the cams. Heck most of the work is just getting the head off!

 

DS6502001, Kelly at KMS can get smaller rear sprockets for the DS. He was telling me today that they built a desert racer DS for a guy that will run way over 100mph. Thats just frightening!

http://www.kmsperformance.com/

 

86 MPH on a extended run on the salt flats @ 4500 ft 17-39 gearing and bad axle bearings.

 

You guys are getting some good numbers.
Are any of them for a piped and filtered bike?

 

just a modified endcap with tall gearing

 

Guys, do the math correctly. Working it out mathematically and a DS with stock CDI hitting limiter around 7200 RPM will get 72.7 miles per hour with 15/40 and 22" tyres. Lets assume those 22" tyres grow a little to 23", which the do at high speed, and you can get up to 76 miles per hour before you hit the limiter.

With a CDI that will allow you to reach 7700 RPM you will hit limiter around 78 miles per hour, 81 miles per hour with tyres growing to 23 inches.