Can anyone help with top speed of an SXViper?.  I've got my speedo up to 117-122 but i dont know how fast they are stock and with a radar gun.

No I dont know what the Apex tops out at but I talk to a salesman at our local yammy dealership and he rode the 06' sleds about 10 months ago at a dealership ride and he had er goin 129 on speedometer but theyre usually off like u said with ur SRX and RX-1 but all he had to say was "wow, thats one heck of a fast sled," He went away to serve in Iraq for a while so he said hes gonna miss the 05-06 snowmobile season but onother salesman a couple weeks ago went to test ride the new 07' sleds and i cant wait to see what he says about them.  I'll keep ya posted on what the new 2007's are like according to him.

HEY VIPER,I WAS TOLD THAT THE 2003 RX1 STOCK WILL NOT DO MORE THEN 117

There was one running 117mph on radar at otis reservoir,but it was far from stock.

It was a viper!!

That same viper went 119 last week,  he writes in here his name is srx magic. He could help you get your machine to fly.

Had mine to 115 on the dream meter with a buddy who also had his apex doing the same.  Also, had  and f7 and rev 800 next to us.  F 7 has probably the most accurate speedo and he saw 102.

 got a 06 apex and the speedo is way off, it says 129  gps says 106. alot of people i know with apexs grind 2 teeth off the speedo pickup to make it more accurate.