I have a 650 Prarie and plan to go to Reno, can anyone help with jetting and clutching, would like to jet for 7,000 ft. +.

 

Call Dynojet @ 1-800-992-4993.

 

Kawi says not to change the ramp weight or spring spacer until you get over 8200 ft.

The dynojet kits say 4 main jet sizes smaller when you move from 0-3000 feet to over 6000ft (half that if you were in the 3000-6000ft elev). They also say one leaner notch on the needle.


If you don't have a dynojet:
The kawi book says use 132 front and 138 rear for the stock jets at 4900 to 8200 ft (138,142 for 0 to 1600 ft).
The book doesn't say that the stock pilot jets are any different for high elevs.

 

Sounds good to me!

 

As for High altitude jetting I found this works well. I live at 2200ft and ride at that altitude and up to 9000ft. I have tried the dyno flow jets and they didn't work as well stock jets and I am going to 142 in front and 145 in rear. I have found this set up to work well. I have for the last week experimented with the dyno flow kit and for the the higher altitudes you have to go higher in numbers on the jets. You don't have to beleive me but I have a almost new dyno flow kit you can have for a reasonable price. I have rigged up a home dyno as the one at the dealer charges me $60 a pop and 9 times on this thing gets a little expensive. I have talked Bearman and Mike Penland and they say if gain in speed and power as you go up in jets that's good. If you loose going up then drop down in sizes and play with your air screw. Turn in the screw untill the bike runs rough, then turn out the screw untill it wants to run faster. Then turn back the air screw to half way between the two and you will be set. As you go higher in altitude just adjust your air screws to compensate for being leaner. I have modified my muffler to what Nyroc has shown on his web site except I have drilled 7 1/2in holes and taken out the centre baffle on the end cap making the hole a 1 1/2in. in diameter. I have ordered an air snorkel from diamondG and I will keep with larger jets for sure. After this weekend which is a long weekend for us people in Canada, I will post all my mods I have done to the bike and I can assure you all I have improved my horsepower by 10.35% and improved my overall speed in the 1/4 mile by 2mph and the full mile by 7mph.

 

Something else I forgot to mention, about 2 weeks ago I posted a thread where I raced a new 700 3 to be exact. The only difference between my bike and stock was I have 28in Outlaws and they are some 30lbs. heavier per tire than stock. That makes the weight about the same between the 650 and the 700 with all things being equal as it were. My 650 only gained inches on the 700 and not by lengths as some people have posted in the past. I changed riders on the bikes, I rode the 700 and my buddy rode the 650 and the same thing occured with speed and times inclusive. With My mods I have done this week I intend to kick some Polaris BUTT and do some rubbing to boot!!!! As I said before I will let you now how things turn out wish me luck.

 

Thanks alltoys, great advise, are you running stock clutching?

 

read the thread, EPI black spring for P650. This should help with your clutch question.

 

I have never rejeted my prairie what tools will I need?

 

You need a 10mm socket with extension(makes it easier) and a couple short and long flat head and philips (with a GOOD tip) screw driver. And thats all