I am new to ATVs and just purchased a 700 prairie. I used it for the first time at 7000 feet where I will use it 10 months a year and experienced some carburation problem. I am sure the mixture is to rich, does anybody know what jets should I use at this altitude? The manual also talks about some belt adjustment for hi altitude, what does the belt have to do with this?
Thank you.

 

Manual recommends 132f, 138r. Don't know about the belt

 

132/138 is how they all come. Are you sure that is what is recommended for 7,000ft? It has to be lower as I recall the 132/138 being for around 1,000ft. If you have a manual it says in there....

Also, consider taking off the stock snorkle, adding some univents or other means of opening up the airbox.

The belt adjustment is actually a change to lighter primary weights and shims under the primary spring. You'll spin more rpm's and put then engine back in the power band.

You can order the weights at ronayers for about $20 each and the shims for under $2. Try two or max 3 shims. You may have one shim in there already.

 

Pancho,
My first trip to Utah (7000 to 11,500 ft) I ran the 132F/138R. My bike ran good up to about 9000ft then it started getting a little rich.
Next trip I went with 132F/135R and 6 univents open (normally have 2 open at my 1000ft altitude). The bike ran great, even at 11,500.
Much better throttle response at any speed.
If you're staying below 8000ft just go with the manual's recommendation (132/138) and maybe some univents or a DiaG snorkle.
Stock jetting is 138F/142R
Don't mess with the clutch weights.......just get the jets right and it will run fine.
Bill

 

That's what the manual specifies. BTW - mine came stock with 138/142.

 

You are right.... My bad. [img]i/expressions/face-icon-small-wink.gif[/img]

 

Bill,
Thank you very much for your advice. I totally agree with you aboun leaving the weights alone. I will go ahead and run the recomended jets for this altitude.
Sincerely
Pancho

 

Bill, one final question. I will use the P700 this hunting season at 1000ft. Do you think that the bike will be dangerously lean if I replace the factory jets for the ones Ill be using at 7000 ft.
Thanks for the advice.

 

I run my 650 at 132f 135r. Runs great from 5500-11000. At about 12000 runs like a pig. I wouldn't go any lower then 4500 with that setting if it were my bike.

 

Pancho,
In getting ready for my trip to Utah, it put the 132/135 jets in and opened up all 6 Univents here at the house (at 350 ft). Just riding around in nearby fields, I really couldn't tell that I'd changed the jets. The bike started, and warmed up just like it always does, throttle response was good, no lean "bogs" even before it was completely up to temperature.
Now I didn't pin the throttle and hold it there or anything like that, but with just general trail type riding, I think you 'd be OK (with stock snorkle and no Univents). Now if you're one to go blasting down the trails at 50-60MPH every chance you get, put the stock jets back in.

Anyway....that's my .02 cents worth,
Bill