Guys I was wondering somethig. I Live in Texas at 0 elevation, but now I'm going to college in Laramie Wyoming, we set at about 7500ft. The mountains are about 9000ft. The question at hand is, if I bring my four wheeler up here on Thansgiving break will I have to re-jet it. I put a pipe, K&N mounted straight to the carb (no airbox) Cool head, clutch spring. Any replies would be greatly appreciated. Another thing does any of you live up here close, will it be too cold to ride after Thanksgiving.

 

Disreguard, read Jacks post.

Jerry Goodman '99 400L, '98 TBlazer



[This message has been edited by A400L (edited 10-24-1999).]

 

A general rule of thumb is to change your mainjet one size for every 2500ft change in elevation and 25 degree change in weather. The higher you get the thinner the air so go to a smaller mainjet. The colder it gets the denser air gets so go larger on the mainjet. You really need to learn to read spark plugs and listen to the way your engine runs to get it right. Try these webpages for info.

www.centuryperformance.com/spark.htm

www.strappe.com/plugs.html

http://www.sandiego.com/scripts/whee...idc?passin=458

http://www.webspan.net/~rpfirley/

Hope that helps, Scott.

 

The information that was posted above here is absolutely incorrect. That's the trouble with all this net crap, anyone can post garbage as if it is gospel . . . do not believe it. Unless you know the source of your information, do not take info posted here and use it. Apparently some folks are reading information from a manual and don't know what it really means.

There are two things to consider, (1) altitude (2) temperature.
ALTITUDE: One jet size "smaller" leaner for every increase of 2,000 ft. in altitude. so for an increase of 7,500 ft. that would mean approximately a 3-4 main jet size change "decrease" (leaner) in jetting.
TEMPERATURE: One jet size "larger" richer for each 25 degree "decrease" in temp.

You may find that going from say 70 degrees to 40 degreees at 7,500 ft. that the jeting change should be about 2-3 sizes "smaller". One thing for certain. If you don't change jets you will not hurt your motor at all, but you will be running rich on your main jet.

<A HREF="http://www.godigital-design.com/96Polaris.html">Schultz Motorsports</A>

 

I stand corrected! Thanks for clearing that up Jack.

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Jerry Goodman '99 400L, '98 TBlazer

 

The altitude may go hand in hand with the temp change so maybe I won't have to change at all. It was 95 degrees in Texas and was running great a 0 elevation, here its 40-45 degrees and 7500 feet

 

I'm 100 miles S.E., of ya Greeley Colo.By thanksgiving you'll see me go past your place on the way to the snowies with my snowmobile!!!!!You could maybe ride at walden at the sand dunes.But with any luck anything west of you will be snowed in!!!!HY 130 that runs through Centenial will be closed down west of Centenial.You will be able to get to Walden on 230.Also head south on HY 287 to red feathers you can usually ride there till later in winter,lower elevation. LATER COB

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Hey corncob I bought a snowmobile yesterday. Its a polaris Indy 400. So it will be snowing that much by thanksgiving. I thought that I would probably get to ride the 4-wheeler until Christmas, but if there is going to be snow that early I may just start riding snowmobile and leave the fourwheeler in Texas. Is there alot of place

 

sorry I accidentaly clicked submit, is there alot of places to ride arond here. I know nothing about snowmobiles I have never really seen one until I bought one yesterday. Maybe you could swing by and go riding with me.

 

The snow is getting closer,we have always gone by 2nd week of NOV if not sooner.We'll pick you up at fosters on snowy range road. COB