jetting and altitude

03-13-2008, 05:27 PM

I live at about 600-700 feet and the hills and back roads around here extend up to around 1400 feet, I've already installed the air filter and moved the clip down to bottom. I currently have a 115 jet which I was planning on putting in. What do you guys think about it?

btw I noticed that my stock air box already had a couple of 3/4 inch holes drilled in the top. I saved the filter and everything so I can install it before I go riding in dust. If all goes well I plan to attend the rumble on the ridge on april 5th with a friend of mine.

http://rumbleontheridge.homestead.com/

red2003 · 03-14-2008, 07:59 AM

Stock jetting will be fine at that elevation.

katoranger · 03-14-2008, 02:32 PM

I have been from 900-4000ft on one trip with no problems.

Allen

03-15-2008, 12:56 PM

But will it be of any benefit to install the 115? I guess I will just have to do the throttle chop thing and then pull over and check the plug.

red2003 · 03-15-2008, 06:01 PM

No, don't change to a bigger jet. Higher elevations need LESS fuel, not more.

03-17-2008, 02:01 PM

But red, would I not get a boost in acceleration when merging onto the highway? I have short highway sections I have to use to get around occasionally and merging scares the crap out of me most of the time (yeh i know im still a newb).

liverchip · 03-17-2008, 04:57 PM

I'm at 3500ft....what do you consider high-altitude?

lonfu · 03-17-2008, 11:57 PM

Higher elavatin means less air, then this means less fuel is required to maintain the 14 to 1. Smaller jets mean less fuel. Generally 2000 feet is the first jet change elevation. I'm at 3500 too. have ordered a lf200gy too! We'll see how it runs when it arrives.

03-13-2008, 05:27 PM	#1
Guest Posts: n/a	jetting and altitude I live at about 600-700 feet and the hills and back roads around here extend up to around 1400 feet, I've already installed the air filter and moved the clip down to bottom. I currently have a 115 jet which I was planning on putting in. What do you guys think about it? btw I noticed that my stock air box already had a couple of 3/4 inch holes drilled in the top. I saved the filter and everything so I can install it before I go riding in dust. If all goes well I plan to attend the rumble on the ridge on april 5th with a friend of mine. http://rumbleontheridge.homestead.com/
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03-14-2008, 07:59 AM	#2
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,218	Stock jetting will be fine at that elevation. __________________ 2006 Roketa RSX200E MODS: YZ250F Muffler, Airbox delete with K/N style filter, Main Jet reamed 2 sizes over, Yamaha R1 Rear clicker shock on custom scissor linkage making 8 3/4in. of rear wheel travel!!! Battery relocated under seat.
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03-14-2008, 02:32 PM	#3
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I have been from 900-4000ft on one trip with no problems. Allen __________________ You meet the nicest people on a Honda Clone.
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03-15-2008, 06:01 PM	#5
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,218	No, don't change to a bigger jet. Higher elevations need LESS fuel, not more. __________________ 2006 Roketa RSX200E MODS: YZ250F Muffler, Airbox delete with K/N style filter, Main Jet reamed 2 sizes over, Yamaha R1 Rear clicker shock on custom scissor linkage making 8 3/4in. of rear wheel travel!!! Battery relocated under seat.
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03-17-2008, 04:57 PM	#7
liverchip Join Date: Nov 2006 Location: Mystery Spot Posts: 1,223	I'm at 3500ft....what do you consider high-altitude? __________________ 2009 XR650L Big Red Pig Tusk bar risers 2007 X-Moto(Jetmoto) GY250 --mods--- 15/40 sprockets UNI Pod Filter 2007 Shineray TMS 200XYi--Betsy Betsy Mods:______________________ Acerbis DHH headlight FMF Powercore pipe Uni Pod Filter
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03-15-2008, 12:56 PM	#4
Guest Posts: n/a	But will it be of any benefit to install the 115? I guess I will just have to do the throttle chop thing and then pull over and check the plug.
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03-17-2008, 02:01 PM	#6
Guest Posts: n/a	But red, would I not get a boost in acceleration when merging onto the highway? I have short highway sections I have to use to get around occasionally and merging scares the crap out of me most of the time (yeh i know im still a newb).
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03-17-2008, 11:57 PM	#8
lonfu Join Date: Feb 2008 Location: kingman az Posts: 34	jets Higher elavatin means less air, then this means less fuel is required to maintain the 14 to 1. Smaller jets mean less fuel. Generally 2000 feet is the first jet change elevation. I'm at 3500 too. have ordered a lf200gy too! We'll see how it runs when it arrives.
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