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Bubba281

High Altitude Jetting XR650L

8 posts in this topic

I know jetting has been discussed at great lengths on this forum, but i have a specific question.

I am headed up to Mammoth, CA (about 9,000ft) in 2 weeks. WILL MY BIKE RUN AS IS OR DO I NEED TO CHANGE JETTING BEFORE I HEAD UP.

I have a 2005 XR650L, Dave's Mods, FMF Pipe, K&N Air filter, and Smog Off. I live outside of Los Angeles at about (1,500 ft) and the bike runs great there. I forget what the current jetting is, maybe 58/160 or 58/162.5. It has been 18 months or so since i last tinkered with this bike.

Thanks for any advice, especially if you have first hand expierience.

Brian

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you will be fine. im at 6500 in colorado springs and climb up to over 11k. i just have daves mod, smog off, and a twin air filter. i did daves mod to spec 55/158. i thought i would have to make it leaner for altitude but my plug is nice and perfect. i was suprised. you might bring one size smaller if you want to feel better but you should be fine.

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You might want to "un-do" Dave's mods. The most important is to go with a little smaller main jet. Perhaps a 158 or even a 155. Next would be to take out the needle shim. Usually is isn't necessary to change the pilot.

Most of the riding there is more like 7000 to 8000 feet. You should be able to run with no changes at all. It will just be a little rich.

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I know jetting has been discussed at great lengths on this forum, but i have a specific question.

I am headed up to Mammoth, CA (about 9,000ft) in 2 weeks. WILL MY BIKE RUN AS IS OR DO I NEED TO CHANGE JETTING BEFORE I HEAD UP.

I have a 2005 XR650L, Dave's Mods, FMF Pipe, K&N Air filter, and Smog Off. I live outside of Los Angeles at about (1,500 ft) and the bike runs great there. I forget what the current jetting is, maybe 58/160 or 58/162.5. It has been 18 months or so since i last tinkered with this bike.

Thanks for any advice, especially if you have first hand expierience.

Brian

i did a ride up to saddle bag lake near tioga last fall with a djet kit 52/160. it did get a bit rich at the lake 10,500 ft., but was ok.

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just got back from a ride up to 8000 ft, bike ran really well, but would not start the first day until I changed the plug, go figure

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just got back from a ride up to 8000 ft, bike ran really well, but would not start the first day until I changed the plug, go figure

what was your jetting?

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I have a 2007 XR650L that has a DynoJet Kit installed. It runs a 50 pilot jet (original pilot jet) and a 165 main jet (from DynoJet). It has smog block off kit installed, the airbox snorkel removed, a UNI air filter and a ProCircuit Type 496 slip on muffler. I live at sea level (San Diego) and the bike runs great. I took the bike up to the Yosemite area and ran the bike at altitudes between 4,500' and 8,000' and it still ran great with no changes at all to the jetting. I contacted DynoJet before I went and their technician said I should switch to the 160 main (also comes with the DynoJet kit) if I was going to ride a fair bit above 6,000'. Again, I didn't make any changes and the bike still ran just fine. It hauled my rear end and the wife's rear end up and down trails with no problems at all. Love my XR650L!

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glad you enjoy your pig! the tech is right about the 160. mine wouldnt run well here at 4300 ft with the 165. now i run an fcr41 158/52.

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