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 Post subject: Colorado Jetting 2013 250 XC
PostPosted: Thu Aug 18, 2016 12:59 pm 
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Location: Atlanta
I'm trying to decide whether to spend the money on a JD or Slavins Jet Kit for my upcoming trip or just change the stock jets and or clip position. We will be riding in the 8,000' to 12,000' range. Does anyone have experience with this specific bike? I know we all have opinions ::screwy:: but I'm really looking for real life experience with this exact set up.

Let the games begin ::popcorn::

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 Post subject: Re: Colorado Jetting 2013 250 XC
PostPosted: Thu Aug 18, 2016 2:32 pm 
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Posts: 13370
Location: Flowery Branch, GA
Jet pilot & main 91% of stock sizes, drop needle 1 notch. Ride it like a 200. Actually . . . . that might be too lean. ::eek::

There's a jetting chart in your manual for 7,500 - 10,000 ft. For the next elevation level I'd use the box to the right (leaner). Remember it'll be chilly up there (50F?) so compensate for that, too. Oh, and don't forget your new swag jacket. I want a selfie!

Best,
- c bob

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Pro Line - GREAT support!
Fragile Kids Foundation Family Fun Ride - Apr 30, 2017
Thanks to: Mika Metals, Twin Air, Scott, ZeaVision . . . . ><>


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 Post subject: Re: Colorado Jetting 2013 250 XC
PostPosted: Thu Aug 18, 2016 2:53 pm 
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Thanks Cbob

I have the book specs but wanted to see if there were any real world experience with the GOR folks who have been there done that.


I'm sure there will be plenty of selfies!

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 Post subject: Re: Colorado Jetting 2013 250 XC
PostPosted: Thu Aug 18, 2016 5:59 pm 
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Location: Cedartown
C-class4ever wrote:
I'm trying to decide whether to spend the money on a JD or Slavins Jet Kit for my upcoming trip or just change the stock jets and or clip position. We will be riding in the 8,000' to 12,000' range. Does anyone have experience with this specific bike? I know we all have opinions ::screwy:: but I'm really looking for real life experience with this exact set up.

Let the games begin ::popcorn::

If you buy a JD jet kit, you went backwards. I have no experience with Jeff Slaven's jet kits, so maybe they work better. Either way, you will still have to jet the motorcycle, jet kit or not. I have considerable experience jetting many different bikes for Colorado trips, including KTM 2 strokes. One thing I have learned... you will end up leaner than the specs you find in manuals, or get from people that *should* know, especially jetting in the low RPM ranges. Everyone seems to jet too rich for high altitude.

You will make big changes to your air screw, and having a small screwdriver handy while you are riding will make transitioning a couple thousand feet in altitude much better with a quick air screw adjustment.

I would start with a #35 pilot, drop the needle 2 positions, and drop the main 2 full sizes. Bring more jets with you to adjust one size either side of that jetting, and plan to spend an hour or so the first day playing with jetting. Then just ride and adjust the air screw now and then for the altitude.

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http://www.HighlandParkResort.com

A fine is a tax for doing wrong. A tax is a fine for doing well.

If you find yourself going through He11, keep going!


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 Post subject: Re: Colorado Jetting 2013 250 XC
PostPosted: Thu Aug 18, 2016 9:13 pm 
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Location: Flowery Branch, GA
Don't forget to check air pressures AT ALTITUDE. I made that mistake and after setting it at 12 or 14 psi in ATL was running around with ~20psi at 10,000 ft. It was a little sketchy on those gravel roads.

Ultra heavy duty tubes, not just HD, are HIGHLY RECOMMENDED. Encourage others to do the same. You don't want to waste your time or watch some other guy changing a tube on the side of a trail without a stand.

Breathing at 13,000 ft is fun, too.

Best,
- c bob

_________________
KTMWorld & Highland Park - Great staff, Great place to ride
Pro Line - GREAT support!
Fragile Kids Foundation Family Fun Ride - Apr 30, 2017
Thanks to: Mika Metals, Twin Air, Scott, ZeaVision . . . . ><>


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 Post subject: Re: Colorado Jetting 2013 250 XC
PostPosted: Fri Aug 19, 2016 6:54 am 
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Thanks Paul I was hoping you would drop some knowledge us.

Cbob The crew I'm going with has been doing this trip for many moons so I'm taking most of their advice. They said to cut the knobs off my tires and not to bother with tubes just duct tape the bead to the rim and if I'm really paranoid to use big zip ties. I think they are being straight up with me...

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