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#142089 - 07/06/18 12:16 AM Re-jetting for Colorado Altitude!
Paul & his XT250 Offline
Junior Member

Registered: 02/17/18
Posts: 4
Loc: Denver, Colorado
Hey guys! Iíve got a bone stock 2011 XT250. Just moved to Denver from Pittsburgh, so Iíve gone from about 800ft in elevation to 5500-10000 depending on my ride. Who can give me advice on jet sizes? She does well enough around town, but cuts out pretty bad when trying to maintain speed. I can get around it by opening the choke halfway, but I want a permanent fix. Help!

Thanks guys smile
_________________________
- Paul

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#142093 - 07/06/18 02:16 PM Re: Re-jetting for Colorado Altitude! [Re: Paul & his XT250]
peejman Offline
Platinum Member
*****

Registered: 06/03/13
Posts: 2914
Loc: East TN USA
If you have any intention of going back down to lower altitudes, a better choice is to allow the bike to get more air, instead of reducing the amount of fuel. I'm more familiar with the 225, but I'd assume the same principle apply to the 250.

There's a few airbox mod options that can accomplish this... a high flow air filter might be enough.

You can add aftermarket exhaust (make sure it's DOT approved with a spark arrestor).

You can cut down or remove the snorkel (does it have a snorkel?)

You can drill holes in the airbox and cover them with plugs or tape when you go to lower altitudes.

As for jetting... just reduce the jets 1 size at a time until you're happy. I wouldn't expect it to take more than 1 or 2 sizes down.


Edited by peejman (07/06/18 02:16 PM)
_________________________
This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.

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#142095 - 07/06/18 04:12 PM Re: Re-jetting for Colorado Altitude! [Re: Paul & his XT250]
Paul & his XT250 Offline
Junior Member

Registered: 02/17/18
Posts: 4
Loc: Denver, Colorado
I've been considering adding an FMF or DG aftermarket pipe, they weigh significantly less than that stock one and sound pretty nice. I wonder if that alone would be enough, might be worth a try.
Tell me more about drilling holes, I've never done that to an airbox... start with one small one, and then go from there if it seems to need more?
_________________________
- Paul

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#142098 - 07/06/18 08:24 PM Re: Re-jetting for Colorado Altitude! [Re: Paul & his XT250]
peejman Offline
Platinum Member
*****

Registered: 06/03/13
Posts: 2914
Loc: East TN USA
I've seen adjustable airbox covers out there, though my google-fu is failing me at the moment. They're made with a slider over a hole so you can open/close however much is necessary.

There was also a long-time member here who seems to have disappeared that used 1" electrical box plugs. Drill holes 1" holes in the air filter cover and use the plugs to block them off at lower altitudes. I believe 1 or 2 holes was all that was necessary, but that was for a 225. Once upon a time there were pictures, but they may have been lost to the photobucket debacle.
_________________________
This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.

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#142113 - 07/08/18 11:22 PM Re: Re-jetting for Colorado Altitude! [Re: Paul & his XT250]
Confusiontactic Offline
Junior Member

Registered: 09/05/17
Posts: 30
Loc: S.W. Alberta
_________________________
1998 XT225 "Rocky Mountain Scrambler"

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