Quote:
Originally Posted by ridetheworld
Molly,
I`m with a 250 as you might know. Over 3,500m I had pretty alarming spluttering issues, kinda felt like engine would die momentarily and then kick back into action, as though someone grabbed the clutch in for a second. Should I take the air filter out or anything else one can do to get more power at altitude? Sorry bit off topic I know! 
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This is typical at high altitude. I don't know your bike ... but if it has a
Pilot fuel screw (usually on bottom of carb) the fuel screw needs to be turned IN (clockwise) to LEAN out the low speed mixture.
If you can ... OPEN UP the Air box. I would leave the air filter ON. But try to remove any thing impeding air entrance into the Carb. On my DR650 I cut a big hole in top of air box to increase air flow.
Some air boxes will have a removable side panel. If you have this ... remove it.
If you can LEAN out the fuel screw (it may be hidden and sealed on your bike) then you will also need to raise up the idle speed. I'm sure you have this adjustment on your bike.
But a 250 is going to suffer at 3500 meters no matter what. But leaning out
pilot fuel adjustment, opening the air box and increasing idle speed will :
1. allow smoother running
2. better fuel economy
3. better starting/idling
MORE AIR is what you need!
Good luck!
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