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Carborator settings for 1990 xr250r

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These settings are just a place to start from. You'll have to adjust your jetting and fine tuning from there.

 

The stock settings are:

 

Pilot- 40

Main- 125

Needle- clip 3rd from top

Float Level- 12.5mm

Fuel Screw- 2 1/4 turns out

 

Valve Clearances:

 

Intake- .05mm (.002")

Exhaust- .08mm (.003")

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If you are interested , I can scan and email you a manual . Ill pm you my email then i can bring it to work and send it to ya, helped me a bunch when I got my 90 xr250. 

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125 is too lean for the main if you have any breathing/exhaust mods.  40 is OK.  I have the fuel screw 3 turns with the 40 or 2 turns with a 42 and 135 main.

 

I use .004" & .005" on my valves to be sure I don't burn one. 

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If you are interested , I can scan and email you a manual . Ill pm you my email then i can bring it to work and send it to ya, helped me a bunch when I got my 90 xr250.

That would be amazing. I've been trying to find a legit manual for my bike. It would help a ton!

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