Question about 2003 Yamaha WR 250 F
With regards to changing altitudes from sea level to 1800ft. the only change you would have to make if any would be the idle adjustments with regards to the mixture at idle . I would recommend removing the carburetor for a complete rebuild , including the acid bath, to completely dissolve and eliminate any varnish residue or other petroleum byproducts that have accumulated within the small orfices in the idle circuit and power circuit. Also , I would drain and flush the fuel tank , fuel lines, and any other fuel circuit components before the carb inlet. Finally , install a new fuel filter and air filter. When you reassemble the carb, carefully screw in and seat both set screws. Then, set the power screw 1.5 turns from the seated stop. Set the idle screw 3/4 of a turn from the seated stop. Finally , adjust the throttle plate set screw 2.5 turns clockwise after the screw contacts the metal with the throttle plate fully closed. From there, the bike should start. Get it to idle first. Then , you can play with your power screw one corner of a turn, in and out, at a time, while you drive it accelerating hard, feeling what it does, make an adjustment, repeating the process until you have achieved a nice powerful smooth acceleration without loading or hesitating.
Posted on May 11, 2010
At high altitudes the carburetor needs specialist adjustment.
I highly recommend JDjetting kits for all altitudes
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Posted on May 09, 2010
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Posted on Jan 02, 2017
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