lets back up a moment............ have you made sure that the float is shutting fuel off and the the float is adjusted correctly? and are the reeds laying down as they should? this must be done before you can make any attempt at jetting.
back to jetting... the 48 pilot is a good starting point with the pilot set at about 1.5 turns out. what needle you running(should be set in the middle)? the main is about right for starters.
once you've varified the float level and that its shutting fuel off and have a fresh plug gapped at .018 - .022. warm the engine up to operating temp and get out in some terrain and run the gears. it may load up on you as gas en oil will tend to puddle in the crank case and it's throat needs to be cleared"so to speak". after running through some gears a couple of times note whether or not it tries to clear out. if it does then try to perform a wot plug chop for the main. once you've got it jetted for main. do a chop at mid throttle paying attention to how it sounds. once you've got the needle adjusted focuss on the pilot jet and pilot adjustment. once you got all three fairly close you can do a fine tune from there.
250R's...... "they gots bite wiff dat bark !!!" R's are fo sand bars.....
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