i recently rebuilt a 91 250x and had the same problem come to find out it was a mixture of 3 things the first thing i noticed was the valves needed adjusted so i adjusted them intake: 5mm exhaust: 4mm
it helped a little so then i figured well ill clean the carb and that helped more but it was still lacking the power it needed so the next thing i did was readjust the timing and come to find out i was off a tooth and now it runs unbelieveably stronger that it did stock..
my mods include:
STD bore 12:1 high compression piston
stage 1 hotcam for 300ex
barnette dirt digger kevlar clutch
not much but made a big power increase
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