January 17, 20179 yr My mate has an 07 rev3 250 that has never really run right. You would think that it must be too rich because you have to rev it out cleanly before any sort of climb or it will run almost as if it's still cold, yet it seems to 'pink' a lot on high revs, as if it's a bit weak??? It's got a mikuni carb. Any ideas???
January 18, 20179 yr Check ignition timing. Check carb jetting. Look for case leaks around the crank and specifically under the reed housing. Check the condition of the reed. Use good quality fuel. Look for splits in the air boot between the carb and intake manifold. Remember a cold engine is a lean engine so air leaks are a possibility. Does it get better with the choke just slightly open? Does it change with mixture screw position? Gotta do the homework.
January 18, 20179 yr As dan has said plus check the spade on the HT coil along with all other electrical connections.
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