dmc2028372 Posted January 17, 2017 Report Share Posted January 17, 2017 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??? Quote Link to comment Share on other sites More sharing options...
dan williams Posted January 18, 2017 Report Share Posted January 18, 2017 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. Quote Link to comment Share on other sites More sharing options...
steve_earle Posted January 18, 2017 Report Share Posted January 18, 2017 As dan has said plus check the spade on the HT coil along with all other electrical connections. Quote Link to comment Share on other sites More sharing options...
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