hi guys, my fren just got an RB V12 3 port paired with the RB 2611 pipe. during break in ( followed the manual) all went well. after the 9 tank we started to lean it to get it to race tune. but there seems to be something wrong. the idle is not stable and the engine will over heat. after richin it back it will bogg. when leaning it back (in 1/8 turn the main needle) it still act the same. we r totally out of ideas. we try to look for leakage but there were none except some fuel near the carb.but we think that should be normal