I forgot to add that my experiences are more MC21 biased, but found the adjustable needles invaluable when tuning an Eric Gorr ported MC18. I just couldn't get it right with the stock bits.

My '21 runs dry Ramax filters (no airbox) "B" needles, #40 slows, PJ blanks and big mains (no, I'm not giving numbers!). I also run the HRC X and Y pieces, but that's because I haven't been able to try it on a dyno to see the difference in effect it would have not using them! I'm sure the difference is small, but the Poser points are big!! :D

What we need now is Matt Patterson to jump in and throw his cat amongst the chickens and contradict both Paul and myself with another entirely different opinion again! :lol:

Andy.
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