Yes, no problem at all using any needle (including stock ones, and bear in mind there are a number of profiles to play with if you collect MC16, MC18 I & II, and MC21 needles!) in HRC carbs.
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Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
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