By "different length mainjet, needle holder" I presume you mean the emulsion tube?

these are emulsion tubes with mainjets in place (and a pair of needles).

A standard mc21 emulsion tube is 31mm long, an HRC one is around 33mm long (I've not got one to hand).

The different length is for the HRC needle which is also longer, if you ran an HRC needle in it's top clip (i.e. as lean as it can be) on a stock emulsion tube it would jam in the MJ totally at closed throttle.

If you really do mean the main jet then it's just a nasty pattern jet or just not for those carbs at all. I've seen a few with different shape tops and different shape drillings but never any different lengths.

Presuming this is about the same bike as the jet kit thread, lets try to keep the discussion in one place shall we? Or I may try the "merge thread" icon which will almost certainly crash the entire internet.

Actually, disregard that comment there is no merge thread option, only a split thread!
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Last edited by fontyyy on Sun Dec 13, 2009 3:17 pm; edited 1 time in total