My H2 has Ivan's jet kit. I put on a different set of cylinders, mildly ported and squish heads (not Moo's, somebody else.) The bike runs well. I guess due to the squish heads, jetting changed and I put the needles at the leanest setting (#1 - the top) to get the bike running right. There's still a rich spot from 1/4 - 3/8 throttle.
Having looked at the info here:
http://kawtriple.com/mraxl/carb/mikunineedle.htmlI thought I might try a narrower needle jet to allow for better adjustment of the needle. I believe 169 O-5 needle jet is .005 mm narrower than the stock needle jet and I don't know how much difference that will make. So I'm thinking of ordering the 169-04, which I think is .01 mm narrower than stock.
Another thought was to put the stock Mikuni needle jets back in place of Ivan's needle jets. But Ivan's website says his needle jet is an exact reproduction of the original, so that might not get my anwhere.
Has anyone here experimented with different size needle jets on stock H2 carbs?