The Jha jet kit is (was) all HRC parts, still in the HRC packets, plus a sticker! They also added power jet blanks with their MC21 kits; something that HRC never did until the MC28 kits came out.

Your poor carburetion around 4000rpm could quite likely be due to the wrong X and Y pieces, but it could also be needle type and/or position. My MC21 carburetes almost perfectly from idle to 12000+rpm*, StephenRC45's MC18 carburetes absolutely perfectly across the whole rev-range, but he has dedicated countless hours to getting it right both on the road and on his dyno. Being a dyno operator it would be pretty hypocritical for it not to be perfect in his opinion, and it's an example of why I wouldn't take an NSR anywhere else in the UK to be set up.

*I don't have the patience of Stephen to refine mine any further. It's rare that I need the ultimate flexibility of sudden WOT below 3000rpm like he has achieved, even with the F3 transmission and a 63mph 1st gear!
_________________
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.

Check us out on Facebook! Please "like" our page!