As I work my way through the 2d- and 3d-Gen carburetor sets awaiting a new lease on life, I find myself in need of stock size jet needles — if you have some to spare I'm happy to purchase or trade for some aftermarket jet kit needle sets. Some of these carb sets came to me with jet kits installed and I'm returning them to stock jetting.
The needles are NLA from Honda, of course, and there's a variety of subtle size differences among the generations/models/engine size. This is noted in an alphanumeric stamping under the "brim" at the needle's top, i.e. J99Q. I decided to compare the RC24/26 and '90-93 RC36 ('94-on are different) as they're the same length and visually nearly identical. I don't plan on interchanging them, I was just curious as to the taper differences. In this photo, I show those differences in millimeters and throw in a jet kit needle for comparison (I think it's from an RC24 Dynojet kit).
Of course, this isn't an apples-to-apples comparison, as I don't know of any difference in the emulsion tube diameters, if any. But the sizable difference in main jet sizes would suggest there is; #118 (RC24) vs #130 (RC36). I can't imagine the extensive dyno tuning required by Honda engineers back in the day to get these needles to work just right. Switching to fuel injection in 1998 must have been a real game changer for those guys.
The needles are NLA from Honda, of course, and there's a variety of subtle size differences among the generations/models/engine size. This is noted in an alphanumeric stamping under the "brim" at the needle's top, i.e. J99Q. I decided to compare the RC24/26 and '90-93 RC36 ('94-on are different) as they're the same length and visually nearly identical. I don't plan on interchanging them, I was just curious as to the taper differences. In this photo, I show those differences in millimeters and throw in a jet kit needle for comparison (I think it's from an RC24 Dynojet kit).
Of course, this isn't an apples-to-apples comparison, as I don't know of any difference in the emulsion tube diameters, if any. But the sizable difference in main jet sizes would suggest there is; #118 (RC24) vs #130 (RC36). I can't imagine the extensive dyno tuning required by Honda engineers back in the day to get these needles to work just right. Switching to fuel injection in 1998 must have been a real game changer for those guys.
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