two-piece main jet?

[bbender85]

so since the build this summer my plug color has looked real good, but i figured i'd put a main jet in according to all the reccomendations i got here anyways. so i picked up a jet, took the carb apart, and come to find out the jet i bought was exactly the size that was in there. BUT..

the jet i bought was one piece; the one that was in there was a two-piece, threaded together. is (was) this like a dynojet kit or something? never seen one, so i have no idea.

[NacsMXer]

If the end of the two-piece jet was round with a slot for a screwdriver, it was probably a dynojet. They have small round main jets that screw into an adapter piece. Also look to see if there is a "DJ" with a number after it, then its a dynojet for sure.

Just remove the two-piece jet and install the new hex type one.

[bbender85]

yeah, i got it in just fine, it just made me wonder after the fact. it had a flat screwdriver slot too, so must be my assumption was right. i'll have to look closer for a DJ stamping... i know i saw a 170 tho.

[katch26]

if its a dj thats a huge difference....like 8 jets

there is a conversion chart on www.jetsrus.com tog o from keihin to mikun i and/or dynojunk

[leasureryan]

I say ditch those dumd Dyno jets....Why would anyone change the jet calibration? Kinda dumb in my opinion, just trying to make it hard on everyone. I use Kehin jets only. I know how precise thier jets are, and they use a standerd measurment.