All the comparison charts are wrong, DJ jets cannot be compared by using I.D. , no one measures them correctly due to DJ's venturi design, and I'm wasting my breath telling y'all this.

This is from a DJ jetting specialist of 20 years.

I asked because I wanted to know. But this is all the breath I'm gonna waste on the subject.

 

So how do they compare then?

Same? More? Less?

 

Just buy larger Keihin main jets then from PJ Motorsports or JetsRUs and be done with it.

 

That's what I should have done. Just bought that N1TC needle, a 125 and 128 main, and duplicated what i did on my 07 bike, because it flew. Would have saved a bunch of $$ over the DJ kit, too.

 

Me too Zomby.

 

Don't leave us in the dark. I'm sure your specialist told you how they're actually sized in comparison

 

I think he quipped that measuring the largest I.D. of a DJ main jet's venturi is closer to a comparable Keihin I.D.

He also said the same number DJ would be similar, in use, to a Keihin but not an exact match. We talked about a lot of stuff.. He thought my MCM, lid off bike would need a DJ136.. One of which is already on its' way to me.. I forgot to ask about the DJ needle vs the N1TC - but, to me, it is obvious that N1TC needle with Keihin jets go way richer than DJ needle + a comparable DJ main.


Any of yall can call him.. Ring up DynoJet and tell em you need to talk a jetting specialist...