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Old July 31st, 2022, 10:24 PM   #24
Mauricemonge
ninjette.org member
 
Name: Maurice
Location: San Francisco
Join Date: Sep 2018

Motorcycle(s): bastardized ninja 250 (think land speed record with a sidecar) soon to swap a 500 engine

Posts: 34
Quote:
Originally Posted by DannoXYZ View Post
Awesome progress!!! Add 1/2" crossover tube connecting 2 intake runners about 1/2-way.
That would totally be the way to go! I almost bought a k&n 2-1 filter rc3510 to put at the end. I ran a similar one on the 250 and it was really helpful with tuning since it gives kind of a little plenum to even out some pulses.

I sadly haven’t welded aluminum before. But I bet I could jb weld a crossover tube.

My AFR’s aren’t perfect, but it’ll work. Here’s what they are.
Idle 14.0+/-
Coasting (low, med, and higher rpm) 12.5ish AFR
Accelerating low 11.8-12.2
Accelerating medium 12.5-13.2
Accelerating high rpm WOT 13.2 (richer at lower rpm WOT)

The only lean I have is between 4-5000 rpm and 1/3-1/2 throttle. It’s not for long, and it only leans out to about 14.5 afr.

I actually can’t believe the ex250 needle worked so well. It’s so different from the 454 needle that was in there. I had bought an ex500 carb kit, and the needle that it came with was shorter and had some taper to it, but still very different than the 250
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