Customer jetting for a KX500

Jetting and intake information
Post Reply
User avatar
Sandblaster
Posts: 5715
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Customer jetting for a KX500

Post by Sandblaster » Mon Jun 26, 2017 3:17 pm

All Stock engine, stock pipe, stock pipe
Sea level
110 fuel
160 main and a 50 pilot, stock needle

Same bike Running the quad vent airstriker, 162 main and a 45 pilot. 110 octane fuel. I think I could drop to a 42 pilot.
I can get it to idle with the air screw out 2.5 turns.
If bikes are for kids I'll never grow up.

moto939
Posts: 22
Joined: Sat Apr 15, 2017 4:07 am

Re: Customer jetting for a KX500

Post by moto939 » Wed Jul 05, 2017 6:29 pm

Glad you made this post so I could confirm what I'm finding....

2001 stock motor
Rad Valve and reed spacer
RM250 short body air striker with Boyesen power wing
1200-1500 ft
110 vp/93 premium-no ethanol
50:1 K2 Maxima

stock needle #2 clip #7 slide
160 main
started with a 52 pilot but could tell in the driveway way too rich, so went to a 45. But like you, needed to be 2.5 ish out on the air screw to get a decent idle. Ran ok, but could tell it was loading up and studdering at low speed. Was running low on time, but dropped in a #8 slide and took it for a quick spin. Big difference.....definitely ran cleaner and smoothed out that transition from low to mid. It ran like a different bike. :D I'm still going to drop to a 42 to get the air screw back into 1.5 or so. If you have any spare #7 slides laying around, it might be worth cutting one to a 8 just for a tuning option.

This carb has such a strong vacuum signal (not sure if that's the correct term or not) that I'm starting to wonder if the stock needle is the way to go. I may measure some of the needles I have and see if any are worth a try.

User avatar
Sandblaster
Posts: 5715
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: Customer jetting for a KX500

Post by Sandblaster » Wed Jul 05, 2017 8:20 pm

As soon as I get to mine I will record my findings.
Everything I have seen says that the short bodied air strikers when correctly tuned and jetted will give way better throttle response....
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5715
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: Customer jetting for a KX500

Post by Sandblaster » Tue May 08, 2018 8:18 pm

Leo Sadzewicz
So...
I’ve been doing a whole lot of jetting experiments, bought every needle, every jet, and every slide.
And I have successfully gotten rid of all lean surging.
I’m at 3825’
#55 pilot
N82M 4th(stock)
182 main
#9 slide (which actually cures the problem for higher elevations)
Perfect usable power from idle to the moon.
I know there’s gonna be naysayers, let the crap begin :lol:
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5715
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: Customer jetting for a KX500

Post by Sandblaster » Sun May 27, 2018 9:38 pm

Coby Hosford
5000’ running a N82L 3rd clip 62 pilot 168 main gets rid of that deceleration surge and replaces it with a tractor like acceleration smooth all the way to the top.
If bikes are for kids I'll never grow up.

Post Reply

Return to “Carburetion, Induction, Fuel injection, Intake”

Who is online

Users browsing this forum: No registered users and 1 guest