Should I RB before they’re gone or lectron

Questions and Answers about the best carb and Head mods available for the KDX.
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spencerdiesel
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Should I RB before they’re gone or lectron

Post by spencerdiesel » 08:26 pm Jun 27 2019

Hey all, I’m excited to be joining this forum! I’ve been researching KDX literature for a few months after deciding it’s the bike for me. I know I’m years late to the KDX game but I want to learn the best I can before KDX support fades.

Does anyone have reccommendations as to a new RB modded carb vs a lectron? I’ve read a few threads on here about the lectrons and it’s seems they have finally dialed in the fitment issues.

I love the notion of being able to meter and fine tune a set A/F ratio with an external adjustment, especially if the lectron is as crisp/ responsive as the RB.

However, having no real world KDX experience (or lectron or RB experience), I would love input of y’alls opinions and experiences with both carbs.

The reason I’ve made this post before even acquiring the KDX is I’m afraid the RB option may be gone soon, and if I decide that’s the route I want to go I’d like to order one before that happens.

I do have good knowledge and aptitude with jetting, as I’ve perfectly (as close as can be anyway) jetted my crf100 and rm125 via plug chops and cutting the plugs. Though once again, the external adjustments (I can tune via plug chops & make corresponding reference marks) sound so appealing.

Please educate me, and thank y’all!
Newbie to riding, currently have a ‘95 KDX200 and an ‘03 RM125

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Re: Should I RB before they’re gone or lectron

Post by KDXGarage » 03:36 am Jun 28 2019

Welcome to kdxrider.net. Good luck on the KDX hunt. Good start to already know about plug chops.

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Re: Should I RB before they’re gone or lectron

Post by spencerdiesel » 05:57 pm Jun 28 2019

Thank you!

I’m also semi settled on a PC platinum 2 if that has any influence.
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Re: Should I RB before they’re gone or lectron

Post by SS109 » 07:52 pm Jun 28 2019

Personally, I like an RB carb better than a Lectron but I have no direct experience with both on a KDX.

My RB carbed 220 has instant throttle response and, even though some will say they are more jetting sensitive, all I've ever done is raise or lower needle a clip depending on weather and elevation. Yeah, it's dialed in perfectly that way but it's damn close. I've never had spooge running out my silencer or fouled a plug. I ride in temps from about freezing up to 105 degrees and elevation of 1200 to 6500ft.

My Lectron experience is on my GasGas EC250. It has performed well and has been a set it and forget it kind of deal. However, I don't feel the throttle response is as crisp and responsive as an RB carb. That said, it could be I don't have it dialed in good enough yet and/or the Rekluse auto clutch is just making it feel that way. I think the Lectron would probably be best if you ride some serious elevation changes or just hate messing with jetting.

So, take what I say with a grain of salt. I would probably put the experience of those with Lectrons on KDX's over my experience.
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Re: Should I RB before they’re gone or lectron

Post by KDXGarage » 06:19 am Jun 29 2019

Unfortunately, what you need is that magic someone who bought a new RB carb AND a Lectron AND swapped them back and forth AFTER perfecting jetting on both.

Otherwise...

"well... his RB carb was just modded, not bought new"
"well... did he have it jetted perfectly"
"I HAVE ONE AND I LOVE IT"
etc.
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Re: Should I RB before they’re gone or lectron

Post by spencerdiesel » 08:04 pm Jun 29 2019

These are all great points. The main reason Im ever so slightly leaning towards the Lectron is I like to jet as close to peak power as possible for my "home riding" elevation of 3000 feet. If we ride in GA or SC I will be 1-2k lower elevation and be at the most dangerous point; the lean side of peak power.

This is no big deal as I know how to jet and can do so as long as I make time for it. Often our trips as above are semi spontaneous and short, kind of a "hey lets go to SC in the morning".

I can play safe by staying jetted for the lower elevation and being a little rich back at home, but I do like being jetted ideally as opposed to a rich compromise.

I guess having the luxery of an on-the-fly adjustable A/F ratio has got me a little excited. Also, doesnt the lectron allow one to have nearly linear (no steps/ transitions in circuits) response and eliminate intermittent 4 stroking/ rich blubbering?
Newbie to riding, currently have a ‘95 KDX200 and an ‘03 RM125

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Re: Should I RB before they’re gone or lectron

Post by javjacob » 10:35 am Jul 04 2019

Get the RB carb.
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1996 Kawasaki KDX200

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Re: Should I RB before they’re gone or lectron

Post by spencerdiesel » 10:05 am Sep 19 2019

Picked up a very clean and seemingly low hour ‘95 KDX200! The reason I believe low hour is it has a kenda Millville rear tire, didn’t they stop making the original Millville like 2010?

Anyway I got a great deal because the PO couldn’t figure out why it ran ridiculously rich past 1/2 throttle, even with the needle clip in the top, said it had the stock 48/ 160 jets. He had his Kawi shop put new crank seals in it, but that wasn’t it.

Well lo and behold I rode the bike and it wouldn’t pull over 6k rpm WOT, smoked and 4 stroked like no other. Pulled the MJ out and it was a 180!!! Put a 40/ 155 in there and the major part of the issue was solved, albeit still rich on pilot and main (stock pipe).

Set float height to 17mm, removed the jet block and replaced the jet block o ring.

I took about 2 hours to decipher the keihin needle chart on the JetsRus website and ordered CEQ & DEQ needles based on my observations of the stock needle. I have the CEQ in right now and there is zero 4 stroking from 1/8 throttle on up, and no leak spots via plug chopping. I’ve also learned real quick how rich the stock #5 slide seems to be, as I’m down to a 35 pj and it still 4 strokes at 1/16 throttle.

Ordered a PC platinum 2 pipe, and emailing Ron for a new RB carb. Do all RB carbs come with the thumb adjustable air screw? Thanks y’all!
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Re: Should I RB before they’re gone or lectron

Post by KDXGarage » 04:15 pm Sep 19 2019

Congratulations on getting it going!
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Re: Should I RB before they’re gone or lectron

Post by Vossman » 10:54 am Sep 22 2019

Mine came with additional jets but no adjustable screw. He does not make them anymore. JD makes a good brass one though. He will jet it for your location though so it should be close.

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