Maintenance & Technical > KX500 Original

Any body running a 40 Lectron?

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tobys 2 strokes:
I have just installed a 40 Lectron on my dirt bike and was wandering what everyone else is running for needles.
its bone stock except for a FMF woods pipe. My dune bike has some other mods and I run a 44 with a 7-2 needle the only  extra needle I had was a 5-2 and it seems to be on the lean side I am up to a 85 power jet and turned way in on the needle.I am around 750' elevation.

Motorrad:
Everyone is running a 4-2xlat about 1.025"

I'm running a 5-2xl. And I think it's going to be rich.   Havnt gotten it out of town yet to get opened up past crack off idle

Motorrad:

--- Quote from: Motorrad on October 31, 2012, 03:33:54 AM ---Everyone is running a 4-2xlat about 1.025"

I'm running a 5-2xl. And I think it's going to be rich.   Havnt gotten it out of town yet to get opened up past crack off idle

--- End quote ---

This is on 44mm.   But they should require more jet..


Oh.  And most are at. 1.5 turns on powerjet.  You are running a powerjet right?

tobys 2 strokes:
(This is on 44mm.   But they should require more jet..)
  So the bigger bore should need more jet?  I wasnt sure seeing as to how the velocity changes with the bore sizes.
yes I have a power jet this ones not adjustable like my 44s it uses mikunie pilet jets and I am all the way up to a 85.
I started at the recomended 2.039  and have had to run it in 2 1/2 full turns and am still lean on the low end.

Motorrad:
Generally yes.  It's a velocity thing.  Smaller carb. More velocity to suck on jets harder..  (opposite of fat chicks)

Going from 5-2 to 7-2 and changing your power jet won't help your bottom end

7-2 and 5-2 are same bottom end.  Just richer mid to top

Need to change second number

Ie.  5-1 is leaner bottom than 5-2

5-3 is richer bottom than 5-2

All 3 are identical top end and high mid

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