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Old 04-28-2010, 05:39 AM   #1
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Questions?? Low speed needle tuning?

Hey guys, i have a .28 Jammin JPX engine 3/4 gallon through it with a RB 2045 pipe and RB header. I run 30% sidewinder fuel and a O.S. P3 plug. heres whats going on: the engine starts pretty good, it has pretty good power on the top end-good smoke and head temps around 220-240. when it goes from idle to full throttle, i get a huge clould of blue, it seems to rev up alright though.
My other observation- I was setting my low speed needle, i feel like im either getting it too rich or too lean. With the settings i have on it now when the engine is at normal operating temps a lot of the time when i try to let it idle for more than 5 seconds it will stall. also i have noticed that after a few high speed passes and then let it idle, the idle will be a little high then settle down after about 3 seconds stay at a lower RPM idle for a few seconds then stall. also what i have noticed too is that if i lean out the low end to help with the idle, i run my car about 1/4-1/3 throttle for about 3 seconds and let off it stays at that rpm (rpm @ 1/4-1/3 throttle) or maybe a tick under until i hit the brakes.. then if it richen it up it wont stay at that rpm it will go back to idle.. I know its not my servo.
im stumped?!
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Last edited by RoosterXp; 04-28-2010 at 05:42 AM. Reason: added content
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Old 04-28-2010, 06:30 AM   #2
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1) make sure that the servo linkages and transmitter EPA are set right with a little gap on the throttle linkage before it actually begins to throttle up after you apply it from the transmitter
2) make sure that the servo throttle linkage moves freely in the plastic hole of the servo arm
3) to me it sounds like a bit too rich on bottom
lean it a bit and lower your idle if it holds high idle

The #3 only if the 1-2 are set right.
If otherwise you need to retune.
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Old 04-28-2010, 07:56 AM   #3
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If you lean (turning it clockwise) the LSN you also have to decrease the idle gap.
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Old 04-28-2010, 08:50 AM   #4
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maybe i am adjusting it too much... I miss my RB
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