Need help tuning!

[sad_rocc]

Pt. 1
I'm fairly new to tuning engines with a hi and low speed needle. For my stock SH .21 motor (from a PRP Swift 1/8 buggy), the low speed is the screw in the bronze casing and the hi-speed is the one at the end of the slide carb right?

Right now, I have a decent stream of smoke with a little fuel spray at idle, but when I hit the throttle it just chokes and dies. I assume this means my idle is good but the hi-speed needle is way too rich. Am I right?

Pt. 2
I got it so at idle it's burning just before it starts smoking. As soon as I hit the gas, I get tons of smoke and the engine screams. If I let off the gas though, even a tiny bit, it dies. Sometimes at low speeds it will hiccup and die when I'm holding the speed low and constant. What am I doing wrong?

 

[vbgagnon]

You've got it backwards. The lsn is where the slide is on the carb, and the hsn sticks up where your airfilter ties on. I'd say that your a tad rich on the bottom and way too lean up top.

Try just tuning the hsn counter clockwise 1/2 turn then try it, then go 1/8 turn either way to get it just right.

 

[sad_rocc]

Ah, yeah that would be a bit of a problem! Since I was wrong on this, I just want to double-check. For both needles, richening is when you turn them counter-clockwise and leaning is clockwise correct?

 

[bashaholic]

Correct, also do some high speed runs and get your HSN tuned first then go back and tweak your LSN until you get good performance off the line.