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04-06-2010 07:01 PM  8 years agoPost 1

rrKey Veteran

Ottawa, ON - Canada

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So my Radikal is nearly ready for it's maiden flight(s). It is my first gasser though, so I was hoping to get a little info on tuning.

I've done a fair bit of reading on gasser tuning, but it seems there's a lot of conflicting info out there. I'm a procedural kinda guy, so what sort of procedural approach would you gasser guys take to getting things tuned in right?

Here's a few questions:

1 Do you start by tuning the high or the low needle? Why?
2 What effect does oil mixture have on tuning? Can you go leaner if there's more oil in the mix?
3 What sort of temp (ballpark) should I be aiming for? Where should I measure said temperature?
4 If I do end up running lean on the high end briefly (a couple climbouts) will it damage the engine?
5 Any big screaming warning signs that I'm going to destroy the motor due to lean mixture? ex: On a nitro you look for no smoke, and bogging under load.

FYI: This motor has already been run, and just finished breaking. I plan to run a 40:1 mix.

From what I've read starting at 1 1/2 turns out on both needles is generally a safe starting point.

For procedure I was thinking of getting the thing idling, then leaning the low end needle until it starts to run crappy, then backing it off 1/8 - 1/4 of a turn. After that, just doing climbouts and progressively leaning the high needle for full power until I get into bogging due to a lean mixture, then again, backing it off 1/8 - 1/4 of a turn.

Sound reasonable or am I going to break things?

Any suggestions are appreciated.

If it can't hover, it ain't worth flying.

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04-06-2010 07:34 PM  8 years agoPost 2

rrKey Veteran

Ottawa, ON - Canada

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Oh, one other question too.. Will more oil in the mix effect performance at all? Say running 64:1 vs 32:1, would there be any noticeable difference in performance or is it just added protection for the motor?

If it can't hover, it ain't worth flying.

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04-06-2010 10:09 PM  8 years agoPost 3
fla heli boy

rrElite Veteran

cape coral, florida

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depends on your oil. I've run everything from 32:1 to 100:1 depending on the fuel and the oil type and brand in my race bikes.

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