Diagnosing Tuning tips: - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-14-2005, 05:25 PM   #1
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Diagnosing Tuning tips:

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Was waddling around the net and found this accidentally

Diagnosing tuning tips:

1) Start engine, and warm it up by running it around for a few minutes, and then let it idle for 10 seconds.

Testing low-end speed needle = Burp the engine (quick jump the throttle as if you were trying take off fast)

If the engine stumbles from idle before starting to rev-up:

It is too rich (too much gas), lean the low speed needle 1/8 turn, do more test runs.

If it suddenly dies:

It is too lean (not enough gas), open the low speed needle 1/8 turn, do more test runs.

The low end ‘5 second rule’:

If you give it a blurp or run it and then stop, after 5 seconds after idle, LISTEN to your engine:

If it revs up by itself in RPM’s after 5 seconds from idle, then it is too lean (not enough gas) = richen it

If it revs down by itself in RPM’s after 5 seconds from idle, then your low end is too rich (too much gas) = lean it if needed

Note: When an engine goes to idling, your engine will usually drop down rpms after 5 seconds which is fine, but it should NOT rev up.

The perfect setting is where it will not idle down or idle up after 5 to 7 seconds after idle.

Testing the high-end speed needle settings:

Rev the engine to do some high top-end speed:
If the rpm’s increase slowly (not very responsive) and possibly dies:
It is too rich (too much gas), close the high speed needle 1/8 turn (lean it), do more test runs.

Additionally you may also need to increase your idling screw

If the rpm’s increase super fast, but rev up even after you let of the gas

It is too lean (not enough gas), open the high-speed needle 1/8 turn (richen it), do more test runs.

Note: When a high speed needle is too lean it makes a weird NOTICEALBE noise on high rpms

The perfect setting will allow you to get instant throttle response from idle without the engine flaming out, turning off, or bogging down. Your prime setting will also have a consistent idling speed, plus your top ends speed will be smooth and responsive.
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