black comming from my saito - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-11-2003, 10:45 PM   #1
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black comming from my saito

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im getting some black in my exhaust, non metalic, engine is running fine, expect for when i get about 4 flights, it doesnt want to have full throttle on vertical. could it be running too lean?
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Old 08-11-2003, 10:55 PM   #2
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Thats usually a sign of an engine thats running too lean. I use a tac to adjust the high speed until the engine peaks and then back off the needle 2 to 300 RPM. Usually when you start the engine, hold the nose of the plane straight up at full throttle and if it drops even slightly, its too lean.

Also check your exhaust and make sure its screwed on tight, even a little loose it will vibrate and give off a black residue indicating that the aluminum is rubbing. It doesn't feel metalic but it could be aluminum residue especially if the muffler is not tightly screwed on or a mounting bracket is loose!
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Old 08-11-2003, 11:34 PM   #3
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thanks for the info

the muffler is really tight

it must have been too lean, i thought it was fine cause there was still lots of smoke on the ground, but if i recall it did drop rpm when i picked it up
thanks for the info
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Old 08-12-2003, 05:44 AM   #4
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Four strokes are a little tricky to set up.
They must be set on the rich side on the ground. After take-off, once you pick up speed, you will hear the engine pick-up and lean out.
If in doubt, stay a few clicks to the rich!

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