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Nitro RC Car and Truck Discussion Discuss nitro RC vehicles

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Old 03-25-2005, 04:47 PM   #1
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can any one help me

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hi i am new to the whole nitro rc thing and i just bought my self a used nitro car and it runs and every thing buy i think its idleing to high and i looked on the hpi site to figure how to turn down the idle but the wheels keep spinning and the only way it will stop is if i hold the brake and then it still idles high so i was just wondering if any one could help me out a bit thx
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Old 03-25-2005, 08:27 PM   #2
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carb settings...

Hello Mike. Welcome to the rc hobby!

Well i myself have a nitro buggy with a Fantom FR.15 engine. I'm not sure what engine you have but i think on all buggy engines, there is a screw on the carburetor that will determine how far the carburetor barrel will slide/rotate (depending on if it's a slide carburetor or a rotating carburetor) towards the off position. What you need to do is find where this screw is (the manual to your engine should say this or if you don't have the manual, go to the manufacturer's website and download a manual) and turn it a few turns with the engine running. You will either hear the engine speed up or slow down. If it speeds up, turn it in the opposite direction until it will idle reliably without trying to spin the wheels.
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Old 04-06-2005, 11:15 AM   #3
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Without knowing the engine type or car model, we'll assume you have a nitro star .15, so the first place to look might be here:

*If you can find your model's documentation on their website, of course use those settings, but here's a good starting point if you can't.*
When you take off the air intake/filter you will see the opening that lets the air into the carb. This opening should usually be about 1mm wide when your throttle is fully closed. Next, the "mixture control screw" or low speed setting should be flush with its casing. When you screw it in completely (not too tight just when you feel resistance) and then unscrew it about 3 turns, that should bring you to that 'safe' factory setting. Once it's set up this way, try and start it up (put the air filter back on first, of course...) If it doesn't start up, then you can slowly turn the throttle stop screw (to make that air intake opening slightly wider) until it does start, and then adjust so that the engine idles without engaging the wheels. You might need to let the engine warm up a bit before making the final settings.

At that point you'll need to get into full blown fuel mixture tuning based on amount of visible exaust both at idle and full throttle. Important thing to remember is that to be safe, make sure you ALWAYS see at least a little smoke (not TOO much), even at idle. You'll usually find something called "break-in settings" in engine documentation, that is considered a safe setting. if you don't see any smoke, then your engine might not be getting enough fuel/lubrication, and it will get damaged.

If your idle speed is properly set but the wheels still spin when no throttle is applied, the the problem is probably in the clutch area (seized bearings or something of that type). then you'll have to remove the engine from the car and take the clutch bell off and check it out.
Hope this helps!
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