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Idle speed too high with OK carburetor opening

Idle speed too high with OK carburetor opening

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Old 06-27-2018, 06:53 PM
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Questions?? Idle speed too high with OK carburetor opening

Hi everyone, I have an Redcat Earthquake 3.5 which was broken in about 2 years ago and I did not have a chance to play with until now. However, was having trouble starting it after such a long break and I suspect I messed up some needle settings. I haven't touched the high-speed needle, just idle and low-speed. For the idle speed, I removed the air filter and checked the opening, it seems to be around 1mm or smaller. My symptoms are:
1) When I pull the starter, the wheels want to turn as well, so I have to lift it a bit to start. It wasn't happening before, not sure what's changed.
2) Engine starts OK
3) Idle speed is way too high
4) When I hit the brake, engine dies

Please help, thank you.
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Old 06-27-2018, 08:57 PM
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Check the clutch and clutch bearings
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Old 06-27-2018, 09:57 PM
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Broken clutch spring(s) and idle gap too big. Idle gap typically will be .5mm-.8mm. The smaller the better.
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Old 06-28-2018, 03:59 PM
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Thank you Soyer and SlowLST2. I think my needle settings are now fixed. Assuming the clutch is broken or melted, is that also the reason why the wheels would be turning on idle? Thanks.
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Old 06-28-2018, 04:09 PM
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Originally Posted by armykid View Post
is that also the reason why the wheels would be turning on idle? Thanks.
In a real car with manual transmission you also need to press the clutch pedal to stop the wheels from turning and stop the car w/o staling the engine. These small clutches have a spring that disengage the clutch at a low rpm.
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Old 06-29-2018, 03:40 AM
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Could be a rusted bearing since it sat a long time
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Old 06-30-2018, 10:38 PM
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The spring in the clutch was broken to pieces - thanks everyone. The shoes were OK, slightly worn out but not melted, as they were metallic. Replaced them anyway, since I got a new pair with a new spring. What is the expected lifespan for the spring/shoes? Does it make sense to order a few more in advance?
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Old 07-01-2018, 03:19 AM
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With alum shoes iv had so many springs break, guess its the transfer of heat or after while they rub on clutch bell... alum shoes need to be deburred every so often like every gallon or less....
i put hpi molded shoes and love the throttle responce more and no more broken springs, i think they are teflon or somthing, not sure why but i liked them more...

maybe i just had bad experience with cheap and bad alum shoes ...

there are alum shoes with hole in them that the spring tab goes in i think those would be the best, no edge that can rub on the clutch bell and cause any failure...
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