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Old 10-11-2005, 05:45 PM   #21
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Gump is right to advise to have the throttle return spring onto the Carb itself for worst case scenarios to bring the engine to idle at rest.

I do however have yet another spring that applies brakes at rest.

So to summarize, I have my Fail safe, throttle return spring, and Throttle/brake spring.

Oh yes, Fail safe do wear down. I know, I've had to replace one.
I am on the 13th year of my 2nd childhood and I REFUSE TO GROW-UP!
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Old 10-12-2005, 12:06 AM   #22
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viper can't aford 2 loses anouther run a-way to the mighty curb a the brick.
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Old 10-12-2005, 07:45 PM   #23
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the servo that i use for throttle is the JR Z4750 Ultra Race servo. it has a lot of torque and good speed, with a nylon horn. This thing is so light and easy to push, you would swear its some kind of a low torque servo or something, but its not. Its quite powerful.

the servo i USED to use for throttle, that i found too stiff, is the JR Z590M Torque Race Servo: Metal. I had to use one hell of a spring on there to get it to return when the power was cut. way too much strain for it to operate correctly.
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Old 10-24-2005, 11:19 AM   #24
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Ok as promised, heres some photos of the most basic and reliable throttle return spring setup I could come up with.


This setup required drilling and countersinking a hole in the bottom of the chassis to mount the aluminum post. The post, in my case, is actually part of the rear wing stay (a spare). Make sure to use threadlock on both screws, as the M3 screws will vibrate loose otherwise.

This setup provides just enough force to overcome the JR4750 Ultra Race servo with all the linkage connected and the battery power cut. I believe I used a Losi return spring in this case (I can't recall for sure, its been a while since I bought it). The ball cup for the throttle linkage easily snaps onto the carb with this spring in place, and theres no binding or interference issues, even with the spring resting on the carb body as it does.
For those who don't like the idea of having the spring in contact with the carb body, it can be relocated onto the set-screw side of the carb (for the Kyosho 777). The setscrew would have to be replaced with a longer M3 screw, which would need to be threadlocked in place. The spring would run behind the carb, and the post would be relocated further back on the chassis. I opted not to go with this design, as its a little more difficult to put back together with the entire chassis assembeled.

If anyone else has anythrottle return spring solutions for specific chassis. I would ask that you post them up. Preventing unnecessary accidents and injury is an important part of this hobby, and each driver should take a little time to ensure that their setup is as safe and reliable as it can reasonably be.
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Old 10-24-2005, 02:48 PM   #25
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wow nice..well hopefully today ill come out to drift a bit
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