Originally posted by grampi
As I have said a million times before, the purpose of the spring is not to pull the servo back to idle. Let me ask you this. If your throttle lingage becomes disconnected from you carb arm, what good is the spring going to do if it's attached to the servo arm? It isn't going to do a thing. Now if it's attached to the carb arm and the servo arm comes off, breaks, or any other part of the throttle linkage becomes disconnected, the spring will do its job by pulling the throttle back to idle. The only proper way to move the servo to the idle position is with the use of a fail safe. Yes, the servo is always going to have to overcome the spring, but the spring should never be strong enough to override the servo.
80% of the time of failare, your battery or wire will somehow be damage, weather the wire get caught up in the gears, or it drag on the ground, bad connection, bad soldering job, what ever, most likely it's a 10% chance the servo arm will break off. I understand it popping off, I have seen a lot of drivers forget to screw on their servo arm, but thats driver error. Get aluminum servo arm or something, and breakage won't be a problem, but the spring not returning the the servo back to idle with out any power going to it, is a problem. I do have a trs around my carb, and it says on the engine at all time. I have a box of o ring that I use for TRS and a few bag of springs. I rather have it do a full job than a half job. Half job is having the spring only useful when the throttle control arm/lever is free, a full job should be able to move the servo with no power to it and still keep the carb close when it happens to be free. We are just letting you know the correct way to set up a FULL use of a TRS. Don't depend on your fail safe to bring the carb back to idle when the power is gone, fail safe are useless with no power. According your your reply, thats what you mainly depend on, and only depending on the trs to close the carb in event of the linkage comming off.
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