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Old 03-26-2021, 06:43 AM   #1
Lynn21
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Default Need help: thumb throttle sticking on Honda 420

Should I Take the top off of the small box above the thumb throttle and oil it or spray it with a lubricant? Iíve got 3 in 1 oil and berrymans spray, will that work? Or should I do something else? Donít want to go to YouTube. Thanks.
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Old 03-26-2021, 07:37 AM   #2
easeup
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you can try that first cant hurt.
cable terminal points could be loose or cable rusted and could need replacement. you gotta go look
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Old 03-26-2021, 07:43 AM   #3
KDinTX
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I've always used spray graphite for throttle cables, open the top and stick the straw into the cable and spray it while working the cable back and forth.
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Old 03-26-2021, 08:14 AM   #4
JhuntsAlot
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I have seen a couple things cause what you are seeing.

Most often, inside the cable is gunked up or starting to rust. Especially if you do or have done any kind of mudding or crossing deep creeks. Just need to take the cable off so it can do its full travel and load it up inside with a lubricant and continuously move it to try and break down the build up.

The second thing is the vacuum piston inside the carb being scared up and its preventing it from going back down. This one is not good, because it means your air filter has not been working and you have had a lot of stuff going into the cylinder.

But it could be other things like a broken spring or something like that. Maybe even some broken strands that move into the casing when opening throttle.

Hope this helps.


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Old 03-26-2021, 08:15 AM   #5
SaltwaterSlick
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Quote:
Originally Posted by KDinTX View Post
I've always used spray graphite for throttle cables, open the top and stick the straw into the cable and spray it while working the cable back and forth.

This right here... If you take the "top" off, remove the cable from the thumb leaver and try to spray graphite inside the cable housing while moving it back and forth as much as possible. Keep working it until it moves freely and the spring return on the other end retracts the cable without hanging up...


If you cant' get it freed up, replace the cable. It's an easy job.
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Old 03-26-2021, 12:34 PM   #6
Lynn21
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Thanks guys.
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Old 03-26-2021, 01:02 PM   #7
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If you do end up changing out the cable, consider converting to a twist throttle. it is much easier to drive for longer time periods.
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Old 03-26-2021, 04:41 PM   #8
Lynn21
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What’s a new cable cost?
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Old 03-26-2021, 08:22 PM   #9
SaltwaterSlick
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Fiddeene bucks delivered to your door ...


https://www.amazon.com/All-Balls-Thr...s%2C239&sr=8-3
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Old 03-27-2021, 06:40 AM   #10
SRK14
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Iíd follow the cable and see where itís getting in a bind at. 420s are fuel injected so it wouldnít be a carb issue. Iím betting a stick or something came from underneath and interfered with the cable operation. Iíve never had a Honda atv throttle stick, but I have had cable problems like above mentioned.
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Old 03-27-2021, 08:27 AM   #11
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Quote:
Originally Posted by JayB View Post
If you do end up changing out the cable, consider converting to a twist throttle. it is much easier to drive for longer time periods.
I never have understood, the thumb thing...........
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