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Old 06-11-2019, 05:47 PM
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Ball link set up between carburetor arm and throttle servo

Hey guys ,

What are you using as ball link and rod for your carburetor arm to the throttle servo for a 120 cc size motor ?? I don’t think I can use a 440 size ball link because that would rub against the muffler . Thx.
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Old 06-11-2019, 06:22 PM
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Hi you might specify what engine as guys who own the engine can help you. If a DA or DLE 120 I use a 4/40 ball on either one. I believe on the DA the ball goes inside the arm and you have to use a short bolt. Do not use a ball link that has a standoff.
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Old 06-11-2019, 06:48 PM
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Quote:
Originally Posted by FGNewbie View Post
Hi you might specify what engine as guys who own the engine can help you. If a DA or DLE 120 I use a 4/40 ball on either one. I believe on the DA the ball goes inside the arm and you have to use a short bolt. Do not use a ball link that has a standoff.
Hello it’s a D120. Thank you for responding I’ve always used those beveled standoffs with a ball link that goes in between the ball link and the arm , do you think I could use the ball link directly on the arm without the standoffs ? Also do you have a link to the ball link u use ? Thanks again for taking the time
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Old 06-11-2019, 07:10 PM
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I like to use these Sullivan aluminum quick disconnect ball links on the throttle arm.
https://www.towerhobbies.com/cgi-bin...p?I=LXYCH3&P=7
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Old 06-11-2019, 08:18 PM
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I have used 2-56 ball links on all my throttles they are small and I have never had 1 fail
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Old 06-11-2019, 08:54 PM
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I use 4-40 ball links and don't use the little beveled piece with no problems.---Smitty
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Old 06-11-2019, 09:39 PM
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there's nothing wrong with a 2/56 over short distances. the DA 120 arm is tapped for a 4/40 bolt, (the 70 is 2/56) so you could use a 2/56 with a 4/40 bolt, or a 4/40 and 4/40. yes, you can put the ball directly on the throttle arm. I think mine either has a lock nut or a regular 4/40 bolt, I don't remember, but it does have to be thin so as not to hit the muffler. you can Dremel off any unneeded length of bolt. hope this helps. I use the Chinese or Dubro ball links, both work fine.

RCA...i'm going to try the Sullivan connection in the future.
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Old 06-12-2019, 08:02 AM
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FGNewbie, I have had a couple of those super tight space applications like you show in your photo. They are no fun.
Something else that can help give just enough extra clearance is to use a low profile buttonhead screw instead of the standard full socket head cap screw.

Also, the miniature 2-56 or 4-40 locknuts are helpful. Nelson used to offer them in brass but most recently I believe that I got them from Microfasteners in aluminum. They can provide a little extra clearance on the opposite side of the throttle arm when the regular 2-56 or 4-40 locknuts are just a bit too large.
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Old 06-12-2019, 09:56 AM
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Quote:
Originally Posted by RCAddiction View Post
FGNewbie, I have had a couple of those super tight space applications like you show in your photo. They are no fun.
Something else that can help give just enough extra clearance is to use a low profile buttonhead screw instead of the standard full socket head cap screw.

Also, the miniature 2-56 or 4-40 locknuts are helpful. Nelson used to offer them in brass but most recently I believe that I got them from Microfasteners in aluminum. They can provide a little extra clearance on the opposite side of the throttle arm when the regular 2-56 or 4-40 locknuts are just a bit too large.
Thanks for the feedback I got some miniature locknuts
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Old 06-12-2019, 04:27 PM
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Quote:
Originally Posted by RCAddiction View Post
FGNewbie, I have had a couple of those super tight space applications like you show in your photo. They are no fun.
Something else that can help give just enough extra clearance is to use a low profile buttonhead screw instead of the standard full socket head cap screw.

Also, the miniature 2-56 or 4-40 locknuts are helpful. Nelson used to offer them in brass but most recently I believe that I got them from Microfasteners in aluminum. They can provide a little extra clearance on the opposite side of the throttle arm when the regular 2-56 or 4-40 locknuts are just a bit too large.
Bingo! That made the biggest difference but the small profile locknuts are occasionally useful as well. When I use those, I generally cut the screw flush, or close to it, with the locknut.
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Old 06-12-2019, 08:46 PM
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Old 06-13-2019, 02:46 PM
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You don't have to use ball-links on everything. A good quality clevis works fine in many small areas where a ball-link won't clear.
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