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Post by lastdinosaur on Jun 9, 2014 23:02:10 GMT -5
![]() I have a 50cc scooter, tonight for some reason, seemingly out of the blue, the thing began to accelerate right after I turned it on. No throttle depressed, as soon as the engine comes on the back wheel starts spinning, fast enough that it would drive away from me if I got rid of the kickstand. I tried to check around the idle screw area, bear with me as I can't take a picture atm so I have to use a picture already on the internet to describe my situation. I'm sorry but I have no idea what most parts are called. OK, so this may be confusing, but here's a picture to help illustrate what I saw. Page 12 bottom (left) image. www.deejayssmokepit.net/Scooter/Manuals/OtherScooters/dawgscootermanual.pdfRight under the idle screw there is that circular yellow-ish component. Well mine was not touching the idle screw from underneath. I loosened the nut that is to the right of the finger in that picture (follow the silver cable), and this caused that circular part to move so it was touching the bottom of the idle screw. Tightening it makes it so it does not touch the idle screw. Is this how this is supposed to be...? Also, that black rubber thing between the nut I'm talking about and the yellow circle-ish component, is that supposed to be wedged on to anything? Mine just floats freely, and there is also a spare nut just hanging next to it doing nothing. They can move freely up and down the short part of the cable that seems to feed into that circular-ish yellow component. Is that typical? Did the scooter start to accelerate while idle because the nut somehow became tighter, or is this whole situation a weird mess? |
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Post by 90GTVert on Jun 10, 2014 6:15:01 GMT -5
 Both nuts need to be secured. The long threaded section is used to adjust slack in the throttle cable. If adjusted properly you should have just a tiny bit of slack. If there isn't any slack it can pull the throttle and raise idle RPM.
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Post by lastdinosaur on Jun 10, 2014 6:34:37 GMT -5
Geez that's a super helpful video, thanks.
So for whatever reason on the used scooter I bought, it seems that the threads were just BARELY pushed through the bracket (16:01 in the video), to the point where there isn't even enough threads to secure the nut on the right side.
So I guess for the past couple of weeks I've been riding around with one of the nuts just dangling on the cable - wow.
So you want just a tiny bit of slack, but for the idle screw to remain being touched from underneath? I'm a little lost on what it is you adjust to create that slack though - do you just move the threads forward or backward and then when the slack is right tighten both nuts?
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Post by 90GTVert on Jun 10, 2014 8:10:35 GMT -5
Yes, just a small amount of slack. If the screw isn't touching then your cable adjustment is controlling idle speed rather than the adjustment screw. Basically it's like the throttle is being pulled all of the time.
Yes, you move the threaded section of the cable so you get a small amount of slack so the adjuster screw is touching and then tighten both nuts to keep it in place.
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