Throttle/Carby Help

[MLP]

Hi Folks - This is is my first build and I'm excited to almost be done with it! Thanks to to this forum I've been able to solve most of my issues.
I have two problems that are probably related, maybe you can help!
I can get the engine started no problem and cruise my neighborhood at a low speed.

1. But I get no response from the engine when I turn the throttle.
2. If I pull the clutch in, the gear disengages well but the engine revs up full throttle immediately. Similarly, with the the clutch out the throttle is "stuck on" if I don't stay on the breaks to control my speed.

However, when I take the carb top off and expose the throttle mechanism (like pic), I get a totally normal action on it, it pulls up and the spring bounces back.
So I can't find anything to fix in the throttle mechanism.

I'm not entirely sure how to set the idle on the carb so I can't confirm if I have it set nice and low like I would like.

Thanks for the help y'all!

 

[bluegoatwoods]

Okay. If I understand correctly, then, your throttle slide, spring and cable seem to be working properly when that top is off.

But the running symptoms you described would indicate a slide and needle that are not bottoming out the way they should.

My feeling is that when the throttle slide is installed there's something holding it in the up, wide-open-throttle, position.

So I'd make sure that you're installing that slider properly. It looks like a different model from mine. But I'll hope that what's true on mine is true on yours.

If you look down into that throttle throat you'll see a tiny little 'nub' in there. There will also be a 'slit' in the side of that throttle slider. That nub must slide into the slider slit. (Dig my terminology, man.)

If not, then you're stuck on wide open throttle.

 

[MLP]

thanks for the repls, yes your understanding is exactly right...

Hmm I will go look for the nub and the slit (i've got the carb taken all apart right now) if you could describe that a little more, or include a pic, I would REALLY appreciate! Thanks for your input.

 

[MLP]

By Golly you were right! The black slit over the little nub, that's all it was!