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Messages - astrubinger

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1
General Discussion / Re: Kymco and Derbi Atlantis confusion
« on: May 17, 2012, 10:52:38 PM »
Thanks Zombie. I just finished adjusting the needle valve (I think that's what it's called)... I tested it on every single setting and the setting that seems the best is the bottom notch (most rich). It still seems to bog down a bit but not like it did. I also had to re-adjust the air/fuel screw and the idle speed and everything seems pretty good now. I don't like that the needle is on the lowest notch so I may take it up a notch tomorrow and adjust the air/fuel mixture again... just to make sure the needle really belongs set so rich. My next option is to check the float but I have NO idea how to get into that.

2
Technical | How To / Carb adjustment issues
« on: May 15, 2012, 11:40:38 PM »
Hey gang,

I posted the following under the General Discussion category but now that I'm getting into the details of the issue I think it's worth posting here, as well:

Thanks for the info. So it looks as though I have a 2006 50cc Derbi. That helps. I've attached a few photos... as requested. Here's what I've been working on. I've been wanting to tune the carburetor. I found the idle speed screw and the air/fuel mixture screw. All the documentation seems to indicate that I should screw the air/fuel mixture screw in all the way, then back out the screw 1 3/4 to 2 turns out. THEN, start adjusting 1/4 turn in either direction until the highest RPM is achieved (then 1/8th turn clockwise to rich-en the mixture just a bit).

Well, first of all the bike has always run a little rough since I've had it (a month). That's why I wanted to do the tune-up. So today I got out my screw driver and attempted to screw in the mixture screw. Imagine my surprise when the mixture screw was already in as far as it would go. Besides it always smelling like gas and running rough, it's basically been running ok... especially at full throttle. Now, after I adjusted the mixture to where it SHOULD be (1-7/8 turns) it idles much smoother. However, sometimes at about half throttle it'll lag a little until I back off the throttle a bit. At full throttle it actually starts slowing down.

What did I do wrong? Should I have left the mixture screw turned in all the way? That do ya think gang?

~ Alan

3
General Discussion / Re: Kymco and Derbi Atlantis confusion
« on: May 15, 2012, 11:26:42 PM »
Hey gang,
Thanks for the info. So it looks as though I have a 2006 50cc Derbi. That helps. I've attached a few photos... as requested. Here's what I've been working on. I've been wanting to tune the carburetor. I found the idle speed screw and the air/fuel mixture screw. All the documentation seems to indicate that I should screw the air/fuel mixture screw in all the way, then back out the screw 1 3/4 to 2 turns out. THEN, start adjusting 1/4 turn in either direction until the highest RPM is achieved (then 1/8th turn clockwise to rich-en the mixture just a bit).

Well, first of all the bike has always run a little rough since I've had it (a month). That's why I wanted to do the tune-up. So today I got out my screw driver and attempted to screw in the mixture screw. Imagine my surprise when the mixture screw was already in as far as it would go. Besides it always smelling like gas and running rough, it's basically been running ok... especially at full throttle. Now, after I adjusted the mixture to where it SHOULD be (1-7/8 turns) it idles much smoother. However, sometimes at about half throttle it'll lag a little until I back off the throttle a bit. At full throttle it actually starts slowing down.

What did I do wrong? Should I have left the mixture screw turned in all the way? That do ya think gang?

~ Alan

4
General Discussion / Kymco and Derbi Atlantis confusion
« on: May 14, 2012, 11:34:18 PM »
Hey gang,
I'm working on a used scooter my sister recently purchased. Before I start asking technical questions about the machine I need some help  figuring out what exactly we have here. The title shows it's a 2007 Kymco (50cc) but the decals on the scooter seem to indicate it's a Derbi Red Bullet. The VIN plate shows the "model" as a "Derbi Atlantis" and the year of manufacture shows 2006ish (it's hard to read). I'm a motorhead from way back but my expertise is in early 70s through late 90s cars and trucks. I'm new to scooters. I'm trying to tune the carb but before I get into that I need to know exactly what I'm working on. Is this a Kymco machine?

Once I figure this out then I can start asking about the carb adjustment.

Thanks!
~ Alan

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