Gurgle at 1/4 throttle: Carb Tuning?

[dantastik]

I want to start by thanking everyone for keeping this forum running, it has been a tremendous help in tuning my scoot. I am becoming a scoot tuning addict.

I got the scooter running again today after the tranny melt-down. I noticed that at about 1/4 throttle it makes a gurgling/rattling noise that seems to come from the carb side. What carb adjustment should I make to richen this portion of the throttle?

Past 1/4 throttle it sounds fine.

Also could someone give a quick rundown of the carb adjustments, what they do, and relative positions.(i.e. needle, A/F, Idle) I would be nice to have all this info in one thread.

Thanks again for all the assistance.

[xraydino]

Dan, check this out and read several times before you start to tune. http://www.provoscooter.com/vbull/article.php?a=68

[dantastik]

Thanks Dino, that has alot of great information. I am going to do a proper plug check to get the carb dialed in.

What about starting positions for tuning. I have read different things like 1.5-2.5 turns out. What is a good starting place for the A/F and Idle screws?

[xraydino]

Lots of threads say about 2 to 2 1/2. Making those fine adjustments gets pretty fustrating. I'm pretty far in, maybe only one turn out. I'm not really 100% tuned with my carb but, getting close. It takes time an patience. The moderator how to section in the blue bar above definately has some worth while reading material.