Planet Minis

110streetlegal

ok i started riding my panda around and am loving it....as long as they are short trips. Whenever i take a long run like 1/4 mile run in a higher gear it dies when i pull in the cltch it wont idle, after that its hard to start unless i let it sit. its popping with i get off the gas untill the rpms get low enough then it stops popping
it will idle just fine after its restarted, ive tryed raising teh idle speed a tad to see if that helped but nothing if its stop and go stop and go it stays runing just fine its only on extended runs
its a sheng wey carb i knwo i need a name brand sooner or later but i just dont have the money
ive taken the carb apart and cleaned it well,the float and needle work justfine petcock is new no debris in the tank
any help would be appreciated

mexicanyella

1) Are you sure your fuel supply to the carb is sufficient? Float bowl's filling properly? Float or needle/seat not hanging up? Is the dying out only with clutch pulled and throttle closed, or does it crap out at any throttle opening after a certain amount of riding?

If it's a carb problem, recreating the symptoms with attention paid toward rpm range and throttle opening will help you narrow it down.

Once you're sure your fuel supply into the float bowl isn't at fault, I'd try richening the idle mixture a bit, set the idle speed again (it will change when you change the mixture; usually slower when you go richer), and see what happens...but remember where you started from so you can get back to that mixture setting if need be. Shouldn't have to change the setting too much if it seems to idle fine to you once it restarts. It can't be too far out. If that's the problem in the first place.

I'm reacting to "popping" and "hard starting" here, which make me think the idle mixture is a little lean. But these things can also indicate ignition faults, bad spark plugs, etc.

110streetlegal

i took the bowl off the carb and opened up the petcock and the fuel started pouring out and i played with the float and it shuts off and opens up fine
i think its running rich right now because my rear shock is all "sooty"
when i pull in the cluct at speed rpms will drop i can give the throttle a twist and it will almost choke out if i give it to much throttle
does anyone know what the settings should be for a stock sheng wey carb

mexicanyella

Settings are dependent on what engine its fitted to. Maybe you're a bit rich in the midrange and lean at idle. But do one thing at a time; change two variables and you won't know what did what. Do you know how to pull the needle out of the slide and change the little circlip into a different groove? I'd try raising the clip one slot, thus lowering the needle, and seeing how it runs. That will lean out your midrange a bit.

How's it run at extended wide-open throttle?

110streetlegal

it seems to run fine in the rpms i just pulled the plug it looks kinda white so you right its running lean i guess
its been forever since ive had to tune a carb
the fuel ratio screw was 3 turns out so i reduced that to 1 1/2 tuns out
i was told by a local shop that that carb if you want it richer tun the screw in and leaner turn it out i havent played with the needle yet i have to pull the carb to unscrew the cap

schofell84

isnt that backwards? screw in-leaner, screw out-richer ... correct?

Paxracing

If the screw is in front of the slide in is lean and in back of the slide in is rich.

110streetlegal

its behind the slide

mexicanyella

This is going to sound kind of obnoxious and theoretical, but I don't mean to be that way. I am a former victim of trying to jet a YZ490. I am humble. I want to help. I want to transform the way you think, kind of like mind control only about minibike carbs.

To say "in the rpms" is not enough info with slide carbs. Throttle position is important. Wide open throttle at 3000 rpm is still on the main jet. Middle throttle openings at 9000 rpm are still on the needle. My question about how it runs wide open isn't that dependent on rpm, but throttle position, is what I'm saying. Rpm info added in helps, but throttle is the main thing, because that tells what hole the fuel is going through. It takes some getting used to, mentally separating what rpm you're hearing from what your hand is doing, but you have to look at it like that to figure out what's going on in there.

doopsx3

that's just muy loco!!!!!! But I agree with every word lol

110streetlegal

I got It figured out I tore the carb down and blew out the fuel inlet and a piece of something flew out. So the bowl was filling but not as fast as it was burning gas. I just got back from a 30 mile ride with no real problems.

Iappreciate everyones help

mexicanyella

so, is this currently a stock 110 four-speed auto? Did I miss something there? What's the performance like? How fast is your cruise/top speed etc.? Ride report, man!

110streetlegal

120cc 4 speed with a clutch
22mm carb UNi pod filter
New tb short z50 pipe
16t front sprocket 37t rear sprocket
Top speed is about 55 pinned cruises at 45