from stock 17mm Carb to 19mm carb

[scooterman11]

Hey guys so i got a 19mm gy6 qmb139 carb for my 08 agility 50 removed the stock 17mm
and wasnt sure if the new carb needed to be tuned and also i feel like my automatic choke is not working is there a fuse because the choke unit is brand new along with the carb please let me know asap its really bothering me and i want to get it figured out
thanks Mitch

[Peters]

Did you change the main jet? The stock jet for a 150cc will be way too big for a 50cc.

Why do you think the choke isn't working. Will it start or not?

[Peters]

What kind of mods do you have?

[scooterman11]

I just got the carb today and the 19mm is made for  my scooter
The reason i dont think the choke is working is because usually when i start it,the choke helps it, it wants to idle when i finally get it running i hope i just need to tune the screw on the side of the carb, and would it be possible that i need to put on my after market leo vince pipe

[scooterman11]

the only mods I have are A leo vince pipe and the new 19mm carb which i just got today

[streido]

I would still check what size the main jet is, unless it said on the box?

The leo vince shouldnt matter, take it you have some exhaust on now tho?

[scooterman11]

It will start up using 1/2 throttle and run it just wont idle even after it is warmed up. I've also checked valve adjustment, and compression but with no luck . it just won't start on it's own.

[blue]

if you can find a squeeze ball to put on the gas line that well work great. I have one on mine and all I have to do is give it a few pumps and the scoot starts right up. that way you dont need the choke.

[scooterman11]

That's a great idea,  but the other issue is keeping it running when I let off the throttle

[zombie]

You Have to adjust the mix screw on every engine.