Will not idle?

[b dippin]

so a few weeks ago I just motor swapped my 2012 Kymco agility 125. I was able to swap a gy6 150 in with no issues. Gy6 now has Kymco carb, stator, and short shaft to make it work with Kymco wire harness. Everything is working besides keeping it running.

The stock agility 125 carb is 24mm with a 102 main jet and 0.35 pilot. I also added an Amazon exhaust(no real restriction) and uni air filter out the side because oem airbox and emissions were removed.

I can start the gy6 with the starter button and it starts easily. It runs for about 3 seconds and slowly dies as if chocking out or running out of fuel. If I let it sit for 5 minutes.. it will run a few seconds longer then initially and if I wait 10 minutes it will run let's say 10 seconds before dying. I have been reading a lot of posts and some point to adjusting the valves. Are the Jets that far off per someone with more experience than me? Looking for some direction because I'm so close to riding this thing.

*has new gas and fuel filter*

[Iahawk]

to help with jet size question, I've attached a chart from Kymco showing different OEM carb and jet sizes for the 50, 125 and 200 (really 163cc) motors. Looks like your main jet might be small...and your pilot is correct...but then again, you've increased intake airflow and have a free flow exhaust so you may be running much too lean.

[Ruffus]

Maybe smtg in it to follow, pls see link
I would suspect primarely the fuelpumps vacuum system, respectively its vacuum hoses. Right hose to right suction, etc.

https://www.kymcoforum.com/index.php?topic=31737.msg222332#msg222332

[b dippin]

Maybe smtg in it to follow, pls see link
I would suspect primarely the fuelpumps vacuum system, respectively its vacuum hoses. Right hose to right suction, etc.

https://www.kymcoforum.com/index.php?topic=31737.msg222332#msg222332

My carb was pretty gummed up when I was putting it together. I'm talking dark brown and 1/8 in deep. I put a ton of new gas in and cleaned the filter. The new fuel filter took a day for it to fill over half full in the clear filter container. I think the petcock filter might be all gummed up like the carb.

[Ruffus]

Yes, you might be right about this petcock. Out and check.

[Iahawk]

My carb was pretty gummed up when I was putting it together. I'm talking dark brown and 1/8 in deep. I put a ton of new gas in and cleaned the filter. The new fuel filter took a day for it to fill over half full in the clear filter container. I think the petcock filter might be all gummed up like the carb.

this would have been helpful to share in your initial post! Appears you're not getting fuel.