Are you using the plug that can in the kit? If it's one of those cheap Torch plugs, That could be the problem. Get a good NGK plug. Also check the plug wire cap to see if it has a resistor in it.

Get rid of the 30mm nibbi. That will solve all your problems. It's way too much carb for an otherwise stock cg250. I have a fully modded engine, cam, big bore, ported head, and I run a vm26 clone, which is basically the stock carb, but with Mikuni jets. Example: https://www.amazon.com/Hessenboom-Mo...%2C166&sr=8-31

If you absolutely must keep it, your pilot is too big. Use a 35. At most a 38. If you are stock a 115 main should do the trick, but with the PE30 having reduced velocity it often requires much bigger jetting than would be normal, so maybe have a 120 on hand as well.

Did everything here, and after cranking it until the battery died, then kicking it a bunch, it started up! I let it run for a few minutes at a really high idle just to let it warm up, then started bringing down the idle screw. Throttle response was perfect and idle was a bit high so I brought it lower. The bike died. Now it won't fire back up. Going to recharge the battery, but any ideas for what might be going on? Spark plug was pretty black so I turned the air/fuel screw in half a turn and cleaned the plug.

I was also getting serious kickback before I started it, but not anymore.

Re reading post # 1, are you positive that there’s no water in the fuel? Just my thought…

You said "the battery it had was too small". I didn't read anywhere that you replaced it. Likely cause of weak spark and hard starting...

What RPM was it idling at when it was running? And what RPM did it die at?

Water in the carb is definitely a possibility, especially since it was running before the car wash. But it was running after the carwash too! So...

A motor can actually run with a discharged battery, no problem, as long as the battery isn't shorted inside, grounding out the system (doesn't sound like it here). Spark actually comes from the Coil with power and trigger from the stator through the CDI.

It would be good to get a reading on the charging system if it decides to start again. You may need an extra pair of hands, but get a voltmeter on that battery when it is running... 13V, 14V??? This would help rule out the reg/rec/stator.

If that checks out, did you install the new coil?

I did have a bad stator in a Suzuki GS850 that still sent a good trigger signal but wasn't generating power. So the CDI was run on the battery until the battery discharged. Then it stopped.

You also said something about kickback, which could be the CDI going wacko. But you said you were testing a new CDI before.

If you did, I guess the CDI didn't fix it. I'd recommend assessing that charging system. The only thing that didn't come in your kit is a new stator/pickup coil. A bad stator could be the problem. You've replaced everything else, right?

https://www.chinariders.net/showthread.php?t=34080

Any luck?