So I rebuild an e50 for a maxi. Setup is below
Hi flow metal air filter
70cc hi comp head
Tecno circuit exhaust
Compression: 150psi with throttle wide open
Fresh tank of gas (this morning) 40:1 mix
2 new spark plugs (NGK B7HS)
Cleaned carb twice. Fuel making it to the bowl. Spark plug is wet.
I've tried a 72 jet, 78, and 68. I turn the motor over and it just doesn't start. Clutch is engaging and all that. Doesn't putter, 4 stroke or do anything. Just makes the starting noise without catching. Timing was reset. Point gap set a TDC, and 17 degrees BTDC firing. I checked for spark and got a nice fat bright blue spark. I got it started for about 4 or 5 seconds when i started with throttle close to wide open. Revved up, spit a bunch of fuel out the exhaust and when i let off the throttle it shut down. Haven't been able to get it to catch since.
Could I have flooded the engine and there's too much fuel? Is that why it spit some out the exhaust?
I cleaned the gas tank rust with vinegar last week. 72 hours soak, flushing every day. When I was done, I ran through water and baking soda mix. Then a few gallons of water, then a gallon of gas. Put fresh gas in this morning. What obvious thing am I missing?? Did i not clean the tank correctly and its effecting the gas? Any help would be much appreciated. (edited)