Gy6 50 to 100cc Tao Tao atm-a1 50 scooter. I've tried:

  • Going up and down on jet sizes
  • Cleaning carb
  • Replaced carb
  • New pod filter
  • Advance timing 2 degrees
  • New cdl
  • Checked fuel flow from carb
  • Changed fuel filter
  • Added carb cleaner to gas
  • Added isopropyl to gas
  • New coil
  • Tached the air fuel
  • Double gasket on cylinder because of 44 stroker
  • Set float
  • Raised and lowered clip on pilot needle
  • Hooked and unhooked the choke
  • Checked timing
  • Set valve clearance
  • Torqued head
  • Changed intake manifold

and I'm at a complete loss. It's still bogging down and backfiring. Please help me.

  • Have you checked the quality of the fuel? any water contamination?
    – Solar Mike
    Aug 21, 2019 at 10:30
  • Looks like you've tried EVERYTHING concerning fuel ... how much have you looked at the ignition system? You tried advancing it 2°, did you try retarding it 2° (or more)? Also, have you read the spark plug? What is it telling you? Aug 21, 2019 at 11:11


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