Motorcycle and Scooter appreciation

Replaced rubbers in the top of the carb just now. All passages seem to be clear. Rebuilt the carbs and ensured all jets are clear.

I'm going to make sure both float bowls have right fuel height now and that butterfly's and cables are synched.

I have discovered a damaged mixture screw o-ring. Could that have been the cause? Seems unlikely. I'm going to have another go tomorrow morning and then check the coil.

I can now confirm it is not:

• pilot jet passage
  
• needle height
  
  

Could be:

• cable synch leading to butterfly openings
  
• fuel-bowl fuel height
  
• mixture screw o-ring
  
• coil
  
  

Thanks, MrAndyJones. I may take you up on the offer next week if my fettling and new mixtures screw o-ring do not solve it.