Reply To: Carburator Fix – Help! 750 LTD S1 -82

[Kaptainkwak]

Hi David
Do not despare. I am sure we can help. My first thought is the fuel ‘varnishing’ with being stood over winter. Ultrasonic cleaning would solve that problem. The issue is definately fuel starvation on the pilot jets. This could be for several reasons with varnishing being one. Assuming the pilot jets are good and the right size the 2nd most likely reason is an air leak. Have you checked the air box to carb and carb to head rubbers are in good order and clamped properly? If they are perished they need to be replaced as they can leak air. If they are over tightened on the clamps they can become oval and not form a seal.
One way to check the carb to head rubbers is to start the engine. Turn the tickover screw up so it will run without choke. Lift the carbs and push forward. If there is a leak there this should close it and the revs will increase.
It is also worth making sure the pipes from the carbs to operate the fuel vacuum tap are in good order and well sealed.
I hope the above gives you new things to investigate.
Letus know how you get on.
KK

• This reply was modified 7 years ago by Kaptainkwak.