Hello everyone
I have two irritating problems with my 350 Saturno, which you may recall I have recommissioned after it came to Australia from Japan after a long time idle.
Problem 1 - poor idle and transition. I cant seem to get the idle mixture setting right and there is a terrible hesitation at 3800-4000rpm. If you rev the bike out it is fine but if you hold it at 4000rpm it stutters very badly. Carb has been thoroughly cleaned. all jets and the needle are new and factory spec as per the workshop manual (K54 needle 3rd notch, AB262 nozzle, 128 main, 58 idle, 40 choke). Float is new but 8.5grams not 14grams as 14grams not available and Gowanloch Ducati told me it would make no discernible difference. Float is set as 24mm as per manual. Idle mixture screw is 1.5 turns out but try as I might I cant find a setting that gives a good idle and gets rid of the 3800rpm stumble. Bike runs well all the way to redline and feels good otherwise. When I turn off the fuel the idle speed increases to 2000rpm as the float bowl empties and then dies when fuel exhausted. Any ideals? I'm stumped.
Problem 2 - sometime the bike just dies. It literally just stops with no warning. It did it 3 times yesterday on a 160km ride in 35 degree C heat. Will not re-start. Then after 5-10 minutes it will fire up. Fuel definitely flowing to the float bowl. Feels electrical rather than fuel system as there is no hesitation before it dies.
Would really appreciate your comments on these issues.....its very frustrating.