I have exactly the same problem as the video below:

https://www.youtube.com/watch?v=yMfsDp-yLjw

How is this possible ?

Do you mean the right carburateur? Because there is a extra idle speed screw. But this idle screw is locked with a nut

I just decided to proper clean and rebuild the carbs again for best result. I cleaned all parts with my ultrasonic cleaner. I also bought 2 revision kits for the carbs:

Fron cylinder:
http://www.ebay.com/itm/251669035275

Rear cylinder:
http://www.ebay.com/itm/251669036743


These revison sets are different, be aware of it !

I adjusted the float hight on both carbs (measured without gasket) to the described dimension (15,8 mm +/- 0,5 mm).



The next thing i want to do is to adjust the butterfly on both carbs, so the engine can start. But i have some questions about that:

-If the bike is running idle, does the butterfly have to be open a little bit on both carbs? If yes How much wil that be?
-Do i adjust this opening with the left idle screw?


The next video shows how de carbs are at the moment. The first butterfly opens en de second one a little bit later. Don't they have to be open at the same time ?

https://www.youtube.com/watch?v=X1tGtJ2Vv9Q

If i turn the synchronize screw all the way in (as far as possible) the butterflys will be opening at the same time, but i dont think that is oke.



So my main question is how do i adjust everything so i can start the engine

i just removed the left idle screw, turned de synch almost all the way in. Now the opening is on both sides equal, but i have only 3 turns left on the synch screw. So that means i have a little range to adjust the synchronization with running motor.

I hope this will work now and otherwise it has to be the roller inbetween the carbs. This roller has a diameter of 15,8 mm en de gap is 16,2 mm. When you open the right butterfly, the roller clears the clearance ( 16,2-15,8 = 0,4 mm) and after that starts to opening the left butterfly. Maybe if i can make de clearance smaller bij making a new roller the synchronization screw has more turns to adjust it with running motor.

Thanks for help anyway  

De left idle screw needs to be screwd in until it is slightly touching the arm, am i right ?

in which direction ? Left ore right ?