So I fully loosen the throttle stop bolt at the top and adjust the idle rpm to 850 using the lower idle mixture adjustment?
Lean_Angle,
That's not quite right. You are asking quite a big question here which requires a long explanation to fully understand how to tune the carbs. There are a couple of procedures in the FAQ section you can look at and lots of previous threads to search but in principle you are doing things in a certain order and this assumes a tune up to a running bike rather than setting carbs up from scratch which is more involved.
1. balance the carbs for equal vacuum at idle using the throttle stop screws. This is to ensure both throttle plates are open an equal amount. This is a very sensitive adjustment where the vacuum will respond to the smallest turn of the screw you can make.
2. Adjust the mixture screws for highest idle speed. It might be best to skip this step in the first instance as unless the screws have been recently disturbed there is no reason to suppose they need adjusting and as it's the most subjective adjustment it's the easiest to mess up.
3. If the mixture screws are adjusted go back and do 1. again and if necessary reset the idle speed to the target figure 1050 RPM.
4. Once you have good balance at idle open the throttle slightly and check for equal vacuum balance at 1500 - 2000 RPM. This is checking
for equal pull on the 2 throttle cables. Slacken off the cable adjuster lock nut on top of one carb and turn the adjuster to achieve equal vacuum. This is a very sensitive adjustment so you turn the adjuster by a very small amount and then waiting a few seconds to see the effect on vacuum balance. Tighten the cable adjuster lock nut and once finished ensure both cables have 1 - 2 mm free play with the throttle closed.
That's it in brief but suggest you read some previous threads on the subject before diving in.
