balancing carbs

Here ya go Simon ;D

Balancing two-stroke twin carburettors.

It helps to syncronize the carbs and eliminate or reduce any mid-range flat spot.

TOOLS NEEDED;
You will need two pieces of flat wood / plastic approximately 10 centimetres in length, 5 millimetres in width and thick enough not to bend. I use old ice lollysticks, cut to size. The bike needs to be upright – NOT on a sidestand – so you will need a centrestand or paddock stand or another method of keeping the bike upright. Also an 8mm and 10 mm spanner or good adjustable.

· Remove the rubber tubes that join the carbs to the airbox, or take off any pod filters (K+N or similar)
· Slide one piece of lollystick into the rear venturi of each carb, going far enough in to just touch the back of the needles, then out a few millimetres – get the depth the same on both carbs.
· Kneeling on the right hand side of the bike (with the ignition OFF) slowly open the throttle whilst watching the lollysticks closely. You need to get the sticks in line with each other in your line of sight. You no doubt will see one stick `dip` before the other now – you`ll be surprised by how much….
· The cable on the carb that’s `dipping` its stick second should now be adjusted.
· To adjust the throttle cables you will need to loosen the adjusting nuts at the top of the carb. Initially you`ll probably turn the nut through complete 360 degrees but open and close the throttle every ½ turn too to check the amount of `dip`.
· As you get close to balancing the `dipping` of the sticks you`ll only be turning the adjusters 1 face of the nut at a time – maybe even less.
· Once the sticks dip at the same time, tighten up the locking nuts on the adjusters, and remove the lollysticks….. now open and close the throttle FULLY and rapidly in quick succession.
· Replace the sticks in the carbs and re-check for parallel `dipping` … if they need adjusting further, repeat as necessary.
· Once you are happy, remove the sticks, replace the rubber connecting tube / pod filter and start the engine …. Be careful NOT to use the throttle harshly – but turn the handlebars fully from lock to lock…. Should the revs rise when you do this, adjust the free play of the throttle cable at the twistgrip end – NOT the carb end.
· Once you are happy there is no more adjustment needed, you can then go and test the bike on the road.