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Check out the TwinMax Electronic Carburetor Balancer. There are more details and instructions.
We sell the Twinmax complete with battery, hoses and reducers for any bike with vacuum takeoff spigits and old Britich twins with a crossover between the intake manifolds.
Our Twinmax Hot Line is open even on weekends and at night. And specific appointments can be made as well. I.e. Thursday night at 7:30 pm. We can help.
Peak efficiency is a goal that is seldom obtainable. However, the Twinmax system, an electronic differential depression gauge will get you to peak efficiency. A carburetor and fuel injector throttle body balancer. Light, compact, transportable and accurate to 1mm of mercury. Works on all engines with multiple carburetors or throttle bodies, not just motorcycles. Donít leave home without it.
1. Ensure there is slack in the cable from the twistgrip or throttle pedal. If there is not a master idle screw, ensure all cable or rod adjusters have some free play-this makes sure that all carbs are sitting at idle, i.e., with their valves shut. Position the TWINMAX conveniently on the bike, such as on the saddle or on top of the frame and switch it on.
2. Connect the tubes to the carbs-one on the reference cylinder and the other on to one of the other carbs.
3. Turn the SENSITIVITY knob fully to MAXI.
4. Adjust the ZERO know until the meter needle is precisely through the middle of zero on the scale; this adjustment is very sensitive and very important.
5. Turn the SENSITIVITY knob back to MINI.
6. Start the engine and allow it to settle to a steady tickover. Don't be afraid of blipping the throttle-this makes certain the throttles are properly seated on their stops.
7. Slowly turn the SENSITIVITY knob until a deviation shows on the scale. The less out of balance the two cylinders being tested are, the more you will have to turn the SENSITIVITY knob to show an imbalance on the scale.
8. If there is present reference cylinder, quickly check each cylinder with one tube and choose the cylinder with the minimum deviation from zero on the scale as the reference cylinder.
9. Adjust the idle/slow running screw on the carb being adjusted (not the reference carb) until the meter shows an equal deviation on each size of zero. The meter is very sensitive, so care must be taken to use small increments of adjustment. Blip the throttle each time you make an adjustment to ensure the throttles are properly seated.
10. Repeat for all cylinders.
Once all the carbs are balanced at idle, they must next be balanced on throttle opening. As before, balance each carb against the reference cylinder.
Note that the balance must be checked as the throttle is opening and the engine is accelerating, NOT as the throttle is being closed and the revs are dropping. With some practice, you will be able to do this efficiently, and you will also be able to check the balance at a constant throttle opening.
You may find that a cylinder will balance fine on the opening up stage, but not on a constant opening; the skill lies in being able to interpret this and achieve a balance between one and the other.
11. Start with the SENSITIVITY knob about the middle of its' range. Run the engine and this time open the throttle gently and run the revs up to 3000 or 4000 rpm and make a note of any deviation on the scale; again, if it is not pronounced, increase the SENSITIVITY.
12. Now adjust the carb throttle actuator-this is either a cable or screw acting onto a plate or rod and may be hidden inside the carburetor top. Be careful to make only small adjustments. Note that if there are locking nuts on the adjusters, doing these up will affect the setting so double check the results and blip the throttle to settle things out.
13. Repeat for all the cylinders.
14. Adjust the slack in the cable from the twistgrip/pedal to manufacturer's specifications.