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Some folks like the 944 spark plug tool for removal of the plugs. I know that the original 66 912 spark plug tool work fine with my Weber manifold. However, I may have the smaller Weber manifolds. My Webers have been on the engine for over 40 years.
If the Webers are in good shape. They are just as easy to tune as any other of the carburetors. You will need Webers Sync tool. The Unisync will work but the Webers is more actuate.
I start with cylinder #1 With the engine warm and running and the linkage disconnected. Turn the idle mixture screw gently all the way in and then turn it out for two turns. Set the weber sync (WS) and read the meter. Then go to number #2 Cylinder and turn the idle mixture screw all the way in and then turn it out 2 compete turns and read the WS meter if different than #1 then adjust the Idle mixture screw in or out until the meter read the same as number #1. Then do the same for #3 and number #4 rev the engine a little to reset the carbs and then check # 1 again and then the other cylinder and if they still read the same on the WS meter then the sync it done. If not, then readjust which cylinder that may be out rev the engine again and check them again. Then all you need to do is adjust the idle and adjust the linkage to fit and reconnect. Again this is the way that I do it and it works for me.
Remember the more worn the carburetors are the harder they are to get to sync. If the carburetors are new or rebuilt with new parts. It will take less that 5 minutes to sync. Also once adjusted they will last for thousands of mile. In the last 10 years I have only adjusted my idle once. This was because my State went to 10% alcohol and my idle dropped.
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