For a Bosch 009, you will want to set timing to 30 degrees BTDC at 3,000 RPMs. If your 1971 VW Bus or 1971-74 VW Beetle/Ghia/Thing has the. ![]() Maximum advance, at 3,500+ RPM, vacuum hose connected, with no load on engine (car sitting still), light throttle, should not exceed 42-44° BTDC. Timing should be set initially at 30-32° BTDC at 3,500+ RPM, vacuum hose disconnected and plugged. We first set the idle mixture screws to the best lean idle by turning the mixture screws in until the engine starts to stumble. The tuning can be done, and some people prefer, tuning by ear while listening for the RPM change. With our timing light, it's very easy to see the adjustments at the carburetor effect the RPM of the engine. Use a timing light with vacuum advance disconnected. ![]()
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