1972 Honda CB750 carburetor synchronization

Learn how to sync carbs on a classic 1972 Honda CB750 for optimal performance. In this step by step guide we demo how to use carb sync gauges to insure all four throttle bodies lift at the exact same moment. Proper synchronization ensures that when you twist the throttle, all that power feeds into the engine at the exact same time, delivering smooth operation and unbeatable off-the-line performance.
In this video, you’ll learn:
•How to attach carb sync gauges to the manifold inlet ports.
•How to adjust the throttle body lift to align all four gauge needles.
•Tips for fine-tuning your carbs for peak performance.
Proper carb sync is crucial for classic motorcycles, especially iconic models like the Honda CB750. If you’re restoring or maintaining your classic ride, this video is for you.
Tools used in this video:
•Carburetor synchronization gauges.
•Screwdriver and basic tools.
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Time Stamps
00:35 - Introduction, Gauge placement and overview.
01:10 - Manifold vacuum port locations.
02:05 - Attaching gauges to manifold inlets.
03:03 - Trick for putting manifold plugs back in.
03:56 - Start-up expectations.
05:45 - Stabilizing #3 gauge.
06:09 - First look at all four gauges following warm-up.
06:52 - Loosen throttle body lock nuts.
07:32 - How to make the adjustment.
07:47 - Where the needles should point.
08:00 - Adjusting # 4.
09:14 - Making # 1 and # 2 equal.
10:54 - Let sliders snap back.
11:20 - Tighten lock nuts.
12:40 - Final look at gauge alignment.