Carburetor Synchronization Tool Kit | Honda CB360 / CL360 / CJ360

Description

Honda CB360 / CL360 / CJ360 Carburetor Synchronization Tool Kit

Everything you need to synchronize the twin Keihin CV carburetors on your Honda CB360, CL360, or CJ360 in one kit. Carburetor synchronization balances vacuum between both cylinders so the engine idles smoothly, accelerates cleanly, and delivers full power. This kit uses a single-gauge method with a gang valve to read one cylinder at a time, giving you a more accurate comparison than a dual-gauge setup where the gauges may not read identically.

Why You Need This

If your CB360 / CL360 / CJ360 has any of these symptoms, the carburetors likely need synchronization:

• High or erratic idle speed
• Inconsistent idle that won’t settle
• Shaking or vibration while accelerating
• Mediocre throttle response or lack of top-end power

Most Honda 360s have not had their carburetors synchronized since they left the factory in the 1970s. A proper vacuum sync is one of the most effective tune-up steps you can perform on these bikes.

Specifications

Important Notes

• Prerequisites: Synchronization should only be performed after the cam chain and valves have been adjusted, ignition timing is set, and carburetors are clean with air filters in place.
• No air leaks: The carbs must have no air leaks from the diaphragms, intake manifolds, or throttle shaft ends. Air leaks cause false vacuum readings and make an accurate sync impossible.
• Engine temperature: The bike must be warmed up to operating temperature (about 10 minutes of riding) before synchronizing. Carburetor adjustment should only be made when the engine is at operating temperature.
• Keep it cool: Use a box fan pointed at the engine during the process to prevent overheating while the bike is stationary.

Kit Contents

• Sync Wrench (8mm socket with flat head driver)
• Vacuum Gauge
• Gang Valve (2-way, for switching between cylinders)
• Dampening Inline Valve (steadies the gauge needle)
• Carburetor Vacuum Port Nipples × 2 (brass, 360-specific)
• 5.5mm Fuel Line — 3 feet, with splice adapters × 2
• Vacuum Line — 5 feet
• Zip-ties × 8

How to Synchronize Your CB360 / CL360 / CJ360 Carburetors