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Thanks! I really appreciate the information.

Update: After synchronising the carbs the engine runs on all four cylinders without major hickups. Though, I still experience some random RPM peaks in idle position. I assume this could be due to a float or float needle valve issue. I will replace all float needle valves and seats with a new...

And this is what amc49 wrote:

Initially, I placed my question in a wrong section (under DOHC). Here is what Chris wrote:

Hello everybody, Please assist a newbie from Copenhagen, Denmark. I'm the happy new owner of a partly unrestored CB750 Four K2 which has been off the road for at least 10 years. 27.000 km according to the gauge. Most soft/rubber parts, including carburetor manifolds, O-rings, fuel hoses...