Carburetor synchronization tuning

discussion about the 750 Sport and '89/'90 900SS, which share many mechanicals with the Paso series
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q10115
Posts: 18
Joined: Mon Aug 26, 2019 4:29 pm
model: 750 Sport
year: 1990
Location: USA

Carburetor synchronization tuning

Post by q10115 »

What RPM do you folks generally synch the carbs at? Idle? 3,000 RPM? 5,000 RPM? I feel a bit of a buzz at the higher RPMs and want to know if throttle balancing could smooth it out.

Thanks,
Roger
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Frank.61
Posts: 261
Joined: Fri Jul 24, 2015 11:21 am
model: 750 Paso
year: 1989
Location: Belgium

Re: Carburetor synchronization tuning

Post by Frank.61 »

Hi Roger,

Stationairy/idle, it should run as slow as possible (you want to make sure they open the butterfly valves the same amount, hence: synchronisation).
The engine needs to run just on the idle jets!
Make sure everything else like valve play, new air filter, ignition timing or new spark plugs etc. have been taken care of in advance (synchronizing ist always the very last thing in tuning/adjusting after maintenance).

Buzz at higher rpm is most likely something else.

Good luck!

Frank
Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010
User avatar
Frank.61
Posts: 261
Joined: Fri Jul 24, 2015 11:21 am
model: 750 Paso
year: 1989
Location: Belgium

Re: Carburetor synchronization tuning

Post by Frank.61 »

guys,

Before anyone is bothered: this is the short version.
Synchronization, the how, in practice depends on carburettor/injection construction and the number of cylinders.
In short, it boils down to the fine adjustment either on the throttle valve adjustment (mechanical) or also via the idle mixture jets (e.g. at the Weber where the butterfly valves are fixed on one shaft).
just for the record ....

Frank
Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010
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