1973 Honda CB500 Carburetor Rebuild


| 5/16/2012 2:44:00 PM


Tags: how to, classic japanese motorcycles,

1973 Honda CB500 carburetor 

We’ve previously shown you how to rebuild the forks on a 1973 Honda CB500. This time we’ll show you a carburetor rebuild. While our step-by-step should make the process pretty clear, we highly suggest a good Chilton or Haynes shop manual to help sort out the many details in removing and installing the carbs. A picture, as they say, is worth a thousand words.

Detach the throttle and choke cables, loosen the clamps on the insulators between the carbs/engine and the air cleaner bellows. Remove the carburetor assembly from the engine 

Detach the throttle and choke cables, loosen the clamps on the insulators between the carbs/engine and the air cleaner bellows. Remove the carburetor assembly from the engine. A manual helps here.

Turn the assembly over so you can see how the carbs mount to the throttle assembly plate. 

Turn the assembly over so you can see how the carbs mount to the throttle assembly plate. Number them one through four so that they go back on the throttle assembly plate in the same order.

robert
3/4/2014 6:01:44 AM

The other critical items not addressed are worn throttle slides and barrels. These are the major causes of idling issues and overheating due to overly lean fuel/air mixtures. If you find the exhaust headers blueing instead of being of a mild straw colour then, indeed, this worn throttle body is where you gonna need to pay attention. But, when reassembling, also note the condition of the rubber tubes connecting these throttle bodies to the cylinder head. Old rubber don't flex sufficiently to provide a perfect seal. Obviously the throttle cables too should also be adjusted to operate all the slides exactly in concert. Insure that y'all valve clearances are in good order and the ignition timing is spot-on before adjusting the individual idling settings. Now, you good to go...


dm500k0
2/21/2014 10:28:44 PM

This is a nice guide but omits one critical component, the emusion tube, which sits above the main jet in the central tower. This piece is not included in rebuild kits so it must be removed, thoroughly cleaned, and replaced during rebuild. Many owners are not aware of this step and find that their bikes still run poorly even after a carb clean/overhaul. For details on the procedure google sohc4 emulsion tube.


hector
11/13/2012 1:03:35 AM

i just want to thank you for taking the time to post this up. i just got my first bike (1972 cb500f) and had no clue as to how to rebuild a carburator. stumbled upon your page and was able to (while referring back to it hundreds of times it seems) successfully disassemble, clean, reassemble and put it back on the bike. couldnt have done without your guide. thanks!





bike on highway

Classic Motorcycle Touring and Events.


The latest classic motorcycle events and tours.

LEARN MORE