Topic: CB 650 C carburetor question

[650HELPER]

I am working a CB650 C which hasn't run for a few years. Wouldn't start. Fired up for a few seconds if using ether in air intake. Pulled spark plugs, all were firing. Removed the entire carburetor assembly for cleaning. Found two of the main jets plugged, now all are clean. Squirted carburetor fluid and compressed air through the low speed jets, but since you can't remove them, I'm not sure if they are clear. When I shoot fluid or air through the jet opening, there is no apparent exit openning in the main barrel of the carburetor. Could somebody tell me how to tell if these jets are working correctly? Or how to make sure they are clean and clear?

Thanks, Ron

[cb650]

Year?    650's used 2 completely diffrent sets of carbs.  79/80 slide type  81/82 cv's.





                          Terry

[650HELPER]

1980 Slide type

[cb650]

The idle jets will come out if your carefull.    I used a vise grip with no more pressure than it took to twist them out.    Also FYI I cleaned a set of these carbs several times and couldnt get it to run right .  cleaned up a set of junkers I had and it runs great. 




                                   Terry

[Soos]

I would second the pulling them out.
Just twist and pull, don't rock them back and forth.
The carb castings are weak metal.


Another alternative is to use a set of cb750 carbs(69-76).
I finally decided thats the route I wanted to go with my '79cb650.

Adjustable needle, screw in slow jet, main jet changes WITHOUT removing the carbs 

l8r

[Ibsen]

If you can't clean them properly with a carb cleaner and compressed air they probably needs to be ultrasonic cleaned. Sometimes that is the only way to clean out all the passages inside the carbs. There is no guarantee this will solve your problem, but in most cases it does.