Topic: CB650 Carb question

[1979CB650_Chris]

Ok, im going to try to describe this the best I can so here goes.

On the airbox side of the carbs are 4 little brass nozzles that stick up (1 per carb).  I have no idea what these do.  They stick up and they have no holes except for the number 1 carb, that carbs brass nozzle thing does have a hole in it.  To make matters even more confusing, I was at a motorcycle repair shop the other day and saw a set of 650 carbs sitting on the shelf.  After close inspection of these carbs none of the brass nozzles had a hole in them, including number 1.  So I am very confused as to what these do.

On another note when I was cleaning the carbs the number 1 brass nozzle fell into its fitting.  It will move back up to where it should be but wont stay.  I have not noticed a performance difference but im sure that this can not be good.

Thanks for the help... Chris

[scunny]

not much help but my early CB650 carbs have same brass**posts** no holes. my CV carbs have same. Damn I need a manual.

[eurban]

Brass "posts" are the nozzles for the acelerator pump.  #2 carb has the pump on its bowl and there are rubber hoses interconnecting the nozzles.  These nozzles should squirt a stream of fuel down the carbs throat when you quickly whack open the carbs.  The holes are on the engine side of the nozzles. The acelerator pump is pretty important for proper performance but the bike will run without it. I have never has one of the nozzles pop out but my guess is that it is a pressure fit so try pressing it back in place.  With the air box off and with fuel in the bowls, whack open the throttle quickly and watch for the squirt of fuel.  If fuel doesn't shoot out then you have some more work to do.