pilot jet

[dynoman]

need confirmation...I believe the pilot jet is a fuel screw....right or wrong?>
thanks to anyone responding
chuck

[Kai Ju]

The pilot jet and the fuel screw work together but are not one and the same.
The pilot jet has a a fixed opening that flows a predetermined amount of fuel.
The pilot fuel screw is adjustable to allow fine tuning of the amount of fuel, supplied by the pilot jet,  that enters the throttle bore.

[dynoman]

O.o.... I thought ppl would read and understand my question... so will reword my question about the "IDLE MIXTURE"... CB1  carb, is it a PILOT AIR SCREW or a PILOT FUEL SCREW?
thanks

[Kai Ju]

You did say "...I believe the pilot jet is a fuel screw....right or wrong?>

To clarify, the low speed mixture screw is a Fuel Screw.
Here is an easy way to determine whether a carb has an air or fuel screw:
If the low speed mixture screw is on the airbox side of the carb it controls airflow, ergo it's an air screw. The further you turn it out, the leaner the mixture gets.
If the screw is on the engine side of the carb it's a fuel screw. The further you turn it out the richer the mixture gets.

'nuff said.

[chitor]

You did say "...I believe the pilot jet is a fuel screw....right or wrong?>

To clarify, the low speed mixture screw is a Fuel Screw.
Here is an easy way to determine whether a carb has an air or fuel screw:
If the low speed mixture screw is on the airbox side of the carb it controls airflow, ergo it's an air screw. The further you turn it out, the leaner the mixture gets.
If the screw is on the engine side of the carb it's a fuel screw. The further you turn it out the richer the mixture gets.

'nuff said.

Sorry for my ignorance,  but in our CB1 what side are the mixture screws?  Is it an air or fuel screw?  I want to richen up the adjustment.

Thanks.

[xstreamcanadian]

two available on each side, (one per carb) go easy as they break easily.

[chitor]

two available on each side, (one per carb) go easy as they break easily.

Thanks.  But how can I make the mixture richer?  clockwise or counter-clockwise?

[xstreamcanadian]

my guess is that when you unscrew it, it takes up less volume, and allows room for more fuel. but truly this isnt helpful as i have no real idea

[91cb-1]

You should check it out on youtube, type in carb screw rich misture or something it doesn't have to be on the cb-1. keep in mind all carbs follow the same design, watch what you learn from the you tube video and then apply it to the cb-1 carbs. that's how i learned to ballance my carbs

[clarkdw]

I read the Common Service Manual and the way it describes the adjustment of the Pilot Screw indicates that counterclockwise richens. In other words, it is a fuel metering needle jet.

If it were an  air metering needle jet as is used in some two stroke carbs then Honda calls it an Air Screw and the adjustment is reversed.

The specific reference is page 8-23 of the CSM where the setting of the limiter caps is discussed. The CSM gives very specific instructions for setting the Pilot Screws.

[xstreamcanadian]

hey clark

is there a link to that csm around still? I have the bike specific one in hard copy, but would love to go through that section you specify.

thanks in advance. you could email it to me if you want that would be good too. my email is my user name at hotmail dot com.

[clarkdw]

Go here:

http://www.vf750fd.com/vf750f/Honda_Common_Service_Manual.pdf

or here:

http://xr650r.barbershack.com/XR650R/Honda_Common_Service_Manual.pdf

or here:  

http://www.hondaxl.it/download/Manutenzione_Honda/Service_Manual_cap_01.pdf

or here:  

http://www.carlsalter.com/aaman/Honda_Common_Service_Manual.pdf

[xstreamcanadian]

thanks