Many thanks to "Thor"
|This is how to change your jet and needle, for an
explanation of how your
Carburetor works. Stargazer has a great article by the Mucker at his site
The jetting is not terribly complicated if you remember a
Do not disconnect the throttle Position sensor from the Carburetor.
Remove the nut that holds the choke cable on the left side, and remove the cable from the bracket.
Remove the idle adjusting cable from its bracket.
Disconnect the gas line at the carburetor.
Completely loosen the throttle cables.
Unplug the two electric leads to the carburetor heater on the bottom of the carb.
Now loosen up the clamp that holds the carb in the rubber boot.
With a pull and wiggle motion the carb will come out of the boot.
Tilt it slightly to the left and remove the throttle cables. The cables align with a groove and slide out.
Keep a rag under the carb as gas will come out when you rotate it.
With the cables now off, rotate the carb to the right until it is upside down.
You have to loosen the brass carburetor heater to remove the
bowl. Caution, when you tighten the heater back up, be very careful
You have to remove the four screws from the bowl to remove it. They are soft headed screws and strip quite easily.
I used a good set of needle nose vise grips to break the tightness
of the screws.
Remove the screws.
When removing the bowl lift it straight up and be careful not to hit the floats.
Click on image you want to enlarge
Under the bowl you'll see several jets.
The one you are replacing is the jet that sits on a brass spacer.
It should have the number 165 on it.
Remove the jet with a flat blade screw driver and put in your new main jet.
Replace the float bowl being careful not to hit the floats.
Use the Barons allen head screws to secure the bowl.
Tighten the Heater back up.....
Now you have to remove the brass plug from the Pilot mixture
This is a tubular housing that rises from behind the bowl in
The Baron gives you a drill bit to drill the hole larger.
Use the metal screw the Baron gave you to screw into the brass plug.
Use a set of vise grips to grab the screw and wiggle the plug out.
You will see a small flat head screw inside.
With the carb upside down, tighten the screw clockwise until it lightly seats.
Now back the screw out three and one half turns.
Now put the carb back into the boot, placing the throttle cables
in place before you insert it into the rubber boot.
Now remove the two screws that hold the black plastic cap on
Remove the cap and remove the long spring. The slide is connected
to the rubber diaphragm.
With the slide removed, look inside the slide. You'll see a plastic
Push the needle up and grab the end. When you have a hold of the needle, turn the slide upside down and finish removing it so the washer and spacer don't fall off the end.
Now take your new needle and place the clip on the indicated groove the Baron has recommended.
Always count down from the top.
Place the white plastic spacer under the clip from the stock needle.
use the washer under the spacer as was on the stock needle.
Put a washer on the top of the clip. Now insert it back into the slide and press the plastic tab with the spring back in.
Make sure the rubber diaphragm is seated properly with the O ring towards the rear.
Put the slide spring back in and replace the cap and tighten the screws.
Connect the two electrical leads to the heater,
Your finished with the carb.