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Display Mesage #94319

Carb balancing - how hard is it?
Written by skyeenter on 6/21/2010 at 04:47 pm

Dork, here are the steps I do:

Ride bike for 20 minutes or let idle until fan comes on and goes through a
complete cycle of on/off.

Lid/Vent covers - remove screw holding side cover on, careful this screw is
threaded in fairing plastic not metal.
Side covers - put some silicone grease on the rubber grommets when reinstalling
Steering head meter panel covers - silicone the rubber grommets
Shelter - you might have to remove the seat if the shelter is tight
Air Cleaner Box

Long blade 9" phillips screwdriver
Short phillips screwdriver for tight areas if carb bands are on backwards.
Rubber tubing 6" - 10" long - this is a right front carb mod for synchronizing
unit hose attachment.
Some type of hose clamp for the open vacuum hose. I use a hemostat or just plug
it with a screw or bolt.
Parts diagram to identify tube connections on carb.
Flashlight/trouble light

Once carbs are exposed identify the tube connections. On Carburetor Assembly
parts diagram identify item #3, the tube cap. This is one of the most difficult
parts to get to without taking the carbs off. Do not lose this tube cap.
The bike will not run with this vacuum tube open. I use the hemostat clamped on
the end and a flat blade screwdriver pry to get it off. If you drop it into the
mysterious hole of no return you'll have to fashion something for replacement.

That's where the mod comes in. Get a 6" - 10" rubber hose the same size as the
ID of the tube cap and attach it to the outlet. Thread the hose around to the
rt. side of the carb where it's more accessible. Find a hard plastic tube the
same size as the ID of tube cap. (On the left side of carbs is the vacuum hose
routing from the petcock to the carbs. There is a black plastic T connecting
the three hoses. You want something like that.) Tag this hose with something
indicating that you have lengthen this hose for easier carb synching. So the
next guy knows what it's for.

Insert your plastic connector into rubber tube. Connect your synchro line to
the plastic connector.

On the left side, at the already mentioned black plastic T remove one of the
lines and connect your other synchro line. Clamp/plug the open vacuum line.

Identify adjusting screw location between carbs. If you want, if carbs are
really out of synch, adjust screw by eyeballing to 50% equalizing of carbs.
This gets you in ballpark range and can be used as a short term fix if in an
emergency or do not have a carb synch unit. Once you get to just about even you
can do a lot of synching just by ear.

Reinstall air cleaner box. Make sure the two fingers on the tube that protrude
over the throat of the carb are visible and fit over the guide. They sometimes
hang up in the throat and can get pinched off if treated badly. Reseat and
tighten the bands.

Start your engine and let it warm to idle again. Don't do anything in the
process until it's properly warmed. Adjust idle to 1200 - 1300 rpms.

Shine your flashlight down the "peep" hole of air cleaner. Identify adjusting
screw. Insert screwdriver down hole and hope you find it on the first try.
Keep trying until you feel the tip snug up and become firm in both directions
and the engine sound changes slightly.

Start adjusting. You'll notice a slight drop in engine rpms when turning the
screwdriver when you put pressure on the throttle adjusters. Hence, the reason
for increasing the idle rpms.

The least painless and, what I've found that works for me is, if you stall and
kill the engine remove the synch tubing and replace the tube cap and vacuum
connections. Engine should restart easily. Increase rpms slightly to prevent
stalling again. Reinstall carb synching tubing and start over.

I try to check my synch at 3000 rpms but that can be difficult because keeping a
steady 3000 rpms is not easy.

Once it's done you will not believe the difference in performance.

Good luck. skye

--- In, "pc800dork" <dokiedo@...> wrote:
> What panels have to be removed to get to everything? Any good tutorials here?

Message Thread for message #94319