2003 vstar 650 carb sync procedure

[best...@gmail.com]

Hello everyone. I just tried to check the carb sync on my wife's 2003
VSTAR 650 when I hooked up the carbtune stix to it was way off.
one of the carbs was near the top of the carbtune and the other almost
at the bottom hardly moving at all. How do I get them to be equal?
I thought I read somewhere you adjust the screw in the middle of the
carbs
this didn't do anything to the levels. when I tried to remove the
vacuum hoses
from the front carb the bike still ran with it off but when I tried to
remove the back
hose the bike died right away. which is what I believe it should do.
everything on
the bike is stock nothing has been changed. the bike has 10,000 miles
nothing
has been done that I know of to it other than oil and filter changes.
plugs are white.
any help would be greatly appreciated. Thanks Bob

[jubalon via MotorcycleKB.com]

best...@gmail.com wrote:

>VSTAR 650 when I hooked up the carbtune stix to it was way off.
>one of the carbs was near the top of the carbtune and the other almost
>at the bottom hardly moving at all. How do I get them to be equal?

Your bike is hardly broken in at 10K miles. If nobody has ever messed
around with the carbs, they should stay synchronized forever because
there is very little wear on the moving parts.

Before I would try to adjust the throttle butterflies, I would run some clear

carburetor through a full tank of gasoline. 4 or 5 ounces of Berryman B12
or GumOut or STP carb cleaner will do wonders for cleaning out the
passages and ports and jets.

>I thought I read somewhere you adjust the screw in the middle of the
>carbs

http://webservices.motorsportdealers.com/parts/partImages/YAM/2/02/0494/0008.Gif

#1 is the front carb

#2 is the rear carb

#4 adjusts the idle speed for the front carb. The front carb is the master
carb. Adjust
the idle speed with the knob and then get the rear carb's vacuum to match the
front
carb's vacuum. If the idle speed is too fast or too slow, you can turn the
idle knob up or
down.

#40 adjusts the idle speed for the rear carb

>plugs are white.

The EPA mandated really lean idle mixture to pass the emissions
requirement, and when you're cruising on the highway, you're only
using about 1/8 to 1/4 throttle, so you're still running on the idle jets,
not the main jets.

Look deep into the spark plugs, down where the porcelin insulator
meets the steel body. If there's a thin ring of black soot, your plugs
are burning just fine.

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