Bike standing,without staring for 3 months,skips and misses, touch top of cylinders1 &2and they are warm. the only stays on by pulling choke all the way. when bike is supposedly warm enuff return choke then it turns off.
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Open the choke by pulling the choke lever on the left
handlebar control toward you. Set the bike on its kickstand, put it in
"Neutral" and start it up. Allow the Road Star to warm up for about 10
minutes before continuing with the adjustment procedure.
Locate the idle adjustment screw on left side of the bike
just below the rider's seat. Twist the adjuster screw clockwise one full
turn. This will ensure the bike stays alive so you can adjust it to the
Close the choke lever and listen to the engine carefully.
Twist the idle adjustment screw slowly counterclockwise. You should hear
the engine speed start to slow.
Twist the idle screw counterclockwise until you hear the
engine start to sputter and die. When this happens, stop and turn the
screw one half turn clockwise. Your bike should now be idling at the
Put your bike on the center kick stand either outdoors or in
a well-ventilated garage with the door open. You'll need to run the
engine, so don't make the mistake of doing that in a closed garage.
Set up a powerful fan next to the bike to help keep the
engine cool. The cooling fins on your bike's engine rely on the apparent
wind created when the bike is in motion to keep the block from
overheating. Since you'll be standing still, you will need to keep
plenty of airflow on the engine.
Remove any body work or other obstructions so you have clean access to the back of the carburetors.
Find the ports for each carburetor on the intake track. The
port is a metal tube extending upward from the intake covered either by a
rubber nipple or a screw. Each carburetor has its own port. Remove the
plug (be it metal screw or rubber nipple).
Attach the manometer lines to each of the carburetor ports.
With the manometer face up, attach the leftmost line to the port on the
leftmost carburetor and work from left to right. Keep the lines free of
any kinks or obstructions that could interrupt the flow.
Start the bike using as little throttle as possible, and let
it idle until the engine is warm. Don't forget to turn on the fan to
keep the engine from getting too warm.
Locate the vacuum adjustment screws along the top of the row
of carburetors on the shared throttle arm. If you need help figuring
out what the arm looks like, twist the throttle hand grip slightly and
you will see the arm move back and forth. A standard, four-cylinder bike
will have three adjustment screws along the throttle arm.
Read the manometer for carburetors one and two (beginning
from the left). Turn the leftmost adjustment screw to bring the vacuum
readings for those two carburetors equal to each other. Turn the screw
clockwise slightly and back again to get a sense of the effect on your
readings. Do the same for carbs three and four using the rightmost
adjustment screw. When your settings are balanced for each pair, use the
adjustment screw in the center to bring the two pairs into balance with
Adjust the idle (fuel mixture) screw to set the appropriate
idle speed. You can call your local shop to ask about the proper setting
or check the service manual for your bike if you have it. Make sure you
are using the warm idle recommendation as, at this point, your bike is
at full running temperature.
Tweak your vacuum settings if the idle adjustment threw them
off slightly. Keep working back and forth from the carburetor
adjustment screws to the idle adjustment screws until you have an equal
vacuum for the four carbs and your idle is smooth and running at the
Turn off the engine and remove the manometer lines. Do not
forget to replace the vacuum plugs in the carburetor ports to seal the
air intake and preserve the balance of your newly tuned carburetors.
If the carb is adjusted correctly, the engine will not idle without the choke when cold. I will usually take at least 3 to 5 miles of riding to get the engine warm enough to idle by itself without the choke. If your bike is a full operating temperature, it should idle at about 1000 RPM. If it's idling higher than this, you need to slow it down a bit.
Remove the air filter cover and look at the top right side of the carb. You'll see a screw there . This is the throttle stop screw. Turn the screw counterclockwise to lower the idle speed to 1000 RPM or so. Blip the throttle and let it settle back to idle. Reset it if necessary. Once set, put the air cleaner cover hand on.
Has this 6 year old machine ever had a top-end job done? If not, then you may want to consider it. You can just replace the rings but I'd at least pull the cylinder apart and check for blow-by or a stuck ring. if your rings don't rotate freely in their channels, then it's time to replace them. If your cylinder has a glassy look to the inside walls, then it needs a hone job at a minimum. Kustom-kraft.com is an excellent choice for top-end service.. Bikebandit.com is THE place for parts.
You should be able to adjust the choke to where it will stay in without holding it by turning the rubber piece behind the choke clockwise towards you until the choke stays out on its own. You can adjust this so the choke automatically adjust as the bike warms.
Hope this helps..
ya i have a yz250f and learned from a first hand experience that any racebike 2 stroke or 4 stroke doesnt like to idle for a few minutes without moviing. i started up my bike and let it sit for 8 minutes to warm up and antifreeze started spewing out. so i cut it off and called a friend that races. he told me these bikes need air moving through them otherwise they overheat easily and the antifreeze over flows because it expands. if i actually read the manual the book says not to let the bike stand and idle for more then 3 minutes cause after that amount of time it should already be warmed up. so its just the bike over heating and make sure to top off your coolant the next time u ride
Engine management light was on permernantly after replacing battery, took advice and let bike idle until thermo fan started, turned bike off and let thermo fan stop, restarted bike and engine management light went off. this proceedure resets engine management system. GREAT ADVICE thanks.