If you notice a lack of acceleration or some bogging when trying to accelerate, then your carbs are probably out of sync. Carb syncing is also necessary after a valve adjustment(which should be done every 6,000 miles as necessary).
It's a fairly easy thing to do also.
The first thing you need to do is make your own carb sync tool. You can do this for about $5-$10 depending on what you use.
Materials you'll need:
1. 2 glass snapple bottles
2. About 10 feet of clear hose. Can be found at your local hardware store. You'll need hose with 3/8 outer diameter and a 1/4 inside diameter
3. Rubber stoppers, found in the "hard to find" section at Lowe's
4. About 8oz of motor oil or you can use water with food coloring
The first step in making the sync tool should be to drill through the rubber stoppers. You need to drill two holes side by side with a 3/8 drill bit.
Next, cut about 2 feet of the hose off and pull it through one hole on each rubber stopper. There should be about 6 inches of hose coming through each stopper
Then, take the rest of the hose and cut it in half. Put one end of each hose through the stopper just enough to get through.
It should look something like this at this point:
Now take each snapple bottle and fill it with about 2in or 4oz of oil. Place a stopper into each bottle. You should have this now, except the oil levels should be even
Now, you need to get to your carbs. Usually this involves at least removing the gas tank, and whatever fairings are necessary to do so.
Now that you've gotten to the carbs, remove each vacuum nozzle tube
Hook up each clear hose to the vacuum nozzle.
Now start your bike.
If your carbs are out of sync, then you will have oil traveling from one to the other through the short hose. If your carbs are synced then no oil should be traveling moving through the short tube at all
To sync them, you'll need either a short, stubby screwdriver or a really long screwdriver. Slightly turn the yellow adjustment screw (be sure not to push down, which accelerates the bike and uses all the gas in the carbs). A slight turn makes a big difference.
Once all the oil has stopped moving within the short tube, you're done!
It's a lot less complicated than it may sound by the title
as you can see, mine were pretty out of sync
All you are technically doing is equaling/syncing the vacuum suction in each carburetor so that each one gets an equal amount of gas. As you may have guessed, the long hoses connected to the nozzles create suction within the bottles. If one is sucking more than the other, then it sucks oil from the other through the small hose. Pretty cool, right?
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