SOURCE: Cleaning Carb Jets
not to a trained ear also go by rpm and spark plug color
NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate
better use a manometer for adjusting screws
depends on condition of org parts
worn = richer running
new = lean an clean
also if changed the exhaust system need to
re-calibrate carbs for max performance
SOURCE: Gas coming out yz 125 airway next to float bowl
By spraying it you may have inadvertently blown dirt or grime even further into the carb. It doesn't take much to cause the float to stick open. This would result in a constant flow of fuel into the bowl. Once filled it will escape via the overflow.
The best way to clean the carb is to remove it from the motor, disassemble it and clean it using a small brush. If you have never done this before just take you time and make sure you have a clean work space to do this in. There are really very few parts to this type of carburetor and once you have done it a couple time you can take it apart clean it and have it back on in under an hour.
Hope this helps.
SOURCE: I have a 2000 Yamaha WR400F with a Keihin carb. It
I have recently had the same problem with my xr250r and have come to the conclusion that gas does eventually turn bad but gas with ethenal in it "goes bad qucker" I am now draining my tank and float when i park it and have not had a problem since!
Please vote if this helps
SOURCE: Hi, I just bought a stock
Piston rings may be sticking after sitting for so long. It may serve you well to remove the top end, paying special attention to the timing alignment as you do. Visually inspect the piston and rings. ensure the rings can move freely in their grooves. Look at the piston for signs of blow-by. A burned up surface of the piston that extends past the rings onto the skirts. You may simply re-ring this machine and it would solve your problem if you view these problems.
SOURCE: I cleaned the carbs it
Sounds like you need to check the needle and seat for dirt etc. or one of your floats may be sticking. A simple way to check is to connect the fuel pipe to carbs upside down with float bowl off and you will see if it is leaking or not. If that is ok then make sure that the floats are not sticking or holed. Test again by inverting the carbs again with no fuel in them and you should not be able to blow into the chamber until you turn the carbs to normal position. Hope that helps.
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