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It does not close the fuel intake in the carb, it is the valve with rubber on top of valve, this valve is attach to float. When this rubber is dirty or worn it doesn't close the fuel when the float is at max, so the fuel goes out through upper rubber pipe.
Unscrew speedometer cable bolt and take the cable out, unscrew 2 bolts on the cylinder cover front and rear cyl., before take of the tank, drain coolant at the water pump, unscrew 2 bolts from water pipe near both cylinder cover and take the 12cm pipe out (there is a rubber water pipe on this metal pipe) This way you can take of the covers, just take some time.
The fuel filter is in the tank on the petcock and is self cleaning. I suspect you have bad spark plug caps on your bike the cap is part of the wire. If you remove the wire and take a reading with an ohm meter, the cap should read 5000 ohms . Anything above or below and you should replace the cap. This is probably causing the slight miss.
If you don't have a service manual, really consider getting one for your aging bike. Look up Clymer manuals or buy one from Honda. Meantime, check the 646 help section in reference at the library.
Hi, Your valve clearances should be: Intake .08-.12 mm (.003-.005 in) Exhaust .12-.16 mm (.005-.006 in) I usually start all gaps in the middle of given specs, then fine tune from there. Hope this helps
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