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Re: I have a 44mm mikuni carb. it gets fuel to the carb...
A couple of possibilities-
- Float is corroded and not floating
- Valve either gummed up or worn and stuck
- Float level not properly set
Typical float valves Typical floats
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Have you checked your valve timing as it sounds like you are putting back pressure in to your inlet valves forcing the fuel through the carb and out the overflow
standard carbys will cover a .020 oversize bore
melted piston is from detonation which is lean mixture or incorrect ignition timing
the oil will be a metered amount so it will be correct for all rpm
items like incorrect float level and air filter are the suspect causes
Carb's can be cleaned, hope you didn't throw money away on a new one for dirt.
You may have dirt in the gas tank getting to the carb. If you can, remove the bowl drain, (At the bottom) and see if there is sediment in it.(dirt)
You will have to adjust the float pin of tht particular carb and don't remove them off the rack..just pull them out of the engine and work on the one tht needs attention.
Hope this helps!
your carb. is flooding the cylinder when its not running.it will cause ring damage.turn your gas pitcock off when not in use.get carb cleaned &adjusted.
also check the float level, if not set to the right height float will cause too much gas to be sent to the bowl. you do this by bending the small tab on the back of the float. one way makes the float shut off sooner and the other makes it shut off fuel later. also check the fuel air mixture no small task on the mikuni carb.
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