Acid overflow is caused by overheating, so there is a short someplace,disconnect the battery and neutralize the leaked acid with baking soda dissolved in water and remove the battery. (the short can even be internal, in the battery) Replace the battery with a new one,connecting a voltmeter between the negative terminal and its cable. (An ampmeter of t least 10 amps capacity would be better.) With the key off, the meter should read zero. a reading indicates a short to ground somewhere. Trace all wires, look carefully where wires go through holes or past edges for bare or burned wires. When the meter reads zero, you can turn on the ignition and gingerly touch the negative cable to the negative terminal and watch for a spark, it should be small, assuming the ignition is battery operated, not by magneto. Turn on the lights should cause a slightly larger spark. A big spark and dimming of the lights means there is still a big short you have to find. Otherwise, turn off the key , hook up the negative cable, firmly but easy to disconnect, and try the system.
SOURCE: carb issues
Sorry to hear about your carb issues. Two possible issues that come to mind are (1) fuel level in the bowl most float assemblies are made of brass and have a small tab which applies pressure on the float needle. If this tab is not adjusted correctly the fuel will not shut off when the float reaches its maximum height. The tab can be bent to apply pressure at just the right moment. You can verify this by doing a bench test, with the bowl off. So much nicer to know before going through all the work of putting it back on the bike. (2) Check the buoyancy of the float itself many of the old-school foam ones dont have enough umph to close the needle all the way. If you have the brass style floats make sure you dont have a leak. ( submerge the float then check for air bubbles also shake the float and listen for gasoline within) Check with GDL Cycles they can help you with those hard to find parts for many old school Japanese bikes.
SOURCE: gilera runner ignition
When you encounter this type of problem the best thing to do is find a fab shop that can reproduce the tube that was ripped away. I frequently did these types repairs when I was running my shop. It's not really that hard to do, you just need a lathe and some shop tools and a tig welder to fix it. If you have to pay to have it done it might cost about $100.00 plus you will need to replace the ignition that was destroyed.
I feel for you, most likely did not catch the thief either. If I still had my shop I'd fix it for free for you.
Good luck finding the fab shop you need.
SOURCE: gilera runner 50cc wont start
my gilera 50cc turns over but no petrol from carb 2 spark plug help also what is the valve on top of carb with the wire ...............
SOURCE: Gilera runner sp50 - engine turns over but does not start
i have a gilera dna 50 it was working perfect yesterday and all of a sudden its turning over it wants to start but wont ?
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