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if no prime position on fuel tap then have to undo fuel tap, whats in tank. if diesol empty most out then fill with petrol diluting by mass amount will be ok. may need to empty carb drain screw at bottom maybe need to clean plug
carb will need cleaning as it sounds like you've got a stuck float valve...it only leaks when you try to start it as the fuel tap only flows when the engine is turning over. When leaving a bike stood for a while with an empty tank you should put an oily rag into it to prevent rusting...although the correct method is to fill the tank right to the top and add fuel stabiliser.
the absolute best way is the smalls nuts and bolts. make sure the tank is completly dried out. wait a day for it to air out if need be. take off anything going into the tank. get the smallest ones you can find and if you can get the tank about 1/8th to 1/4 full of the things it will be best. it will not damage the tank and it will get every thing out. find two trees kinda close together and tie up the tank kinda loosely to where you can move the tank about 3 feet top to bottom and side to side. you are going to need to shake the tank for a good half hour non stop. your going to get tired and you can stop to rest but keep at it. the longer the better. empty the tank. if you have one of those magnetic reacher flexible things it is going to come in really handy. get every thing out. blow out the tank then reinstall.
you will need to remove ur seat in order to get to the bolt or clip down that holds the rear of the petrol tank to frame.make sure the fuel tap is off & remove the fuel line going from tank to carburator then remove tank & empty the old gas out.there should also be a drain bung/bolt on bottom of ur carburator bowl,undo this let all gas empty out,then re-tighten & then reverse steps to put tank back on.Fill with fresh gas try start,check for any leaks & should be good to go!
Sounds like the bike sat for a while. Condensation, water built up in the tank. Pull tank, empty out gas. If you can't do that, put in some dry gas. Pulling the tank is not that hard to do, and it the best way. Check the fuel lines, blow them out. Use fuel stabilizer if your putting the bike up for an extended period of time.
Drain the tank of the old fuel completely, try to drain the fuel lines as best you can. Whilst the tank is empty, if you can remove the fuel pump and clean out the filter for debris or gunk. Pull out the spark plugs and see if they have fouled, don't try cleaning them just replace. I have found once a plug is fouled, it is best to just bite the bullit and buy new ones as issues can happen again.