125-200cc pre mix problem

I have just dug my wre 125 out the shed which I dumped in there because of an electrical problem 6 months ago. I fitted a new stator and flywheel and I had a nice bright spark so problem fixed and it kicked up on the fourth kick it was smokey as hell but running. The bike is running pre mix but I forgot to drain the carb when I last put the bike away so I drained the carb and the petrol that came out was green but the premix in the tank is still a nice red colour. The problem I have now is it keeps fowling the plug with green oiley petrol so Im going to clean the carb out tomorrow, do you think the premix thats still in the tank would still be ok to use thanks

I,ve just ordered up a couple of new plugs and I'll get new fuel tomorrow. How long can you you keep pre mix for before it goes bad thanks.

With fuel stabilizer added I can use premix up to a year. Without it the fuel goes really bad after 3 months. Cam.

The green color is likely ethanol seperating from the gas,i had that problem with my carb after not riding for 6 months had to tear the whole carb apart and clean it,,a tip i always turn the fuel off about a 1/4 mile from the truck so the bowl will be empty when you transport!!

I used to do a similer thing I would just turn the tap off and then the bike idle until it ran out. I did not do it this time as I think I was just sick of messing with it and threw it the shed

Yup understood,,if you make it a habit then its easier to diag a problem...

oil contaminates the fuel, so even if you use stabilizer it is better to use the fuel in something less expensive such as a weed whacker
oh and the fuel also breaks the oil down in time, one month and the fuel is dead in my book

I just checked my last post on here from when I was aking for advice on the electrical problem and that was november 2012 so that pre mix has been in the bike for 8 months.

Noooooooo...Take the carb apart and clean..

I like to use Berrymans carb clean its the best cleaner period,,blow every hole out with compressed air,it'll be good as new!!!

I cleaned the carb out , put a brand new spark plug in and fresh pre mix and on the first kick it fired up then died so I took the plug out and it had fouled the plug with the same green oily fuel and it was also dripping from the exhaust. The next thing I tried was take the carb out and cleaned it through again then I took the exhaust off and wiped off the exhaust port and then I left the plug out and pushed the kickstart down slowley and looked in the cylinder and the piston and cylinder was coated in the green oily fuel so I left the bike sitting for an hour with no plug, carb or exhaust then put it back together this time it fired up first kick then died after ten seconds again with a fouled oily green plug.

What kind of oil and are your ratio's rite,,also did you ever mess with jetting or is it all stock.

be patient the crank area has this goo in it
snowmobiles have a drain too bad these dont

Its got standard jetting and has always run fine on pre mix 125ml stroke to 5 litres of fuel.

Would it be worth taking the cylinder off and having a look.

I really think you have a plugged passage in the carb circuit because of the fuel sitting for so long,,if you can get a carb from a friend and it runs problem solved,,like i said too my bike sat for 6 months with old fuel in it wouldn't start took the carb off found most of the circuits plugged solid,,get a good carb cleaner like Berrymans preferably one that has a basket/tub so you can leave the carb body in the cleaner for awhile to desolve all the crud,and blow all the passages out good,,tip make sure your floats not leaking..

I wonder if you had a leaky needle and seat, and your carb leaked a bunch of gas down into the crankcase. The gas would evaporate, leave the oil behind and cause the problems you're talking about. Despite people thinking so, gas will not go bad to the point that it will cause a problem in 6 or 8 months.