thesloth Posted June 25, 2015 Share Posted June 25, 2015 Hi everyone. New to the forum and relatively new to 2 wheels, and really enjoying it!I have an Aprilia SR 50 moped which a friend had sat in his garage for a while.After replacing parts ( HT coil and lead. spark plug, draining fuel and oil and refilling) I come to start it up.The battery is fully charged and turning the engine over with ease for about 2 cycles, at which point it seems to create too much pressure and not continue turning.I have removed the spark plug and the engine will turn over smoothly (both kick and electric) with no abnormal sounds. however, the oil and fuel mixture seems to be spurting out the top.I have checked the spark plug and ht lead, both work perfectly.I hope I've supplied enough information, if not just ask for more details and what you'd like to know about and I will do my best.I appreciate ANY help anyone can give me!Thanks guys Quote Link to comment Share on other sites More sharing options...
Tango Posted June 25, 2015 Share Posted June 25, 2015 Sounds like a carb problem......you shouldn't be getting fuel/oil mix spurting out the plug hole......sounds like a carb strip and clean could be in order...... Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 25, 2015 Share Posted June 25, 2015 sound like the engine is full of fuel and causing vapour lock might need to remove exhaust and keep turning engine over by hand/foot to clear it out Quote Link to comment Share on other sites More sharing options...
Steve D Posted June 25, 2015 Share Posted June 25, 2015 Sounds like hydraulic lock. As above, plug out and keep kicking until it clears. Probably caused by a sticking float in the carb draining the tank into the engine. Don't have the ignition on while you do it or a spark may set fire to the fuel! Quote Link to comment Share on other sites More sharing options...
thesloth Posted June 25, 2015 Author Share Posted June 25, 2015 Thanks guys. I'll give that a go in the morning Quote Link to comment Share on other sites More sharing options...
Phooey Posted June 26, 2015 Share Posted June 26, 2015 What about valve sticking/clearance? Could it be that the exhaust valve is not opening to clear the spend exhaust?That would explain pressure build up and pot filling with fuel. Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 26, 2015 Share Posted June 26, 2015 What about valve sticking/clearance? Could it be that the exhaust valve is not opening to clear the spend exhaust?That would explain pressure build up and pot filling with fuel.its a 2 stroke so no valves to stick open............well as far as i know its 2 stroke Quote Link to comment Share on other sites More sharing options...
Phooey Posted June 26, 2015 Share Posted June 26, 2015 What about valve sticking/clearance? Could it be that the exhaust valve is not opening to clear the spend exhaust?That would explain pressure build up and pot filling with fuel.its a 2 stroke so no valves to stick open............well as far as i know its 2 stroke Ah, didn't realise it was a two-stroke! Another dumb move. lolApparantly, it is direct injection also so won't have carb either! Am I right? Quote Link to comment Share on other sites More sharing options...
thesloth Posted June 26, 2015 Author Share Posted June 26, 2015 What about valve sticking/clearance? Could it be that the exhaust valve is not opening to clear the spend exhaust?That would explain pressure build up and pot filling with fuel.its a 2 stroke so no valves to stick open............well as far as i know its 2 stroke Yes, its a 2 stroke Quote Link to comment Share on other sites More sharing options...
thesloth Posted June 26, 2015 Author Share Posted June 26, 2015 What about valve sticking/clearance? Could it be that the exhaust valve is not opening to clear the spend exhaust?That would explain pressure build up and pot filling with fuel.its a 2 stroke so no valves to stick open............well as far as i know its 2 stroke Ah, didn't realise it was a two-stroke! Another dumb move. lolApparantly, it is direct injection also so won't have carb either! Am I right? Nope, they made an injection model as well as a carb model. I have the carb'd one.Thank you still Quote Link to comment Share on other sites More sharing options...
Mr Fro Posted June 26, 2015 Share Posted June 26, 2015 Hmm... Yeah, plug, fuel off out and kick it until it clears.A flooding carb shouldn hydrolock a 2-stroke that quickly unless you've got the worlds worst leak as the fuel vapour goes via the crank case (unless your crank is full or petrol/oil/water etc).If the problem persists, I'd be tempted to drain off the crank and go from there. Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 26, 2015 Share Posted June 26, 2015 it could also be that the exhaust is blocked and not allowing fuel out of the engine it could be blocked with fuel or carbon deposits Quote Link to comment Share on other sites More sharing options...
thesloth Posted June 26, 2015 Author Share Posted June 26, 2015 So I got myself a can of carb cleaner. Took it off the bike etc. But the eejit before me has rounded off the screws on the bowl bit at the bottom (waiting on a friend dropping off a dremmel)I'm about to look at the exhaust, but I don't know how I'd tell if the exhaust is blocked or not Quote Link to comment Share on other sites More sharing options...
thesloth Posted June 26, 2015 Author Share Posted June 26, 2015 The exhaust was LITERALLY full of oil. I look like the mud monster now xDGonna have a good clean and reassembled then hope for the best!Thanks for the help, guys Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 26, 2015 Share Posted June 26, 2015 sounds like that will be your problem using cheap 2 stroke oil causes some of that problem in he old days we used to seal one end up and then fill exhaust with caustic soda /water mix leave overnight then rinse out following day that got loads of the crap out,i would leave the carb alone untill you have done the exhaust and see what happens then Quote Link to comment Share on other sites More sharing options...
Mr Fro Posted June 26, 2015 Share Posted June 26, 2015 sounds like that will be your problem using cheap 2 stroke oil causes some of that problem in he old days we used to seal one end up and then fill exhaust with caustic soda /water mix leave overnight then rinse out following day that got loads of the crap out,i would leave the carb alone untill you have done the exhaust and see what happens thenThose were the days! Quote Link to comment Share on other sites More sharing options...
thesloth Posted June 26, 2015 Author Share Posted June 26, 2015 sounds like that will be your problem using cheap 2 stroke oil causes some of that problem in he old days we used to seal one end up and then fill exhaust with caustic soda /water mix leave overnight then rinse out following day that got loads of the crap out,i would leave the carb alone untill you have done the exhaust and see what happens then That was my plan for now. I'll set that up before I go work. Thanks for the advice Quote Link to comment Share on other sites More sharing options...
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