hi i have a piaggio nrg mc3 i used it today and it started fine stopped at traffic lights and it just cut out and then it wouldnt start again. wouldnt even start of kick start ive cleaned the carb, and spark plug got a good spark. i did get it started again but went round block and it felt like it was loosing power now wont start at all can any one tell me what the problem might be thankyou

mario, May 2010

hi try taking your air filter off the kicking it over with your hand over the carb blocking air in then take it off the kick it if it starts its the vacume hope this helps.

ben, September 2011

Hi I have piaggio nrg mc3 lc it started to lose loads of power pullin of was so shit so I brought a new Cluth and piston new belt and rollers and cleaned the carb but it still the same and it some times don't Evan start do u think it could be lack of airflow or somethink thanks

Dan, May 2011

a leaking exhaust gasket will cause a loss of back pressure that will only affect performance at lower revs but it will not stop it starting,the kickstart is just sticking if it doesnt return properly dont worry about that too much. as i said in the 1st reply and m also mentioned the compression needs to be sufficient and if its not then it wont run,your more than likeley had a partial seizure before the lights and when the revs dropped down to an engine speed that allowed the compression to drop off it will stop like it did.its really worth taking the head /exhaust and barrel off to have alook at it if you cannot determine if the compression is good enough.The piston will have some scores on the side of it and be a bit blackened usually also the barrel may have matching marks if so a new piston and rebore to the barrel will be the answer but the cause could be many things.FIX THE CAUSE.or you will be back at square one again!
1,make sure the head gasket is not all mangled as these have habit of killing head gaskets if its a watercooled model the gasket is just a rubber oring type gasket and they disintegrate.
2,the oil pump and water pump(just oil pump on air cooled models) are both driven off a small belt behind the variator that runs off a small pulley wheel on the crankshaft ,these belts break and causes bad problems like heat seizures and seizures due to lack of lubrication.

adam bike doctor, May 2010

My son had the same problem and the air filter wasnt on properly. Once we fixed that it worked fine... worth trying.

John, May 2010

sounds like compression (ish) to me, please check your compression

m, May 2010

hi adam i dont know about the compression but wen i kick the kickstart the lever dont cum all the way back up. and the gasket for the exhaust has cum off and it is warm air cumin out of it. but that was like that wen i bought it and it was runnin fine until today. but i dad said there is no petrol on the the head because the spark plug was dry.

mario, May 2010

it could be lots of things mario.does the bike have good compression?when you kickstart it does the lever offer a resonable amount of resistance against your foot?does the exhaust gas seems to be coming out freely and is it hot cold or warm?the gas that is.

adam bike doctor, May 2010