Ricky Posted February 18, 2013 Posted February 18, 2013 Hi I'm Rick and I'm new to TMBF I'm 16 so can only own a 50cc bike but 17 soon and hoping to get the CBR125!http://www.youtube.com/watch?v=zKqYk3phdiMIt has had a new CDI, spark plug, spark plug cap, new battery and I've cleaned the carburetor yet it won't start!It starts up like it did in the video with the choke fully on but if i let it drop RPM it will stall like it did I've cut out about 10 minutes of me running up and down the road as you probably don't need to see that.It has had a new top end rebuild since a piston ring snapped and scored the piston.I've replaced the piston rings and the piston itself just not the cylinder all new gaskets and one of the top bolts is missing would that matter?The air filter was removed for this video as part of testing the bike.It's had all fresh petrol, 2 stoke oil etc.It is Peugeot's poor excuse of a motorbike called the Peugeot XR6 50cc 2 stroke.Minirelli AM6 engine everything is stock on it.If I undo the screw which the bowl is located fuel pours out so fuel is definitely getting to the carb.After is started like in the video the plug was wet and sort of black, wiped off easily.Sorry about the poor video i had my iPhone taped to the mirror on the bike, don't have one of them fancy GoPro things quite yet! =)Any help would be greatly appreciated, thanks! Quote
Tango Posted February 18, 2013 Posted February 18, 2013 Welcome to the Forum mate........introduce yourself in the Newbies section when you get a mo....... When you say a bolt is missing.....where exactly?.......if it's on the cylinder head you could have problems..... If it will only run with the choke on I'd be looking towards low compression as the problem. You replaced the piston and rings....but was the barrel scored? Quote
Ricky Posted February 18, 2013 Author Posted February 18, 2013 Welcome to the Forum mate........introduce yourself in the Newbies section when you get a mo....... When you say a bolt is missing.....where exactly?.......if it's on the cylinder head you could have problems..... If it will only run with the choke on I'd be looking towards low compression as the problem. You replaced the piston and rings....but was the barrel scored? Hi I will do that right away, thanks! =)Yeah there is four bolts on the cylinder head and one is missing.http://imageshack.us/photo/my-images/688/img05451w.jpg/The barrel was scored but only a slight bit, hardly seemed worth replacing as I'm running low on cash.Thanks! Quote
Tiggie Posted February 18, 2013 Posted February 18, 2013 have you adjusted the idle screw on the carb? Quote
Ricky Posted February 18, 2013 Author Posted February 18, 2013 have you adjusted the idle screw on the carb? Yeah I started with them all screwed in and then slightly adjusted each one. Quote
Tango Posted February 18, 2013 Posted February 18, 2013 Yeah....a missing bolt on the cylinder head wont be helping things..... Quote
Ricky Posted February 18, 2013 Author Posted February 18, 2013 Yeah....a missing bolt on the cylinder head wont be helping things..... Would it be doing what it's doing though? I'll go to partsco soon and get a replacement, thanks =) Quote
Tango Posted February 18, 2013 Posted February 18, 2013 Yeah....a missing bolt on the cylinder head wont be helping things..... Would it be doing what it's doing though? I'll go to partsco soon and get a replacement, thanks =)Well....if you have a decent spark and fuel is getting into the combustion chamber the most likely thing to stop it running correctly is lack of compression..... I had a loose cylinder head bolt on one cylinder on an RD350 years back....it ran like sh*t......and leaked fuel/oil from the head gasket area.....so, a missing bolt could cause your problems..... Quote
Ricky Posted February 18, 2013 Author Posted February 18, 2013 Yeah....a missing bolt on the cylinder head wont be helping things..... Would it be doing what it's doing though? I'll go to partsco soon and get a replacement, thanks =)Well....if you have a decent spark and fuel is getting into the combustion chamber the most likely thing to stop it running correctly is lack of compression..... I had a loose cylinder head bolt on one cylinder on an RD350 years back....it ran like sh*t......and leaked fuel/oil from the head gasket area.....so, a missing bolt could cause your problems..... If that was the only problem with it that'd be great, I'll go and get a bolt tomorrow and let you all know, thanks =) Quote
eastanglianbiker Posted February 18, 2013 Posted February 18, 2013 i would say replace the head gasket as well but it certainly will never run with one bolt missing completly as the compression is blowing out round it Quote
Ricky Posted February 18, 2013 Author Posted February 18, 2013 i would say replace the head gasket as well but it certainly will never run with one bolt missing completly as the compression is blowing out round it I've replaced all the gaskets in the top end there is just that one bolt which I'm hoping is that's wrong with it =D Thanks =) Quote
eastanglianbiker Posted February 19, 2013 Posted February 19, 2013 i would say replace the head gasket as well but it certainly will never run with one bolt missing completly as the compression is blowing out round it I've replaced all the gaskets in the top end there is just that one bolt which I'm hoping is that's wrong with it =D Thanks =)where you have tightened the remaining 3 bolts down it could of damaged the head gasket replace the last bolt and washers if there was any and hopefully you will get away without doing head gasket again Quote
Ricky Posted February 19, 2013 Author Posted February 19, 2013 i would say replace the head gasket as well but it certainly will never run with one bolt missing completly as the compression is blowing out round it I've replaced all the gaskets in the top end there is just that one bolt which I'm hoping is that's wrong with it =D Thanks =)where you have tightened the remaining 3 bolts down it could of damaged the head gasket replace the last bolt and washers if there was any and hopefully you will get away without doing head gasket again I've been working all day trying to earn as much as I can for a bike at 17 so not been fiddling with it today, I asked my mum to go get me another bolt god knows what she got me probably something completely wrong but I'll be sure to try that bolt very soon, thanks for your patience guys and gals Quote
eastanglianbiker Posted February 20, 2013 Posted February 20, 2013 looking at the pic its not a bolt you need its a nut and there should be a crush washer under each nut on the head as well so the nut doesnt bite directly into the cylinder head casting Quote
Ricky Posted February 20, 2013 Author Posted February 20, 2013 I didn't see any washers when I took the nuts off so does it need to have them? What would happen of it did bite into the cylinder head? Quote
eastanglianbiker Posted February 20, 2013 Posted February 20, 2013 the washers spread the load slightly for the nut to grip more of the surface look on this picture it is item number 6 is the nut and number 7 is the washer http://www.vespaspares.co.uk/HTML/spare ... 82151.HTML it would be worth ordering the correct bits from someone like this as you then know they are right Quote
Ricky Posted February 20, 2013 Author Posted February 20, 2013 the washers spread the load slightly for the nut to grip more of the surface look on this picture it is item number 6 is the nut and number 7 is the washer http://www.vespaspares.co.uk/HTML/spare ... 82151.HTML it would be worth ordering the correct bits from someone like this as you then know they are right Am I seeing things, 4 washers and a nut?!http://img24.imageshack.us/img24/6527/44265505.pngStill ordered them though =) Quote
Ricky Posted February 20, 2013 Author Posted February 20, 2013 Just been messing around with the bike this evening and that brand new piston I put in, about a week ago?http://img46.imageshack.us/img46/811/img05501z.jpghttp://img685.imageshack.us/img685/5590/img05511f.jpgI love watching money burn (sarcasm) =( Quote
eastanglianbiker Posted February 20, 2013 Posted February 20, 2013 theres the other reason it wont start have you checked the condition of the barrel as well as i bet that also has huge score down it.you must of not fitted the circlips correctly looking at that or you put the piston in the wrong way round Quote
Ricky Posted February 20, 2013 Author Posted February 20, 2013 theres the other reason it wont start have you checked the condition of the barrel as well as i bet that also has huge score down it.you must of not fitted the circlips correctly looking at that or you put the piston in the wrong way round This is going to sound idiotic but does the arrow go in facing forward, towards the front of the bike? Quote
Ricky Posted February 20, 2013 Author Posted February 20, 2013 http://imageshack.us/a/img138/8302/img05531.th.jpghttp://imageshack.us/a/img716/7930/img05541.th.jpghttp://imageshack.us/a/img820/6932/img05551q.th.jpghttp://imageshack.us/a/img62/3189/img05561q.th.jpghttp://imageshack.us/a/img716/5439/img05571o.th.jpgThis is the cylinder and gaskets, is it bad enough for me to get another cylinder kit?http://www.ebay.co.uk/itm/Barrel-and-Pi ... 2c69a66b1dI seriously appreciate everyone's help given to such a newbie so far on this forum. Thanks a bunch. Quote
eastanglianbiker Posted February 20, 2013 Posted February 20, 2013 yes it does and then the piston rings go round the piston and close onto a small pin in the groove they will be in different places in each groove Quote
eastanglianbiker Posted February 20, 2013 Posted February 20, 2013 that barrel is scrap thats a huge score down the length of it, i think you will be better off trying to find an complete engine for the bike will be cheaper than rebuilding the engine you have got Quote
Ricky Posted February 20, 2013 Author Posted February 20, 2013 that barrel is scrap thats a huge score down the length of it I've ordered it and will get someone to professionally fit and let you know soon on what the outcome is! =) Thanks for your help! =) Quote
eastanglianbiker Posted February 20, 2013 Posted February 20, 2013 you have ordered the barrel new at 300 quid?? Quote
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