Ricky Posted June 30, 2013 Share Posted June 30, 2013 So basically I asked if I could have the old engine from my Yamaha and the mechanic happily gave it me so I thought I'd do what the mechanic didn't do and strip it down and see where the fault is and I took and the barrel, etc off and first thing I saw that didn't look right was the piston...http://imageshack.us/a/img5/6685/bfti.jpghttp://imageshack.us/a/img819/1403/j3oe.jpghttp://imageshack.us/a/img35/1668/iov9.jpgWhen I hold the piston and spin the engine round it doesn't make that clunking noise like it did previously?Did I just waste 723 quid on something as simple as that?! Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 30, 2013 Share Posted June 30, 2013 no you didnt because all the missing bits of piston have gone down into the bottom of the engine and lots of it would of been ground into dust making any oil left like a grinding paste that passed through all the bearings and oil ways possibly blocking some as well Quote Link to comment Share on other sites More sharing options...
Ricky Posted June 30, 2013 Author Share Posted June 30, 2013 Stupid question but how can I tell between dead bearings and non dead bearings? Quote Link to comment Share on other sites More sharing options...
Joeman Posted June 30, 2013 Share Posted June 30, 2013 that well and truly knackered mate...new engine was the best option. Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 30, 2013 Share Posted June 30, 2013 a dead bearing will rumble/make a noise as you spin it where as a new/good bearing will be silent,or it will have more play/torerence in it than it should have Quote Link to comment Share on other sites More sharing options...
Ricky Posted June 30, 2013 Author Share Posted June 30, 2013 If I split the crank case and investigate the bearings and they're okay, clear any debris at the bottom should it be okay? Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 30, 2013 Share Posted June 30, 2013 i wouldnt be trying to use it again but it might be worth holding onto just for bits like the clutch and gearbox out of it should you ever need them Quote Link to comment Share on other sites More sharing options...
Ricky Posted June 30, 2013 Author Share Posted June 30, 2013 I was thinking more for a go kart I might just sell the undamaged parts on it try and make some money back Quote Link to comment Share on other sites More sharing options...
Guest Posted June 30, 2013 Share Posted June 30, 2013 DAMN.. you did a good job of that one ricky Perhaps if you strip the engine down, flush it all through etcyou may be able to save the engine, replace the piston, and should be good to go..would be a good engine for go kart, or keep the engine for spare/spare parts... Quote Link to comment Share on other sites More sharing options...
Fozzie Posted July 1, 2013 Share Posted July 1, 2013 Break the engine into its key components and lay it out nice and easy so you can put it back together again.As it's only a 125 there aren't that many bearings. You could go through the whole engine realligning parts and rebuilding it steadily to produce an as new motor. Will cost a couple of hundred quid in bearings and bits but you could do it. Would be a good learning experience I suppose Quote Link to comment Share on other sites More sharing options...
klingelton Posted July 1, 2013 Share Posted July 1, 2013 Break the engine into its key components and lay it out nice and easy so you can put it back together again.As it's only a 125 there aren't that many bearings. You could go through the whole engine realligning parts and rebuilding it steadily to produce an as new motor. Will cost a couple of hundred quid in bearings and bits but you could do it. Would be a good learning experience I suppose I'd give my left tooth for a project such as that - alas i don't have the space and the wife wouldn't allow me to strip an engine on the kitchen work surface.It's like a lego set for adults, you'd be beaming if you got it running again! Quote Link to comment Share on other sites More sharing options...
Ricky Posted July 1, 2013 Author Share Posted July 1, 2013 Break the engine into its key components and lay it out nice and easy so you can put it back together again.As it's only a 125 there aren't that many bearings. You could go through the whole engine realligning parts and rebuilding it steadily to produce an as new motor. Will cost a couple of hundred quid in bearings and bits but you could do it. Would be a good learning experience I suppose That's a great idea Cheers dude Quote Link to comment Share on other sites More sharing options...
acting_strange Posted July 1, 2013 Share Posted July 1, 2013 Break the engine into its key components and lay it out nice and easy so you can put it back together again.As it's only a 125 there aren't that many bearings. You could go through the whole engine realligning parts and rebuilding it steadily to produce an as new motor. Will cost a couple of hundred quid in bearings and bits but you could do it. Would be a good learning experience I suppose That's a great idea Cheers dude As far as bearings are concerned you do not necessarily have to buy from the honda dealer...get them out and have a look on their sides where you should find a series of numbers. These you can then use to find a match and possibly get them cheaper... Quote Link to comment Share on other sites More sharing options...
Joeman Posted July 1, 2013 Share Posted July 1, 2013 You might struggle pushing some of the bearings out though.. unless you have a bearing press laying about at home!!?Personally, i would strip it down to be nosy, clean up the parts and flog the lot on eBay.let someone else pay for new bearings Quote Link to comment Share on other sites More sharing options...
acting_strange Posted July 1, 2013 Share Posted July 1, 2013 You might struggle pushing some of the bearings out though.. unless you have a bearing press laying about at home!!?Personally, i would strip it down to be nosy, clean up the parts and flog the lot on eBay.let someone else pay for new bearings In the 30 yrs that I was fixing cars, vans and anything else that had an engine I never had a bearing press....but I did have a heat gun and lots of patience...even something to align a crank with after splitting it can be made up at home with some common sense... Quote Link to comment Share on other sites More sharing options...
Tiggie Posted July 1, 2013 Share Posted July 1, 2013 keep it for practising oil changes! Quote Link to comment Share on other sites More sharing options...
acting_strange Posted July 1, 2013 Share Posted July 1, 2013 keep it for practising oil changes! Cruel but truthful....lol Quote Link to comment Share on other sites More sharing options...
Ricky Posted July 1, 2013 Author Share Posted July 1, 2013 keep it for practising oil changes! Quote Link to comment Share on other sites More sharing options...
Joeman Posted July 1, 2013 Share Posted July 1, 2013 You might struggle pushing some of the bearings out though.. unless you have a bearing press laying about at home!!?Personally, i would strip it down to be nosy, clean up the parts and flog the lot on eBay.let someone else pay for new bearings In the 30 yrs that I was fixing cars, vans and anything else that had an engine I never had a bearing press....but I did have a heat gun and lots of patience...even something to align a crank with after splitting it can be made up at home with some common sense... You mean the same kind of common sense that makes sure the engine has oil?? Quote Link to comment Share on other sites More sharing options...
Stu Posted July 1, 2013 Share Posted July 1, 2013 Personally it's not worth the hassle also how does the barrel look? Also the crank could need a re grind if any material has got behind the bearing Strip clean and sell Quote Link to comment Share on other sites More sharing options...
acting_strange Posted July 1, 2013 Share Posted July 1, 2013 You might struggle pushing some of the bearings out though.. unless you have a bearing press laying about at home!!?Personally, i would strip it down to be nosy, clean up the parts and flog the lot on eBay.let someone else pay for new bearings In the 30 yrs that I was fixing cars, vans and anything else that had an engine I never had a bearing press....but I did have a heat gun and lots of patience...even something to align a crank with after splitting it can be made up at home with some common sense... You mean the same kind of common sense that makes sure the engine has oil?? Good point .... well made....but we were all young once... Quote Link to comment Share on other sites More sharing options...
Fozzie Posted July 1, 2013 Share Posted July 1, 2013 Crucially check behind the bearings where the grinding effect takes place when shards of metal get free...If your bike went pop and stopped it's unlikely it got around. If you did mile after mile with it running then you could be in trouble. But if you got away with it and you can check it's always worth it for the experience it gives.You just need some circlip pliers, heat gun and maybe a small blow torch, and if you can make one or find one a bench press. I managed to get one for £40 off a mate, 10 tonne one too! If you don't already I have a haynes manual for a YZF in my garage somewhere. Will try to find it for you if you don't have one. Quote Link to comment Share on other sites More sharing options...
Ricky Posted July 1, 2013 Author Share Posted July 1, 2013 Crucially check behind the bearings where the grinding effect takes place when shards of metal get free...If your bike went pop and stopped it's unlikely it got around. If you did mile after mile with it running then you could be in trouble. But if you got away with it and you can check it's always worth it for the experience it gives.You just need some circlip pliers, heat gun and maybe a small blow torch, and if you can make one or find one a bench press. I managed to get one for £40 off a mate, 10 tonne one too! If you don't already I have a haynes manual for a YZF in my garage somewhere. Will try to find it for you if you don't have one. Thanks a lot for the reply I'm going to check the state of everything first because all it's potentially going to be used for is a go kart or a project of some sort The barrel is in great condition there's no scratches or damage to it which is surprising when looking at that piston I'll be sure to send you a PM if the damage isn't to bad and then try and rebuild it Stupid question but my bike is fuel injected so would I have to buy a new one of them or can I try and find an adequate carburettor or does it not work like that? Quote Link to comment Share on other sites More sharing options...
Fozzie Posted July 2, 2013 Share Posted July 2, 2013 You can make it carbed, as long as the spark timing is correct then there is no issue.The Rieju RS3 125 uses a carbed version of the engine. Makes more power so if you can source the electrics and carb for one of those you will be in business. Quote Link to comment Share on other sites More sharing options...
Ricky Posted July 2, 2013 Author Share Posted July 2, 2013 You can make it carbed, as long as the spark timing is correct then there is no issue.The Rieju RS3 125 uses a carbed version of the engine. Makes more power so if you can source the electrics and carb for one of those you will be in business. As the engine won't be used using the same electronics as on my yamaha I'll have to convert it to carbs won't I?New to this stuff and especially electrics I'll split the case tonight inspect the bearing make a video and some pictures and start a thread later on If the damage is going to be loads then I'm going to just sell the working parts if not ill be borrowing your manual Quote Link to comment Share on other sites More sharing options...
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