anyone know anything about 4 stroke scooter engines - Page 3

pauls0701 · May 15th, 2011, 17:29

well looks like it could be dead! have today stripped it down and the piston has melted at the side rings are shot and bore is marked. looking at 230 for new piston and barrel or 50 for just new piston and take the risk the barrel might be ok. but really think it about rights it off

scr8pdo · May 15th, 2011, 18:39

Quote:

Originally Posted by pauls0701

well looks like it could be dead! have today stripped it down and the piston has melted at the side rings are shot and bore is marked. looking at 230 for new piston and barrel or 50 for just new piston and take the risk the barrel might be ok. but really think it about rights it off

It depends how bad the bore is, if its only slight, you can buy/or borrow a honing tool which will fit on a leccy drill, plenty of oil and take your time, you will prob get away with it, ive seen it loads of times (melt piston) and a bit of bore scoring, take the barrel off and run your fingers around without looking, feel for damage, if you can get it smooth again, the rings will take up a bit of play, thats the whole point, ive seen cars when a belt has snapped and left bits of broken valve embedded in the piston crown, dont matter what that looks like as long as it seals, crikey, ive fixed bent valves with a screwdriver, bent em back lol and got car running again.

Check these out:

http://cgi.ebay.co.uk/Draper-Brake-C...e#ht_500wt_922

scottishvolvo · May 15th, 2011, 19:21

Any idea what caused the melt down in the first place? 2nd hand engine maybe worth a thought.

pauls0701 · May 15th, 2011, 20:21

no idea what caused it there was no overheating as had only been running 5 mins at most and there is a temp gauge on dash so can only think it was oil stavation but is only contained to the piston so maybe was a bit low but did only check it a few days before it went so not really sure.

think i will prob try and get a new piston and just see if i can get it running again cant really afford to just right off £600.

have looked for second hand engines and cant find one

pauls0701 · May 15th, 2011, 20:23

thanks for the link looks cheap enough to get and at least try and save the bore

Oilydad · May 15th, 2011, 20:38

Sorry. Posted twice see next post.

Oilydad · May 15th, 2011, 20:45

I'd simply put it down to experience and keep a sharp eye on the Ebay auctions.

Like this: http://cgi.ebay.co.uk/sym-125-euro-m...item4cf7368a68

Currently at.............99p

For the hassle you're going to have, I'd sell the parts for spares, and offset it against a better scooter.

Bug*er I know.....but take it from an old guy. It's better than throwing good money after bad!

pauls0701 · May 17th, 2011, 18:26

thanks for the reply but have managed to fine a complete piston kit for just £25 so going to try it first as not costing to much. the honing tool i will have to get the bigger one which is slighty more expensive at about £20 but at least i will have it for the future. having looked at the bore better today its not as damaged as i firsat though as it looks like most if it is melted bits of piston that are just stuck to it.

im feeling that more confident about it today that i have started to rebuild it and even fitted the new belt and rollers i had brought about a month ago

mistmover · May 19th, 2011, 18:13

Quote:

Originally Posted by pauls0701

i brought a sym joyride 180cc scooter about a month ago and all was going well untill yesterday when on way home from work it just cut out on me and wouldnt re start.

i have checked the following
spark, good strong one
fuel, double checked this by squirting some easy start in the carb,
checked the cam timing. spot on.
compresion. not go a compresion tester but put finger over spark plug hole and there seemed plenty there.

anyone got any ideas what else i can check as brought this to save some fuel money traveling to work and it stands me at £600 so need to get it running else i could have just used the car for the next year and been just as well off

check the ht lead as ive had bike that when plug was out it sparked but as soon as i put the plug back the ht lead changed angle and it wouldnt spark,plus if petrol getting in but not sparking the plug will be wet with petrol,and if you was racing the bike hard you may of messed up the timing.....dry plug no petrol...best of luck

May 15th, 2011, 19:21	#23
scottishvolvo Premier Member Last Online: Nov 17th, 2023 00:15 Join Date: Dec 2004 Location: Glasgow	Any idea what caused the melt down in the first place? 2nd hand engine maybe worth a thought. __________________ Chris '98 S40 2.0T..Gone. 2000 S40 2.0 SE Auto and loving it. 2014 V40 Cross Country Please consider registering with the Anthony Nolan Trust, you could save a life.

May 15th, 2011, 20:38	#26
Oilydad Premier Member Last Online: Mar 21st, 2016 21:21 Join Date: Aug 2009 Location: Exeter Devon	Sorry. Posted twice see next post. __________________ Are We Nearly There Yet! No longer a VOLVO owner, not by choice, but 'cause they don't make proper Volvos any more! Last edited by Oilydad; May 15th, 2011 at 21:00.

May 15th, 2011, 20:45	#27
Oilydad Premier Member Last Online: Mar 21st, 2016 21:21 Join Date: Aug 2009 Location: Exeter Devon	I'd simply put it down to experience and keep a sharp eye on the Ebay auctions. Like this: http://cgi.ebay.co.uk/sym-125-euro-m...item4cf7368a68 Currently at.............99p For the hassle you're going to have, I'd sell the parts for spares, and offset it against a better scooter. Buger I know.....but take it from an old guy. It's better than throwing good money after bad! __________________ Are We Nearly There Yet!* No longer a VOLVO owner, not by choice, but 'cause they don't make proper Volvos any more!

May 15th, 2011, 17:29	#21
pauls0701 Member Last Online: Oct 12th, 2015 19:22 Join Date: Aug 2010 Location: swindon	well looks like it could be dead! have today stripped it down and the piston has melted at the side rings are shot and bore is marked. looking at 230 for new piston and barrel or 50 for just new piston and take the risk the barrel might be ok. but really think it about rights it off

May 15th, 2011, 20:21	#24
pauls0701 Member Last Online: Oct 12th, 2015 19:22 Join Date: Aug 2010 Location: swindon	no idea what caused it there was no overheating as had only been running 5 mins at most and there is a temp gauge on dash so can only think it was oil stavation but is only contained to the piston so maybe was a bit low but did only check it a few days before it went so not really sure. think i will prob try and get a new piston and just see if i can get it running again cant really afford to just right off £600. have looked for second hand engines and cant find one

May 15th, 2011, 20:23	#25
pauls0701 Member Last Online: Oct 12th, 2015 19:22 Join Date: Aug 2010 Location: swindon	thanks for the link looks cheap enough to get and at least try and save the bore

May 17th, 2011, 18:26	#28
pauls0701 Member Last Online: Oct 12th, 2015 19:22 Join Date: Aug 2010 Location: swindon	thanks for the reply but have managed to fine a complete piston kit for just £25 so going to try it first as not costing to much. the honing tool i will have to get the bigger one which is slighty more expensive at about £20 but at least i will have it for the future. having looked at the bore better today its not as damaged as i firsat though as it looks like most if it is melted bits of piston that are just stuck to it. im feeling that more confident about it today that i have started to rebuild it and even fitted the new belt and rollers i had brought about a month ago

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)