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Post by super150 on Feb 17, 2013 8:48:25 GMT
Oh the joy of having a bloody scooter… Found that the lugs have broken off the piston circlip which has resulted in the following attached pics Attachments:
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Post by super150 on Feb 17, 2013 8:52:03 GMT
So, is it knackered or what? Havnt even ran the poxy thing on yet (sigh) Attachments:
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Post by super150 on Feb 17, 2013 9:17:28 GMT
Grrrrrrrrr... Attachments:
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Post by super150 on Feb 17, 2013 9:26:45 GMT
No damage in there by the looks of it. Anyone know why this would happen…apart from it being me of course Attachments:
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Bugger
Feb 17, 2013 12:41:46 GMT
Post by sbwnik on Feb 17, 2013 12:41:46 GMT
TBH that doesn't lok too bad - usual test on the cylinder, run a finger nail over the scratches. If you don't 'catch' on it, then it's fine.
The piston needs chucking though, I'd not run it like that. The head should be fine.
As to 'why?' I'd guess at the circlip not being correctly in place, clipping the edge of a port and then making an exit through the exhaust port in several dozen pieces.....
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Bugger
Feb 17, 2013 12:44:56 GMT
Post by pxguru on Feb 17, 2013 12:44:56 GMT
Unlucky! It looks bad but I can't really see any damage that won't clean up. Are there any grooves in the barrel near the top? Post a picture of the broken circlip parts so we know what type are talking about...
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Bugger
Feb 17, 2013 16:24:24 GMT
Post by sbwnik on Feb 17, 2013 16:24:24 GMT
Flashback.. I did this with my Polini.
I put square section circlips in instead of wire ones. Up, down, up, down, up, down, up, down, ping, rattle, smash, blugh.
Changed the piston and it kicked up immediately
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Bugger
Feb 17, 2013 20:37:17 GMT
Post by kru251 on Feb 17, 2013 20:37:17 GMT
That looks like a chuck the piston job, clean the head a bit as that's not bad at all and the bore looks pretty good from the pictures too. As was stated abouve check with a finger nail for scoring. Old piston may have had a bit of gumminess (can't think of a better word right now so maybe the circlips didn't seat well? Could be a lot worse. I've used Yamaha piston circlips as good quality and so far OK.
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Post by super150 on Feb 17, 2013 23:02:02 GMT
Cheers guys- when I was putting that kit on one of the new circlips pinged off somewhere never to be found. So I used both old circlips(which were not the same as the new ones) newbie mistake #132 It still runs, but as you say I shouldn't really run it like that eh. What about the head, can I use an abrasive to smooth it out abit? So if I get a new piston can I use the old rings, and do I have to run a new piston in?
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Bugger
Feb 18, 2013 3:29:56 GMT
Post by pxguru on Feb 18, 2013 3:29:56 GMT
You were so luckily there. If a circlip gets jammed between the piston and barrel it can really do some proper damage.
Its a pretty good rule to only use the circlips that come with a piston. And always put the gap at the top (that's nearest to the piston crown).
Give that piston a good clean up and it might not look so bad. I hate chucking a piston until I have had some fun out of it!
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Post by super150 on Feb 18, 2013 6:44:19 GMT
Yeah?… the words 'me' and 'lucky' don't normally get used in one sentence! Barrel definately fine. Piston as you can see which looks like its been mugged, how would you suggest I clean it up abit? As for the head, I can catch my nail on the dings, so…? I don't wanna bin it if I can get abit more out of it. Like I said, it's not even run in yet. When I do get a new piston, was thinking about the 63mm Grand Sport. Don't know how much difference it would make though and if its worth it?
My wife has a point when she says that I mend it more than I ride it!
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Bugger
Feb 18, 2013 11:29:08 GMT
Post by pxguru on Feb 18, 2013 11:29:08 GMT
Get some medium grit wet and dry and get it all nice, shiny and smooth. The dents wont make any difference but all the sticky up bits must be completely gone. Take the rings off when you do it and give it a good wash after. Post a pic when you're done to see if it passes muster.
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Bugger
Feb 18, 2013 15:56:03 GMT
Post by bryno on Feb 18, 2013 15:56:03 GMT
as said, the head looks fine
if you are not getting the barrel honed, you can use the same rings with no need to run in if you put the rings in the same order on the new piston
BUT new rings will probably come with the piston, if so, get the barrel 'glaze busted' first to get he best out of tne new rings, and yes, do run it in again
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Bugger
Feb 18, 2013 23:06:50 GMT
Post by kru251 on Feb 18, 2013 23:06:50 GMT
I have in the past supported the head well in lots of towels so as not to break anything fin-wise. Then, I have used a steel pin-punch and tapped it to 'push' the spiked metal back down and then used fine wet n' dry to clean them up further. Be CAREFUL with that stuff to not go over the head mating surface; so tear off little pieces rather than trying to use a large sheet!!
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Post by super150 on Feb 19, 2013 0:00:46 GMT
Thanks for all the advice/tips. I'll let you know how I go ;0)
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Post by super150 on Feb 19, 2013 9:58:53 GMT
Bit of a sand with some 600 and 1200 grit. Attachments:
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Post by super150 on Feb 19, 2013 10:18:00 GMT
Good to go or what? I didn't take the piston off, just cleaned the crown. Had a spare G circlip so bunged that in. Whats the easiest way to drop the engine so as to get the piston off/on. There must be a way to do the work without pulling it out and dumping in on the work bench? What's a good system method that makes life abit easier. ie: changing the other circlip? Attachments:
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Bugger
Feb 19, 2013 13:14:58 GMT
Post by bryno on Feb 19, 2013 13:14:58 GMT
sounds like you're about there then
you dont need to remove engine to take the piston off, I usually take the fly side circlip out then push the gudgeon pin through from the other side with a rod or screw driver (through the gap in the clip), if its tight, warm the piston round the pin with a hot air gun first
Never needed to hammer the pin as I dont like the risk of damaging the crank
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Bugger
Feb 19, 2013 18:30:55 GMT
Post by kru251 on Feb 19, 2013 18:30:55 GMT
Yes, I only take out one circlip and push it out too. That piston picture. The section at 10:00. Is that 'nick' extending to the side of the piston at all? Maybe it just looks as if it does. If so, carefully take that edge back a bit so as to leave no section extending beyond the circumference of the piston. Looks a pretty fair job though so well done!
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Bugger
Feb 20, 2013 6:13:13 GMT
Post by pxguru on Feb 20, 2013 6:13:13 GMT
Piston looks much better now. Plenty of life left in that yet. You should have taken it off before you cleaned it though. Make sure you take it off and wash it all before you run it! When it is off thoroughly check it for hairline cracks. I usually lay the whole scoot over onto the engine and take the back wheel off. From there you can take out the other circlip. Then stand it up and push the gudgeon pin through from the outside.
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Post by super150 on Feb 24, 2013 2:57:52 GMT
Cheers for that guys. I took the piston off and gave it a good clean in some thinners. However, I cannot get a 15mm G Circlip around here. No Polini stockists in Adelaide, or Australia as far as I'm aware. So, I ended up doing a SIP shop (always dangerous). You have to spend $100 before they will ship out here. Bought some spare circlips and thought bugger it might as well buy a new piston and rings as a spare too! (Plus a few other pieces I need..… but don't need, you know what it's like) It's just not as convenient for me to get things as it is for you people back in the mother land. 😔
Racing Exhaust SIP Road v Racing Exhaust Scorpion.…opinions anybody??
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Bugger
Feb 24, 2013 6:44:59 GMT
Post by pxguru on Feb 24, 2013 6:44:59 GMT
You must have really lost that circlip. Did it ping down a billabong? ;D
I can't seem to ever just buy one thing from SIP either! Quite a difference between those exhausts. What do you want from this scooter?
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Bugger
Feb 24, 2013 9:40:19 GMT
Post by super150 on Feb 24, 2013 9:40:19 GMT
I think an ant must of ran off with it or something, they're big buggers here :0)
Reliability would be nice!.....or am I asking abit too much there?! I currently have the SIP exhaust and it's fine, doesn't look as good as the Scorpion would however. Anyway I was just wondering what sets this exhaust (and a few of the others ie SERIE PRO and JL) apart from the cheaper ones?
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Bugger
Feb 24, 2013 11:18:21 GMT
Post by pxguru on Feb 24, 2013 11:18:21 GMT
So you just want the holy grail. Speed and reliability!
An expansion type exhaust is tuned to give max power at a certain rpm window. If you work out the max usable rpm for your engine you will find your exhaust choice much easier! And if you can't be bothered just choose the one you like the sound of ;D
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Post by super150 on Feb 24, 2013 11:45:22 GMT
Pretty demanding of me eh!
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Bugger
Feb 24, 2013 22:33:40 GMT
Post by sbwnik on Feb 24, 2013 22:33:40 GMT
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Bugger
Feb 25, 2013 17:23:50 GMT
Post by bryno on Feb 25, 2013 17:23:50 GMT
exhaust alone wont change 'reliability', but its the start of a slippery slope
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Bugger
Feb 26, 2013 9:33:04 GMT
Post by pxguru on Feb 26, 2013 9:33:04 GMT
Standard exhausts almost never crack and fall off! Or cause overheat at high revs 'cos they're not suited or jetted wrong! Quite right, the slippery slope begins here and ends with a tyre lasting longer than a piston ;D
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Bugger
Feb 26, 2013 10:23:00 GMT
Post by super150 on Feb 26, 2013 10:23:00 GMT
Again......Bugger eh?!!
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