spat a piston ring help!!!!!!

Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

well finished stripping her down she loks liek she spat the top ring Evil or Very Mad

so advice people on is my more still ok and how do i find out wha size piston i need?

https://i10.tinypic.com/4gorwd4.jpg
https://i3.tinypic.com/2gwuie1.jpg
https://i16.tinypic.com/4ih44g7.jpg
https://i10.tinypic.com/4cllkip.jpg
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

so how do i tellw at size piston i need???

https://cgi.ebay.co.uk/HONDA-NS125-F-R-STD-PISTON-KIT_W0QQitemZ130011138144QQihZ003QQcategoryZ10460QQrdZ1QQcmdZViewItem
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

rpg · Scooby Slapper Joined: 08 Jun 2005 Karma :

hi, unfortunately that looks to have made a bit of damage both to your barrel and piston! I am not sure on your type of barrell whether it is nicasil lined or has an iron liner? as if its nicasil, it will need to be relined, whereas if its a iron liner it can be rebored with new piston.

Do you have any idea what has caused this?

Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

aint got a clue what caused it just wear and tear i guess
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

0ddball · World Chat Champion Joined: 15 Jul 2005 Karma :

You need to sort the barrel before deciding what size piston you need. Though in your case as the barrel is plated, getting it bored out and replated works out about the same as a new standard barrel.

If it were me i'd get a new one and standard size piston.

Marci · Brolly Dolly Joined: 01 Sep 2005 Karma :

Yep, tis nicosil plated. Looks a bit too much metalwork spattered atop that piston to be just rings to me... checked big end bearings?? Could well have blown bigend bearings and spat em up transfer port resulting in the damage to the rings. When was big end last done? May be worth doing a full rebuild anyways...

Got a pic of inside of cylinder head too? Likely that'll want some work doing to it also...
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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

just got of phone to
https://www.dpsracing.co.uk/index.php

if it needs horning(sp?) £10
macheine the head £15
piston£40 (compleete)
if it need replating £ 90 als5

hmm so better send it away and whish for the best

so how can i tell if big end is fukd?

engine had a full rebuild 4k ago
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

Grab the base of the conrod and check for vertical play (not side to side). If you can feel any the big end has gone and it's crank time.
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Marci · Brolly Dolly Joined: 01 Sep 2005 Karma :

Also remove flywheel cover, turn by hand whilst holding conrod, feel if there's any points where it sticks and refuses to turn...
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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

done both of them and answer is no play vertically what so ever small abount side to side say 3-4mm

then turn over by hand soes it freely with no hassle Question

or

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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

Marci · Brolly Dolly Joined: 01 Sep 2005 Karma :

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CBR170 engine, custom chassis - www.minimotoscene.co.uk

Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

well my gouges aint that deep could i get it machien welded etc @ £30 got to be worth a try ???

also a new barrel from antena £104 all in

where else can i look for a barrel dont want big bore but a 140 or 150 kit is tempting
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

jimbothe · World Chat Champion Joined: 29 Sep 2006 Karma :

A little side play is normal,i wouldnt worry about that.From what you say your bearings are intact and are working fine.

It looks to have scored the barrel pretty well.Did you rebuild it yourself before? It looks as if it has done a fair few more miles than 4k since the rebuild.
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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

no previous owner rebuilt it (so he said)

also i have screwed the fuck out of it from time to time ???

and the other q bee told crank seals could have blown from hard reving??

it didnt size etc just died down....

could i get it machined?
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

jimbothe · World Chat Champion Joined: 29 Sep 2006 Karma :

Found a couple of items of interest for you...

https://cgi.ebay.co.uk/HONDA-NS125-NS-125-ENGINE_W0QQitemZ280069307332QQihZ018QQcategoryZ10460QQrdZ1QQcmdZViewItem

https://cgi.ebay.co.uk/HONDA-NS-125-MOTORCYCLE-ENGINE-TOP-END-REBUILD-KIT_W0QQitemZ130070197207QQihZ003QQcategoryZ25623QQrdZ1QQcmdZViewItem

Not sure if they are any good but may be worth a try Thumbs Up

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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

been looking for that rebuild oen on ebay thanks
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

jimbothe · World Chat Champion Joined: 29 Sep 2006 Karma :

Another complete engine if you were interested.I know a rebuild would give you peace of mind but it never hurts to buy another lump,stick it in and rebuild the other in your own time Thumbs Up

https://cgi.ebay.co.uk/HONDA-NS125-NSR125-COMPLETE-ENGINE-NEW-TOP-END-MORE_W0QQitemZ300071012728QQihZ020QQcategoryZ10460QQrdZ1QQcmdZViewItem
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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

its a lot of money for a engine of unkonw quality probally pick a whole bike up for twice that
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

hmmmmm

https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=012&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=220070829582&rd=1&rd=1
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

jimbothe · World Chat Champion Joined: 29 Sep 2006 Karma :

That looks ok Thumbs Up

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Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

just other side of country Sad

____________________
Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

just got in now i remember whay i hate public transport Evil or Very Mad

new barrel (genuine honda) £109
New piston (genuine) £29.99
New rings (genuine) £12
New gaskets (genuine) £12
New curclips £2
New sparkplug £4
New Small end bearing £5
SEcond hand cylinder head £20

in all im skint but
had thema ll for £200 cash
____________________
Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<