Has my NS125 barrel been lined?

[Dilusi]

Hi,

I've just bought a NS125 (1987) and started to strip it down. The engine needs a rebuild as the previous owner melted the piston.

When I took the barrel of to inspect the damage I noticed it seems to have a steel liner in it. Someone on another forum said that the barrel is standard and needs plating and cannot be rebored but I'm not convinced.

I thought the plated barrels were solid alloy without a liner?

Can someone who knows have a look at the pics of the barrel and tell me for definite?

https://www.byphotos.com/album/4133986

[disco_stu]

Hi
Looking at your photo's I say that yes your barrell is a cast iron lined one. You can see the different materials by the different colour and also the join line.

A nonliner or plated barrell would have the same aluminium colur right to the bore edge or the start of the plating.

Having a liner means your barrell can be rebored to the next bigger piston size if need be and if oversize pistons are available for it.

Have a reputable machine shop measure it up for you. If there is not any damage from the piston meltdown or too much wear, you may get away with having it honed and a new piston and rings of the same size.

cheers

[Dilusi]

^^Thanks.

also, you can't really see it in the pics but the ports on the barrel do not line up perfectly with some of the ports on the liner meaning there is a bit of a lip in places. Would this affect the running/performance at all?

I'm going to take it to a specialist and let them have a look but any other advise in the mean time would be appreciated.

[joe black]

send you r barrel to langcourts weston-s-mare ,they are the experts used them numerous time excellent firm to deal with

[Dilusi]

^^I really want to find somewhere local if poss (Stourbridge, West mids) so I can just drop it of and collect it.

Anyone able to recommend someone in that area?

[Kickstart]

Hi

Stock NS125 barrel is plated but that one looks like a liner has been bodged in.

Closest place to you is probably PJ Engineering in Wolverhampton.

All the best

Keith
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[plugger147]

Just took a peak at the one I have in the shed and the one on my bike (yes it is in bits. )the one on my bike is original the others had a liner bodged in and looks just like yours. Kickstarts right ( theres a surprise )the standard one is plated and can't be rebored
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Tristan the wrote: just whipped off my trousers to find a big bruise on my arse, caused by matt rear ending me...

[alains]

you should buy a barrel-piston kit , but i do not know if they are still avaiable . phone at DSS 01728833020
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the worst day fishing is better than the best day working

[Dilusi]

[alains]

exactly , it seems in very bad condition for a re-plating , better to buy a kit or change bike
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the worst day fishing is better than the best day working

[Dilusi]

[alains]

i do not recommand big bore on this bike , like the NSR125R the max size admissible for the bottom-end is 150cc , otherwise you will change your engine very shortly
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the worst day fishing is better than the best day working

[Dilusi]

The Athena barrel I've been looking at is standard 124cc

https://www.ve-uk.com/demo/index.php?search_group=41&search_lists=7&search_make=28&search_model=278

[alains]

so better fitting the genuine !
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the worst day fishing is better than the best day working

[Dilusi]

[Kickstart]

Hi

I am not keen on the idea of putting cast iron liners into engines designed to be plated, you can probably get away with boring it out and fitting a new piston. A rebore will not be expensive, but not sure how easy it will be to source an oversize piston (certainly not from Honda).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dilusi]

Thanks, I've seen a few places that sell oversized pistons so I'm gonna take it somewhere and get it rebored for now.

[Grubby]

You can get a 150cc kit for them no worries. This is a standard size for the bike in Thailand & they run them with no bottom end problems at all.
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I am me & you are he & we are all together. See how they run like pigs from a gun!

[Dilusi]