NSR 125 pistons and rings, ¿where and what to buy?

[david451]

i bough my nsr as a second hand bike with 34k milleage,its at 41k now, im clueless about what mainteance the bike has received, for now the engine seems to work fine i dont find anything strange, i dont have a tool to measure the compresion of the cylinder but the idle is pretty stable and as top speed it reach about 145km/h more or less, dont know if its normal power or not.

Anyway, since its better prevent than cure i was thinking about change piston and rings, after some research i found mitaka, meteor, vertex, wossner, namura pistons, and of course original honda pistons.

So, ¿where to get a quality piston at a good price? ¿are anything outside vertex and wossner worth it? i checked davidsilverspares but pistons seems to be out of stock...

[chris-red]

You'll have to strip it down first to see the what piston is already in there first, it may be an oversize.
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[davethekwak]

[chris-red]

[david451]

even considering the owner put in new piston and rings(which i doubt) they would have by now 7k, so anyway the maintenance schedule ask for a rings change at 12k milleage...

believe me i have learn by bad ways how truth this phrase is "if it aint broken dont fix it" and expending 100 euro on piston and rings and another 20 on gaskets doesnt make me very happy either.....but thing is, using 120e now or risking to fuck up the whole cylinder and be forced to expend 300e later

Another solution is buying a compresion tester for 18e, but, anyway, soon or later i will be forced to buy a piston and rings so any advices on quality prices and where to buy are very apreciated!

[stevo as b4]

Scheduled maintenance on a two stroke as said is the right thing to do. You can damage the head, Cylinder, crank/rod and even the cases if it siezes or the piston or rings break up.

The last cylinder I had welded, repaired and re-plated came in at £416, but that included some tuning work and a new matched piston kit and gaskets.

Its very different on a four stroke, as wear or low compression alone is very unlikely to cause catastrophic block/head damage. The weak link in a thumper is usually the head gasket.

In fact if you don't overrev a four stroke or break a cam belt/chain, your very unlikely to cause any serious component damage by letting it wear out and smoke/knock before a re-build.

You could score crank journals I suppose from extreme bearing wear, or from spinning a shell. But it's not that likely as shells don't spin for no reason, and serious wear enough to damage the crank would mean the engine would be making such a horrific knocking, you'd be too scared to run it.