aftermarket pistons... any good?

[Timmeh]

Hey chaps

Might need to rebuild a TZR125 over the coming weeks and eBay has pistons kits-a-plenty and cheaper and easier than yamaha.

Are they OK to use or should I just go OEM?

Also, I think I am right in that I'll need to measure the squish once its back together, and that can be changed by using ally gaskets of varying thickness, so if anyone knows where to get those from, I'd be grateful as well.

Cheers

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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[cb1rocket]

i'm using aftermarket pistons to good effect, done 1000 miles so far and done 2 different engine rebuilds now using them

[symonh2000]

Aftermarket pistons will vary.

Some like Mitaka are really good, some of the cheaper ones on ebay might be made of silver cheese and should be avoided.
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Four strokes is two strokes too many.

[MarJay]

Mitaka or Prox for Yamaha pistons. Anything else is a waste of cash.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Vincent]

I've found that Jap pistons tend to be better quality than most but I sold a few Spanish and Czech RD125 LC piston kits a while back and the people that used them said they were fine. One thing, it doesn't seem very easy just by looking at them, although outrageously badly made ones stand out.

A fine opportunity for the old "fixed Piston" pic I reckon:-

https://i77.photobucket.com/albums/j71/Drewskovitch/PistonBodge.jpg
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Space Is Deep

[symonh2000]

Bloody hell, how long did that last for?
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Four strokes is two strokes too many.

[Shaft]

^^^ Is that chemical metal, moulded round a web of welding wire?
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Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
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[Vincent]

I can't remember the full story but it was used apparently
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Space Is Deep

[Timmeh]