If a dirt bike brand does't make rings and piston for bike anymore like let's say 86 KTM gs 350 could I get an aftermarket piston and rings?

I have an 86 ktm gs 350 and I recently picked up a Can Am ASE 200 (both rare left kicker rotax engine bikes) the ktm does start... but I just want to know when it's time and I need rings or piston. Can I measure cylinder/rings etc or bug and aftermarket that'll fit? Idk if it has stock piston or not. I doubt it but you never know. The bike is in great shape. The ase needs rings and possibly a piston. Please if anybody can help me, links be great. Thank you!

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  • 4 weeks ago

    e-bay is your friend.

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  • 1 month ago

    Join a forum. When I had my PE175, the PE owners forum had people who had worked out what piston kits from other makes fitted the PE engines.

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    • Billy1 month agoReport

      Also bought a running dr650 at one point for $100 i couldnt believe it. Guy was moving

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  • 1 month ago

    Like dude, Rotax is still, like, in business. KTM ain't never made nuttin' fur dat engine cuz, you see, the engine manufacturer manufactures the engine, which is why the manufacturer is called the manufacturer. Seems obvious.

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  • Anonymous
    1 month ago

    https://www.ebay.com/itm/2005-2086 ktm gs 3506-KTM-250-SX-Dirt-Bike-Namura-Piston-Rings-66-34mm/202793253745?hash=item2f376b7b71:g:KykAAOSw7ZddmCGb

    or:  https://www.bikebandit.com/fox/00js9qu

    Or you can go to Hastings and order by size: https://www.hastingspistonrings.com/

    I have some "oldies", too, 1966-'68,  I will bear with worn rings. I think, In my case they are just stuck.

    Yes., reinserting them squarely in bottom of cylinder and measuring ends gap with a feeler will tell if worn or not. Not sure what gap should be. Many replace on Any teardown just like gaskets. Get the manuals. I procrastinated on mine, then  bought one. . An eye opener. Of the 3 different models I have, I will use lightest frame, biggest wheel, best brakes,  most powerful engine in my "enduoe" bike. Mix 'n' match.

    https://www.ebay.com/sch/i.html?_from=R40&_trksid=...

    https://www.ebay.com/sch/i.html?_from=R40&_trksid=...

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  • Anonymous
    1 month ago

    Before you panic and waste money, carry out a compression test on the bike. In any case 'if it ain't broke don't fix it'. You can determine bore wear by measuring the end gap in a new ring set in the bore. Even feeling the bore for a ridge near the top will give you an idea of wear.

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  • Anonymous
    1 month ago

    Get used engines from Ebay.  There are plenty of aftermarket pistons and rings for dirt bikes.  You just need to know original specs from a service manual.

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