Is it necessary to change the rings and piston on a 2 stroke every 40 hours?

Question by jimmy: Is it necessary to change the rings and piston on a 2 stroke every 40 hours?
Im buying a 2 stroke dirt bike, a yz 125. They guy said I need to change the rings and piston every 40 hours but I have never heard of that. My friends have been riding dirt bikes for ever and they said on his 100 he has over 300 hours on it and never had to do that. What should I do? listen to my friend or the guy im buyin it from?

Best answer:

Answer by Zack
Every 40 hours would be ideal if your a motocross racer and you ride the bike as hard as you can everytime your on it, but if you just do a lot of trail riding/occassional jumps then no not every 40 hours. It just depends on how hard you ride your bike. I changed mine once a year before riding season every year and I dont even think I needed to do it that much, I just did it to be on the safe side.

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  1. Reply
    Dan May 10, 2013 at 7:49 pm

    That is THE worst sales pitch I’ve ever heard. There are XXX’s of ’60’s 2 strokes that have never seen a ring set. Go with the friends of this one.
    At best, SOMEONE told the seller the big lie and he’s passing it on.
    The worst, you have to rebuild it after you wear it out, no more work than his maintenance.

    I’m not a 2 stroker but Ive never heard anything like that.

  2. Reply
    jihidiwhite May 10, 2013 at 8:15 pm

    yeh it depends on the engine/manufacturer, i have a small 40cc 2 stroke engine that has an emission standard of up to 300 hours, so basically you can ride the heck out of it till then, its the tanaka 40cc engine, strong engines made in japan. i wish they could custom fit the tanaka 65cc on a dirt bike with a nice exhaust, it would be so reliable. im not sure on dirt bikes engines though what exactly they are made of, tanaka engines have forged pistons and connecting rods stock, chrome plated cylinder sleeves, fiber based clutch shoes and are very heavy duty that can last a few years until a rebuild.

  3. Reply
    mn May 10, 2013 at 8:15 pm

    my air cooled 350 RD Yamaha had 60,000 Ks on it before rings & pistons..

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