Question about 2003 Suzuki RM 125

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It blows white smoke been sittin for a long time are the rings gone it had full engine rebuild two years ago

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Not neccesarilly. the rings could just need to be seated properly. If it doesn't have many hours on it after the rebuild, you may just need to run it for a while to seat the rings. Don't push the motor or the rings will break and your screwed at this point. There might be some other seals that are dried out from sitting and these too will need broken in. Run it at variable engine speeds for at least 10-12 hours. This is a 2 stroke isn't it. If so use double oil in the mixture to ensure you are getting proper oil to cylinders. use double oil first 2 tank fulls and then slowly wean it back to regular oil over time, it won't hurt to run the oil a little rich anyway, might save you another rebuild!

Posted on Nov 14, 2010

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  • mxtras
    mxtras May 16, 2011

    I would be very cautious taking any advice from someone who doesn't know if a RM125 is 2-stroke or a 4-stroke or if it's a multi cylinder engine. He might now engines, but sometimes, things don't translate from one engine to another.

    For the RM125 to blow white smoke, it's likely you have a leaking cooling system. White smoke = burning antifreeze/coolant. Blue smoke is normal for this bike because it is a 2-stroke. I would strongly suspect a bad head or base gasket.

    And - the single ring in a typical 2-stroke 125 doesn't last that long. The above poster gives solid advice for breaking in a V-8 but by 10-12 hours on a 125 2-stroke your ring likely should be replaced. And - the original poster said he had a complete rebuild 2 years ago. It's probably time for at least a ring. You can re-ring 2 or three times before you should replace the piston. For racing, a ring lasts about 1 moto or about 1 hour - maybe 2 of hard riding. For joy riding, the ring might last 15-25 hours before you will begin to see a drop in compression - of course there are lots of variables here.

    No need to run double the oil on break in. Run your regular mix (should be 32:1 - no leaner) and just go easy on the engine for the first 2 thermal cycles, then let her rip. These single ringers benefit from running more oil - I raced using 24:1. More oil = better engine life, more cooling, reduced friction and more prolonged power. You might have to re-jet for it, but it's worth it.

    Back to the original question (even though it's from 6 months ago) - for something like this, I would open it up and replace the ring, base gasket and head sealing rings. Problem solved.

    This advise is from 30+ years of racing motocross and maintaining a fleet of MX bikes.



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