Question about 1986 Suzuki Rg 250

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2 stroke 'break in'

What is the best way to 'run in' 'break in' a new top end on a suzuki 80cc 2 stroke engine?

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  • rigger094 Jul 29, 2009

    thank you very much



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Run a mixture of 32/1 and ride at less than 1/2 throttle for the first tank of fuel then go to 30/1 and ride normal

Posted on Jul 29, 2009


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I just rebuilt the top end of my dirt bike, its a 1996 wr 250 2 stroke. I was breaking the motor in , and it was running great so after about 1/2 hour of riding I decided to stop and ask a fellow rider for...

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Im 16, and ive never ridden a 2 stroke in my life and im thinking of getting a yz/sx 125 for trail riding. ive never been able to afford a modern 4 stroke so ive been riding a crf230 and a 1980 tt500 yam....

I would suggest a 250 2-stroke or a 4-stroke. Lots of power, lots of pull and the motor would likely last you for years. I've raced both the 125 and the 250 2-stroke at the pro-am level (A-class) and the difference in engine life is tremendous. I would re-ring a 125 every week (running 26:1), while with a 250 I could go for 2-3 months or more without doing the top end while running 32:1.

A YZ 125 will definately be a bit of maintenance - primarily because it has a single ring and the ring doesn't last long. A pro or semi-pro racer would re-ring every race (when the 2-stroke was popular) - some races I would re-ring in between motos. I know you won't be racing, but I would still imagine you would want to freshen up the top end at least every other month at the most. Granted - you can re-ring a 125 in about 45 minutes for a cost of about $18 if you know how and it costs a LOT more for a 4-stroke and is more of a job.

Other than the ring, the rest of the maintenance will be about the same between a 2-stroke and a 4-stroke. You'll still have to do your air filter every ride and your engine oil (tranny oil in a 2-stroke) every other ride. Tires, spokes, sprockets, clutches, chains, brakes - all pretty equal maintenance between the two. Lots of variables, of course.

The difference will be keeping the motor fresh and for that, the 4-stroke will beat the 125 2-stroke. Not the 250 2-stroke, though - these motors last as long or longer than the 4-stroke and are a LOT cheaper to maintain/rebuild.

This is MY experience and my opinion. Your mileage may vary.


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How do I fit a piston into 80cc trail bike? I'm not sure of the model but it has a 2 stroke engine. Serial #JSiDC13A000503257

squeeze the rings tight against the piston and slide the cylinder down over the top off the piston. you can use WD40 to help slide it down smoother. once the cylinder is in place, hold it in place with one hand and push the kick lever down to make sure the piston slides up and down the cylinder smoothly.

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My 1996 suzuki rm80 js1rd starts thne bogs when you give it high revs backfiers then dies

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I seem to have a top end splutter on my mx125 i have changed the cdi and coil and the full loom and it is still doing it i had a new carb fitted and new reeds and a new plug can any 1 help me plz

2-stroke engines misfire regularly under light loads — sounds more like a flutter or sputter..

My guess would be that at the high end you are running out of torque, resulting in a light-load condition, and that characteristic 2-stroke misfiring is taking place. If you are simply running out of the engine's ability to give more, you might be stuck with this behavior.

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Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Use Two Stroke ENGINE oil in the pump.

Top rating? Thanks!

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