Question about 2003 Suzuki RM 125

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Sputtering I have a 2003 Rm125 bought from a local dealer. The bike was a trade in back in April of 2008. It has been sitting there ever since waiting for someone to buy it. Well I bought it today and after warming up it seems to sputter when you get on the throttle. Could this just be from sitting or can it be something more? I put new fuel in it when I got it home and it still does it. Cleaned the carb and rode it for a good hour on the track. And it still is doing it. Any help would be great...

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  • chriskowalcz Dec 12, 2008

    I am in the process of checking that out now. It sputters just before it hits the power band and then gets through it. I have no history on the bike other than it belonged to a spoiled 17 year old kid that rode it for a little while until he got a 4 wheeler. you know the type. It does smoke a whiteish blue and drips some black oil out the pipe, but that is due to it running rich I believe. I would rather run it that way until I am sure. I am running at 40 to 1 mix. 

    Thanks Chris

  • tpa2461 Mar 02, 2009

    I have 2004 and a 1999 rm 125 my 2004 has been doing the same thing . I have done the top end rebuilt the carb tried all jetting lean and rich still does it . next I went to Elec and checked the sator and stator pick up and also put the timing up and down still does it . the only thing i have not done is coil or replace stator and elec box I have no problems with the 99 Rm And I also have a 2004 RM 250 and no problem there Please Help


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I would take it back to the dealer. They should have done a PDI Before you picked it up It should not have left the dealer If it didnot run right...

Posted on Apr 28, 2009

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I also had this problem on a 200 blaster that i had and the mix was not right at first i was mixing it 32:1 and it was on a new build (just had the top end bored and all new rings piston reds the whole 9 yards) when i got the advice to run it at 28:1 it solved the problem you might try to run a heavier mix such as a 32:1 and see how that goes but i know in my old blaster it made all the differance in the world

Posted on Feb 19, 2009

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It could be a few things causeing that. Make sure the air filter is cleaned and properly oiled, check the ignition system for good spark and make sure the stator is timed properly, try a new spark plug and gap it to spec., inspect the reeds, make sure they are not broken or warped, check the compression. If everything checks out ok, it might just be a jetting or carb adjustment issue.
Where abouts in the throtle range does it "sputer" ? during acceleration ? at full throtle ? at an idle ? Do you know any history on the bike as to when the top end was last re-built ? Does it seem to smoke alot from the exhaust ? whiteish blue smoke ? brownish black smoke ? Do you notice if your coolant level goes down alot ?

Posted on Dec 12, 2008

  • Kenny W Dec 12, 2008

    Too much oil will make it sputter but 40:1 should be fine. The type of oil you use can make a difference aswell because some oils do not burn as well as others. I always used "Amsoil Dominator" synthetic in my yz250. Never had a problem, never fouled a plug, and it went 8 years on the origonal bottom end bearings. You can try adjusting the air screw (open it up a bit). Also try lowering the needle one clip position (one groove towards the top of the needle). Also check the burn on the plug. It should be a light brown colour. Black meens too rich, white meens too lean. It does sound more like a jetting issue though. That will take some testing and track tuning to get it straightend out. You'll need to know what carb is on the bike (mikuni or keihin), then you'll need to find out what jets are in it now. Go to your local shop and order 3 jet sizes leaner and 3 jets sizes richer. Try each jet in sequence untill you get the desired performance and plug burn (light brown).


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