Rm125 spark plug questions.

Kyle220
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Kyle220
I'm thinking about doing a budget build Rm125 for a play bike. Most likely 2004-07 model as I hear 01-03 weren't very reliable. I've read about having to run a special $30 plug for certain years, anybody know what years and why?? Also 01-03, were they really that bad because Ive found some locally for around$1000-1200 in decent shape, I'd hate to pass on it if it's just minor issues. Thanks guys!
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Bruce372
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Bruce372 7/27/2019 10:49am
7/27/2019 10:49am
The 2004 engine is a lot superior to the 2003 and older. The 2005 also has significant upgrades over 2004... similar engine but better suspension.

You have to run the expensive plug, all other plug drop the electrode strap and ruin the engine
3
HighPlainsSquid 7/27/2019 12:54pm
7/27/2019 12:54pm Edited Date/Time 7/27/2019 12:56pm
My '02 was great. No problems with it in over a year of solid riding. It has the adjustable powervalve, too, which is kind of fun.

I researched it and ran the special plug. By the time I changed EIX because I was scared it would come apart, the special plug was no more expensive. And I DID have an EIX come apart in my '05 KX 125 (which is supposed to use the same plug for the same reason) so....
1
seth505
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seth505 7/27/2019 5:16pm
7/27/2019 5:16pm Edited Date/Time 7/27/2019 5:17pm
I seized 2 cranks in my 03 then did a full OEM balanced crank etc and she was solid.
Yes, as mentioned, run the expensive plug.

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