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03 cr 125 trouble

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Bike will start up fine and will run fine for a few minutes but then bogs down. I put in a new spark plug and it started up and same thing happened. any ideas?

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I've got an '03 CR125 too and the same thing happened to me a couple months ago. Turns out I forgot to remove the plastic bag that I usually put over the air filter when I wash the bike. It's amazing how much you learn over the years from doing every conceivable lame azz thing possible...

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I just had to throw a size smaller pilot jet in my 05 cr125. It would file the plug before it could warm up. The warmer weather made it run very rich. Put a new stock plug in and try turning your air mixture screw out to lean it up and if that doesn't do it follow this to dial it in:

http://www.maximausa.com/technical/l...summer2001.pdf

Edited by honda53

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It was happening to mine, my gas had too much oil in it. Kept fouling the plugs, wouldn't idle correctly, ect.

Also check your carb, jets, fuel lines, air filter...

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