Hello everyone! I am the current owner of a 1988 swiss edition Yamaha Dt125R (3DD engine code). I've been having problems with power. I know it's restricted to 9kw but I'm wondering how. If I'm not wrong only the expansion chamber is different than on a full power dtr, on the other hand I saw someone on here post about cutting up a 3DD pipe and it only had a catalytic converter (which mine also has) but as far as I know the catalytic converter doesn't affect power, only sound and emissions.
So now I'm wondering what I should try to get some more power out of it. Thank you for your help!

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