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About Mexbiker

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  1. Mexbiker

    KX125 Big End seizure

    Hi there - have a KX125 which, from the frame number dates from 1990. Whilst riding it over the weekend the bike seized. Have taken head and barrel off and found fragments of metal in the inlet port which I am guessing are from the big end bearing (duh, I was running it on around 50:1 and now realise it should have been around 30:1!). A couple of questions for those far wiser than me! How do I remove the rear swing arm pivot, which is the final obstacle to removing the motor? The bolt was only finger tight on the left side, but am not sure how to remove pivot bolt - does this simply require drifting out, once I have removed rear brake pedal (workshop manual is on its way, but will not arrive for several days!) Is a complete new bottom end kit still available for this model (preferably in the UK, but if not, from the US)? Aside from a puller, are there any special tools required to complete the strip down and replacement of the entire bottom end? I appreciate that given the age of the bike, the replacement of the entire bottom end might not be capable of being economically justified, but I am keen to do this, if only to broaden my experience of two stroke motors! Cheers! Mexbiker