[William Martin]

This all depends on how experienced you are in general with small engines. If you are used to working on high performance stuff, the only thing I would suggest is that you take the crank/rod assembly to a shop that can do the rebuild, or just buy that assembly new from a Honda bike shop. It’s kind of tricky stuff, aligning the two crank halves and pressing together…buy some experience, you won’t regret it. The rest you should be able to handle. You will need to do a thorough cleaning/flushing of the crankcase to get the various other bits of metal out that may be hiding in there some place. If you don’t have the Honda cr125 manual, get one and read it before you dive into this! Probably you will want to replace crank main bearings while it is apart, much cheaper than after one lets go…

 

[Brad Clem]

If you have decent experience working on stuff, you should be able to do this.  Rocky Mountain ATV has a 3 part YouTube video that I used the first time I did it.  You will need a few specialty tools.

Tip: Do not let the transmission fall out or lose order of its parts.

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