The 1998 Honda XR80R used in this example will be extremely similar to the XR100, CRF80, CRF100 and more. Don't ever be afraid to work on a simple little motor like this.
Please be aware that this is a 4 stroke, a similar video on a 2 stroke would be much different as the smallest leak in the crankcase is a much bigger deal. Therefore I do not talk about the seals etc.
This is my first post here so please forgive the lack of detailed "instruction" in my wording.
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