* "Fit in frame" is ambiguous: Are you asking if it will physically fit into a 2001 KX100 frame, or a different frame entirely?
* Engine variations: There might be slight differences between the engine from a 2001 KX100 and other models, which could affect compatibility.
To help you get a proper answer, please provide:
* What frame are you trying to put the engine in? (Model, year)
* What specific engine are you referring to? (2001 KX100, or another model/year)
It's essential to research the compatibility of parts before attempting any modifications. Improperly matched parts can lead to safety hazards and performance issues.
I recommend consulting with a qualified motorcycle mechanic or checking out online resources like forums specific to your bike model.
