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Conversion Question

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How big an engine can I get in a 1986 cr125 frame? Will a xr500 engine fit?

The reason I ask is because I can get a good deal on the cr and I want a project.

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Two stroke engines have significantly less height to them than four stroke engines. Even putting an xr100 engine in a CR80 frame, requires extensive modification of the frame. If you are asking whether the four stroke engine will fit without modification, I would say that it would probably be no. However, I do not have firsthand experience with that frame nor that engine. Those are just my general thoughts on putting four strokes into two stroke frames.

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