GS500 motor in a GS450?

[snark]

Just thinking about the possibility...

Does anyone know, or has anyone tried, putting a late model GS500 motor in a GS450 frame?

I'm tempted to give it a shot someday.

[Charlie G]

I know I've read the exhaust ports were moved on the 500 to accomidate the revised frame. I can't remember which way they were moved. Headers might have to be custom.

cg

[Macmatic]

I've been looking at GS450 and GS500 stuff lately so I'm pretty sure on the following...unless I'm wrong.

The exhaust ports on the GS500 head point towards the middle and the GS450 ports point outward. The GS450 frame tubes are in the center and the 500 tubes are at the outside, this is why the ports are changed on the 500, to fit the new frame. This is also why exhaust doesn't interchange between them.

Could you swap in only the pistons and cylinders? You'd keep your stock mounts and stock head but get a 50cc bump. I haven't read anything on that but I bet it could be done.

/\/\ac