250 r frames
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The '86 (and I think '87) frames are know to be stronger as they have a few extra gussets from the factory. As far as I know the frame geometry was the same for all 4 years. The 88-89 swingarm and a-arms are the main chassis differences, but the geometry of the actual square frame tubing is the same other than the motor mounts and rear grab bar mounts.
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