14/45 gearing would be a change of 10% so your speed at 6800rpm would change to 66mph. 13/42 would be do the same also. Rocky mt has the 42 tooth rear sprocket for $20. I have used these before - they do fit.
91-93 Suzuki DR250S IS SAME AS GASSER (must be the "S" model - the non S model DR uses a different sprocket).
https://www.rockymountainatvmc.com/p...procket?v=2580
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