You are right I only answered the question of how to do a 1 to 6 reduction Pulley. The real question is how to engineer a Roller Pump to a Honda engine. What I missed asking was the HP of the engine and the Horse power requirement and RPM of the Pump.
BTW most PTO I am familar with are rated at 540 RPM.
Ric u forgot our Polk county redneck engineering on my rig? Dang you've lost your young mind