Maintenance & Technical > KX500 Original

All about reed spacers -

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Timbowe:
Soo what is the correct thickness? Do different thickness's make for varying engine torque ranges? Like the thinner the less torque and thicker more low end? Also back in the day, those who knew, used to bead blast the enterance of the intake port. This would mix up the fuel better. As opposed to smoothing the port off to resist drag. So many theorys, so little time, so little money! :|

Paul:
Correct, Timbowe. Rough on the intake is supposed to help keep the fuel / air charge atomized, and smooth on the exhaust to help flow. :mrgreen:

hughes:
I made my spacer out of 3/8 alumn. This might be stuid but I am going to throw it out there. I was thinking about tuning the thickness of the spacer by adding a extra reed gasket on before I mount the spacer(two gaskets, same as a thicker spacer, maybe three gaskets) What do ya'll think.

alan:
From Boyesen

THE GATEKEEPERS OF POWER

Looking to increase the performance of your Polaris watercraft without making a large investment? Try the new Reed Valve Spacer Kit from Boyesen. The Reed Valve Spacer Kit increases the intake tract length by moving the reed cage away from the crankshaft. This increases the flow volume under the piston and the rear boost ports in the crankcase. In this position, the reeds are allowed to function more efficiently. The action of the reeds are no longer impeded by the adverse effects caused by the rotation of the crankshaft. What you feel is improved low to mid-end response, more torque and horsepower.

dennis:
I don't think the spacer helps because of the tranfer port distance. since the ports are in the crankcase their pretty far from the reeds. The change of the length of the intake track is prbibly the main cause of the torque increase. The volume of the crankcase is changed somewhat if the spacer is between the reed cage and the cyl.. The crankcase volume would stay the same if the spacer was between the reed cage and the carb. Has anyone tried this? I've heard that manufactures try to keep the crankcase volume as small as possible to get as much horse power as they can. Putting the spacer between the cage and the carb might be a better way.

Dennis in Arizona

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