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Boyesen reeds are an incredibly popular upgrade not just for PW50/QT50 but for any 2-stroke being used for racing
Just look at those ports
5mm "65cc" Parmakit cylinder kit for your Piston Port Derbi
IP67 rated body protects your new sensor from the elements and the 60cm long wire means you can mount it where its convenient to see
This cylinder is made specifically for the Bye Bike and no other engine
Derbi Flat Reed 43.5mm "65cc" Metra Kit - USED liquid Boyesen reeds are an incrediblyUsed 65cc Metra Kit cast iron kit for Derbi Flat Reed. We found this cylinder on an imported Derbi Variant Sport that we rebuilt. The bore of the cylinder is in great shape! The piston is in poor shape. The scuffs on the piston could be smoothed out and maybe you could use it with new rings but we'd recommend a new piston. The 43. 5mm Airsal piston for the new style aluminum kits would be a perfect replacement. Just notch the skirt to match the
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