583s have alot of compression i dont know what the comp. readings on mine is but i bet 160 is about stock. Milling the head down will raise the compression but if the sled only has 385 miles on it then I bet its a stock sled.
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2001 Yamaha YZ 125
Gold Frame
RG3 Suspension
Answer Pro Tapers
Boyesen Water Pump
Twin Air Powerflow Air Filter
VForce 3 Reeds
FMF Gold SST Pipe/FMF Titanium 2 Silencer
Excel Colorworks Rims (Gold)
Pro Circut Magnesium Clutch/Ignition Covers
Hardstyle USA Sprockets/DID VM X-Ring Chain
Wiseco Hot Rods Crank w/ Athena Cylinder Kit
Braking Rear Caliper w/ Braking Wave Rotors
Rifled Carb
RG3 Triple Clamps
Hinson Pressure Plate, Basket, Springs, and Hub
Hydraulic Clutch Lever
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