Yamaha YZ125 Engines / Parts
ProX has a great line of parts for your YZ125. They have piston kits that have been precisely manufactured with low-expansion, low-friction piston alloy, using state of the art equipment. This installation-ready replacement piston kit comes with piston rings, a wrist pin, and circlips. ProX also has a Connecting Rod kit that is made of only the strongest alloy, to OEM specs so you have an easy installation and great performance. These kits come with a crankpin, big end bearing, small end bearing, and washers.
Hot Rods has a Crankshaft Assembly that comes with a Hot Rods connecting rod. Having been manufactured in a factory to OEM specs, these ready to install cranks will give you performance that your OEM parts can’t.
Wiseco has replacement engine parts for your 125, too. They have forged, one-piece pistons that are extremely stronger than your typical cast pistons. The pistons have been made from aerospace-grade alloy, and each top-end piston kit comes with a top-end gasket kit, ring kit, and alloy pin giving you everything you need.
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YAMAHA YZ 125 ENGINE REBUILD KIT CRANKSHAFT, PISTON, GASKETS 2001-2004
$259.00 on eBay -
WISECO Top & Bottom End YAMAHA YZ125 2005-2019 ENGINE Rebuild Kit Crank Piston
$289.72 on eBay -
YAMAHA YZ 125 ENGINE REBUILD KIT GASKET BEARINGS PISTON CRANKSHAFT 98-00 MOTOR
$249.99 on eBay -
Yamaha YZ125 Athena Big Bore 144cc Engine Cylinder Motor Barrel Jug Head 97-04
$450.00 on eBay -
2002 02-04 YZ125 YZ 125 Engine Bottom End Crank Cases Carter Block Half L/R Side
$180.00 on eBay -
Yamaha YZ125 Cylinder NEW Wiseco Piston Top End Engine Kit YZ 125 Jug New Bore
$399.95 on eBay -
Wiseco Top & Bottom End Yamaha 2001 YZ 125 Engine Rebuild Kit Crankshaft/Piston
$340.85 on eBay -
2002 02-04 YZ125 YZ 125 Cylinder Jug Barrel Engine Top End Exhaust Power Valves
$309.99 on eBay -
2000 Yamaha Yz125 Left Right Engine Motor Crankcase Crank Cases Set
$179.00 on eBay -
Wiseco Garage Buddy Engine Rebuild Kit - Yamaha 05-18 YZ125 54mm
$381.95 on eBay