There are 2 different Wiseco pistons made to convert a 125 to an AMA Legal 144cc engine. The Wiseco 830MO5800 is designed for the 2003-07 KTM125 and 2004-07 Suzuki RM125. The 9316MO5801 is Eric Gorr's Wiseco custom piston and it fits 8 brands of dirt bikes and nearly 100 models dating from 1989. Additionally Eric's custom Wiseco fits bikes outfitted with a similar piston sold through Forward Motion and dealers since 1992, and Max Power/RPM since 1997. So if you have an old bike with a big bore, Eric's piston probably fits it.

Free evaluations of old cylinders and pistons can be sent to Nickel-Composite
Atn. Eric
815 Walsh Rd
Madison, WI. 53714

Comprehensive listing for Eric Gorr's Big Bore 144 Piston & Gaskets

Honda CR125 1989-1999, 2005-07
Kawasaki KX125 1994-2007
Suzuki RM125 1990-2003
Yamaha YZ125 1994-2007
GasGas 125 MX,XC 2002-2007
Husqvarna CR/WR125 2000-2007
KTM125 SX/EXC 2001-2005

IC Shifter Kart Engines; Vortex, Rotax, Pavesi

144 Piston Kit
Price: $85

144 Spare ring
Price: $12

144 Piston and gasket kit
Price:$105

Type Year, Make, and Model

Wiseco 58mm Piston & Gasket Kits

KTM125 SX/EXC 2001-07
Price: $125

Suzuki RM125 2004-07

Price: $125

Supermini Piston & Gasket Kits

Honda CR80/85 1986-2006 766MO5200
Price: $105

Suzuki RM85 2002-2006 806MO5200
Price: $105

Yamaha YZ80/85 1993-2006 767MO5250
Price: $105

Honda and Suzuki spare ring
Price: $12

Yamaha spare ring
Price: $12

Call or email to order if you don't have a Paypal account and you want to use a Visa/Mastercard. Sorry no UPS C.O.D. or Discover/Amex

 

Telephone Orders Call 1-630-825-5645
Email: ericgorr@hotmail.com