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Suzuki RM125 Big Bore Kits/Big Bore Stroker Kits






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*Please be sure to clean out your crankcases before installing your big bore top end. There may be foreign material still inside from a prior top end failure, which will quickly ruin your new big bore kit. Also check your crankshaft to make sure your lower end bearing is not ready to fail. If you need us to check it for you, then send your entire engine to us when purchasing our big bore kit service.
 134cc Big Bore Kit Service  Send us your cylinder, power valve, and head. Includes: Bore Cylinder and Re-Plate, Head Modification for bigger bore, Big Bore Porting, any Power Valve Modification needed, 56mm Piston Kit, Top End Gasket Kit, and Return Shipping.
*Crankcases are needed with your cylinder and head for this kit. Clearance mod needs to be made to crankcase for bigger bore. You can send complete engine if your not comfortable or not able to disassemble bottom end. We can also check your crankshaft/connecting rod while it is here.
Price $515.00   For 1990-08 RM125 

 139cc Big Bore Kit Service  Send us your cylinder, power valve, and head. Includes: Bore Cylinder and Re-Plate, Head Modification for bigger bore, Big Bore Porting, any Power Valve Modification needed, 57mm Piston Kit, Top End Gasket Kit, and Return Shipping.
*Crankcases are needed with your cylinder and head for this kit. Clearance mod needs to be made to crankcase for bigger bore. You can send complete engine if your not comfortable or not able to disassemble bottom end. We can also check your crankshaft/connecting rod while it is here.
Price $515.00   For 1992-08 RM125 

144cc Big Bore Kit Service  Send us your cylinder, power valve, and head. Includes: Bore Cylinder to 58mm and Re-Plate, Head Modification for 58mm bore, Big Bore Porting, any Power Valve Modification needed, 58mm Piston Kit, Top End Gasket Kit, and Return Shipping.
*Crankcases are needed with your cylinder and head for this kit. Clearance mod needs to be made to crankcase for bigger bore. You can send complete engine if your not comfortable or not able to disassemble bottom end. We can also check your crankshaft/connecting rod while it is here.
Price $515.00   For 1992-03 RM125 

144cc Big Bore-Stroker Kit  (56mm Bore X 58.5mm Stroke). Send your complete engine with kickstarter and shifter to us. Includes:  Calculate Deck Height, Port Heights, Compression Ratio, Bore Cylinder, and Re-Plate, Head Modification for Big Bore/Longer Stroke, any Power Valve Modification needed, Big Bore Porting, 56mm Piston Kit, 4mm Stroker Crank Modification, and Rebuild, Connecting Rod Kit, Complete Gasket Kit, Engine Seals, Crank Bearings, Crankcase Modification for Longer Stroke, Complete Engine Rebuild Labor, Return Shipping.
Price $1630.00   For 1990-08 RM125 
*Same Bore and Stroke as KTM 144/150SX


149cc Big Bore-Stroker Kit  (57mm Bore X 58.5mm Stroke). Send your complete engine with kickstarter and shifter to us. Includes:  Calculate Deck Height, Port Heights, Compression Ratio, Bore Cylinder, and Re-Plate, Head Modification for Big Bore/Longer Stroke, any Power Valve Modification needed, Big Bore Porting, 57mm Piston Kit, 4mm Stroker Crank Modification, and Rebuild, Connecting Rod Kit, Complete Gasket Kit, Engine Seals, Crank Bearings, Crankcase Modification for Longer Stroke, Complete Engine Rebuild Labor, Return Shipping.
Price $1630.00   For 1992-08 RM125 

155cc Big Bore-Stroker Kit  (58mm Bore X 58.5mm Stroke). Send your complete engine with kickstarter and shifter to us. Includes:  Calculate Deck Height, Port Heights, Compression Ratio, Bore Cylinder, and Re-Plate, Head Modification for Big Bore/Longer Stroke, any Power Valve Modification needed, Big Bore Porting, 58mm Piston Kit, 4mm Stroker Crank Modification, and Rebuild, Connecting Rod Kit, Complete Gasket Kit, Engine Seals, Crank Bearings, Crankcase Modification for Longer Stroke, Complete Engine Rebuild Labor, Return Shipping.
Price $1630.00   For 1992-03 RM125 

Notes: Prices shown are to install Big Bore/stroker Kit in good condition engine. Should your engine need rebuild parts there will be additional
charges. We will call for approval before we install any parts that will have additional charges. (example: Transmission Parts, Clutch Parts,
Bearings other than Main Bearings)
  134cc Big Bore Parts Kit Only  Wiseco 56mm Piston Kit #755M05600, Top End Gasket Kit, and Top End Bearing.
Price $209.00   For 1990-03 RM125 

  134cc Big Bore Parts Kit Only  Wiseco 56mm Piston Kit #836M05600, Top End Gasket Kit, and Top End Bearing.
Price $197.00   For 2004-08 RM125 

  134cc Big Bore Parts Kit Only  Wossner 56mm Piston Kit #8055D200, Top End Gasket Kit, and Top End Bearing.
Price $141.00   For 1990-99 RM125 

134cc Big Bore Parts Kit Only  Wossner 56mm Piston Kit #8061D200, Top End Gasket Kit, and Top End Bearing.
Price $141.00   For 2000-03 RM125  
 

134cc Big Bore Parts Kit Only  Wossner 56mm Piston Kit #8098D200, Top End Gasket Kit, and Top End Bearing.
Price $141.00   For 2004-08 RM125
  

144cc Big Bore Parts Kit Only Wiseco 58mm Piston Kit #836M05800, Top End Gasket Kit, and Top End Bearing.
Price $197.00   For 1992-03 RM125