120 Stage Engines

120 STAGE I ENGINE:

Best bang for the buck. If lots of low end torque and long life are what you’re looking for, this is the engine for you. Great for heavy bikes and light bikes with tall gears. Fits all stock and aftermarket frames.

BORE (in): X STROKE (in):             4.25” x 4.25”
 DISPLACEMENT:                            120 CI / 1976 CC
 COMPRESSION:                             9:8:1
 PISTON TYPE:                                 FORGED – FLAT TOP
 VALVE SIZE:                                    1.940 INT / 1.610 EX
 CAM:                                                MP 72 – 0.600” LIFT / 264◦ DURATION
 H/P @REAR WHEEL:                     110 HP
 TORQUE @REAR WHEEL:            125 FT. LBS.

120 STAGE II ENGINE:

With its ported heads and higher lift camshaft, this smooth and powerful stage II engine provides increased horsepower and torque and is a great performer for long trips.  Fits all stock and aftermarket frames.
 
 BORE (in): X STROKE (in):             4.25” x 4.25”
 DISPLACEMENT:                            120 CI / 1976 CC
 COMPRESSION:                             9:8:1
 PISTON TYPE:                                 FORGED – FLAT TOP
 VALVE SIZE:                                    1.940 INT / 1.610 EX
 CAM:                                                MP 72 – 0.600” LIFT / 264◦ DURATION
 H/P @REAR WHEEL:                     117 HP
 TORQUE @REAR WHEEL:            130 FT. LBS.

120 STAGE III ENGINE:

Our stage III option is a true high performance upgrade. It includes ported heads, increased intake and exhaust valve sizes, high lift camshaft and increased compression ratio.  With this increase in horsepower and torque, we recommend a switch to heavy duty drivetrain parts.

BORE (in): X STROKE (in):             4.25” x 4.25”
 DISPLACEMENT:                            120 CI / 1976 CC
 COMPRESSION:                             10:5:1
 PISTON TYPE:                                 FORGED – FLAT TOP
 VALVE SIZE:                                    2.020 INT / 1.610 EX
 CAM:                                                MP 58 – 0.6516” LIFT / 256◦ DURATION
 H/P @REAR WHEEL:                     125 HP
 TORQUE @REAR WHEEL:            135 FT. LBS.