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Stage6 Crankshaft HPC CPI

Stage6 Item no.: S6-8019500

Stage6 Crankshaft HPC CPI

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Data Sheet
Suitable for (32)


Stage6 HPC Crankshaft CPI, HPC (High Primary Compression) crankshaft for 12mm piston pin.

HQ full-circle crankshaft for higher primary compression in the crankcase. It is entirely made of hardened steel, with reinforced connecting rod. Stage6 opted for a full-circle design instead of the standard design with inserts; this way the crankshaft has greater rotational inertia at high rpm. 16mm shaft (variator side), compatible with big variators (by Stage6, Polini, Malossi, etc.).

 It is suitable for 50cc and 70cc sports, racing and even "Hyper Racing" engines. 

Also included are an oil pump gear and a special variator nut.


- As it comes with a bigger nut, this crankshaft cannot be used with inner rotor ignitions by Polini or MVT.
- Variator-side shaft is 16mm.

Data Sheet

Name Stage6 Crankshaft HPC CPI
Item No. S6-8019500
Brand Stage6
Product Line Racing
Stroke Original
Conrod Length Standard
Piston Pin 12 mm

Your product goes with the following manufacturers and their models:

Adly (Her Chee)

AirTech 50cc

Blizzard GTA 50cc

Cat 50cc

Jet 50cc

Noble 50cc

Panther 50cc

Silver Fox 50cc

Super Sonic 50cc

TB 50cc AC

Thunderbike 50cc


BT50QT-28B 2-stroke


Aragon 50cc

Aragon GP 50cc

Bravo 50cc

Formular R 50cc

Freaky 50cc

GTR 50cc LC - Minarelli horiz.

Hussar 50cc AC (after 2003) - Min horiz. (pin 12mm)

Oliver 50cc AC (after 2003) - Min horiz. (pin 12mm)

Popcorn 50c AC (after 2003) - Min horiz. (pin 12mm)


Cracker 50cc

Ideo 50cc AC

Race 50cc 2-stroke

Roc 50cc

Spin GE 50cc

Stroke 50cc

XOR 50cc AC


Florett 50cc AC

Flory 50cc AC


F10 Wap 50cc AC (after 2004)

F12 Phantom 50cc AC (after 2004)

F12 Phantom 50cc LC (after 2004)

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