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Cylinder -POLINI aluminum 152ccm (Ø60mm) Evolution membrane (54mm stroke) - Vespa PV125, ET3 125, PK125 - crankshaft P2100070 is required

Polini BIG EVO racing cylinder Polini 152cc for Vespa Smallframe PV125/PK125

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Big Evo racing cylinder POLINI Alu 152ccm / Evolution membrane Vespa Smallframe

The new Polini BIG EVO! Here we have the classic one 133 Polini racing cylinder presented. If that's not enough for you, there is now one Polini BIG EVO for the Vespa Smallframe. This modern racing cylinder means full 152 tsp for the original series engine housing the Vespa Smallframe-Models such as V50, 50N, PV, ET3, PK etc. So you don't need an extra motor housing!

30HP + tuning set for original engines

With a Ø60mm bore and 54mm stroke, as well as very ambitious control angles straight out of the box, the Polini is a serious opponent for the racetrack.
Based on the very successful Polini EVO 133, Polini has put together a great package that is designed for performance above the 30HP was created!

Polini Big Evo 152 Vespa

Data of the Vespa Polini tuning kit

  • Bore: Ø60mm
  • Hub: 54mm
  • Displacement: 152cc
  • Crush dimension: 1 ± 0,1mm
  • Connecting rod length: 105mm
  • Verdichtungsverhältnis: 14,2: 1
  • Piston running play: 0,07 - 0,08mm
  • Outlet shape: two-part
  • Outlet angle: 194 °
  • Overcurrent angle: 130 °
  • Preignition: 20 °
  • Spindle dimension left crankcase: Ø89,5 x 22,4mm
  • Spindle dimension right crankcase: Ø89,5 x 15,8mm
Buy Polini 152cc cylinder here
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Polini Big Evo 152 VespaPolini Big Evo 152 Vespa
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INTAKE FITTING

The Polini kit contains the complete intake tract, consisting of:

large membrane inlet, intake manifold and connecting rubber. The 6-flap membrane is equipped with 0.4mm thick plate material. The intake manifold is intended for use with a Ø34mm carburetor cross section (carburetor connection width of the rubber is Ø44-45mm). Modifications in the area of ​​the frame cutout for the carburetor may be necessary.

PISTON

The Polini tuning set for Vespa relies on the well-known Asso piston of the Polini Aprilia AF1 kits, like the ones from FALC Racing is used in its 153cc cylinder (we can offer the very high-quality Ø60mm Wössner piston from Overrev very much).

CRANKSHAFT

Any shaft with a stroke of 54mm and a connecting rod length of 105mm can be used as the crankshaft.
The connecting rod length not only benefits the better connecting rod ratio, but also reduces the necessary housing adjustments for the overcurrent channels to a minimum.

SPINDLES

The motor housing must be spindled with a 54mm stroke for the required crankshaft.

CYLINDER HEAD

In addition to the conventional screw connection, the cylinder head is screwed onto the continuous (longer, enclosed) cylinder stud bolts with 4 screws.

 

Recommended accessories / setup:

  • Crankshaft: P2100070 or comparable (54 / 105mm)
  • Exhaust system: P2000416 or similar
  • Ignition: P1710554 or similar
  • Dynamic ignition timing (with ignition P1710554): 4,8mm in front of the upper one
  • Piston dead center at 4500 rpm
  • Spark plug: NGK BR9EG or comparable

CONCLUSION:

Very interesting alternative for normal engine cases to the often unavailable FALC Racing cylinder. If you are looking for performance in the range well above 25PS, you will find it here!

Buy Polini 152cc cylinder here

 

Installation instructions Polini racing cylinder

Polini-BigEvo-152-racing-cylinder-PI776

Fits on the following Vespa Smallframe:

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Project Racer - Tuesday 07.02.2012/XNUMX/XNUMX

Milling cylinders and engine housings is on the agenda today.

The Polini Evo can be expanded significantly in the area of ​​the overflow channels, as the channels for housings are made with a small cylinder base sealing surface.
Our CNC housing has enough meat to open the overcurrent channels to their full size.

Space must be created here for the cylinder base.

Marking out the overcurrent ducts.

Rough trimming.

... and nicely done.

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