Polini Reed Valve "Big Valve" Yamaha BW's / Slider / MBK

Polini Item no.: P215.0410

Polini Reed Valve "Big Valve" Yamaha BW's / Slider / MBK



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Data Sheet
Suitable for (33)


Polini Intake Kit "Big Valve" 17.5 / 21mm MBK Booster / Stunt, HQ 4-petal racing valve for engines with original 2-petal valve.

This reed valve has a large cross section allowing for increased flow area for the fuel-air-mixture. As a result, cylinder filling is improved which in turn leads better engine reponse and performance at mid and high rpm.

The kit includes:

- reed valve Evolution with carbon fiber reed petals
- aluminium mount for reed block
- rubber intake manifold 17.5mm / 21mm (type Dell'Orto)

Particularly suited for racing and "Hyper Racing" cylinders.

Data Sheet

Name Polini Reed Valve "Big Valve" Yamaha BW's / Slider / MBK
Item No. P215.0410
Brand Polini
Carburator Type Arreche/Amal, Gurtner, Dell'Orto
Carburator Diameter 21mm
Intake diameter 21mm
Scope of Delivery With intake manifold, With valve
Material Aluminium, Rubber
Valve Material Plastic
Petals Material Carbon
Petal Thickness 0.35 mm

Your product goes with the following manufacturers and their models:

Adly (Her Chee)

Rapido 50cc


Amico 50cc AC (1991 - 1992)

Amico 50cc ac (after 1993)

Amico GL 50cc AC

Amico Sport 50cc AC

SR 50cc AC (before 1994) - Minarelli vertical


Pista 2 50cc AC

Pista 50cc AC

Scoop 50cc


Booster 50cc AC (1992 - 1999)

Booster 50cc AC (after 2004)

Booster Next 50cc AC (after 1999)

Booster Next 50cc AC (before 1999)

Booster One 50cc until 2013

Booster Rocket 50cc AC

Booster Spirit 50cc AC (before 2004)

Booster Track 50cc AC

Stunt 50cc AC

Stunt 50cc AC CAT (after 2004)

Stunt Naked 50cc AC


BW's 50cc AC

BW's 50cc AC (after 2004)

BW's Bump 50cc AC

BW's Easy 50cc 2013

BW's NG 50cc AC (after 1999)

BW's NG 50cc AC (before 1999)

BW's Spy 50cc AC

Slider 50cc AC (before 2004)

Slider 50cc AC CAT (after 2004)

Spy 50cc

Target 50cc

Zuma 50cc AC

Zuma II 50cc AC

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