Intake Manifold POLINI 25mm,
for BSV GP,
inner diameter: 25mm,
with big reed valve
Basically, manifolds are responsible for the fl ow of the gas-air mixture to your carburetor. Your original manifold‘s fl ow channel is usually smaller than your carburetor - creating a throttle effect, resulting in a hearty power reduction. A tuning manifold corrects this imbalance with a larger diameter, giving you more fl ow and more power - even with your original carburetor. Installing a tuning carburetor without an open manifold doesn‘t make sense.
All open manifolds have two things in common: an optimized diameter as well as a shorter and better induction path. Irregardless which sport manifold you choose, your scooter will reward you with a remarkably higher performance. Get some fresh air in your system!
For those who want it big, we recommend the POLINI BIG VALVE. BIG VALVE manifolds are available for 21 - 25mm carburetors. Ideal if you‘ve already built in a larger carburetor or if you are not satisfi ed with 21mm‘s. The same power performance is achieved in all rpm ranges. Manifold is delivered with reed valve block and gaskets. BIG VALVE is recommended by all leading scooter doc‘s! Don‘t forget to order a bigger main jet.
SIP-TIP! Big Valve reed valve blocks have big needs - which means you‘ll have to exchange your original air fi lter for a racing air fi lter system.
OEM Numbers (for the purpose of comparison)
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