Polini 63mm Cylinder Kit for Vespa PX

$352.00

Polini 63mm (177cc) Cast Iron Sport Cylinder Kit for Vespa PX, Genuine Stella and LML Star 2-Stroke Scooters. Kit includes cylinder, cylinder head, piston, rings, piston pin, cir clips, and gaskets. Cast iron cylinder and double ring piston for longevity.

When you use this Polini 63mm Big Bore Kit in conjunction with your stock crankshaft you will increase your total displacement to 177cc! The manufacturer claims 15.5bhp at 7,600RPM is possible with this kit. Please note: the bottom two fins of the cylinder will need to be modified if this kit is used with an electric starter.

*You may need to modify your engine case to accommodate the larger cylinder.

Upgrades to 177cc
Cylinder Bore: 63mm

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Frequently Asked Questions

When will my order be shipped and how long does delivery take?

Orders containing in-stock items typically ship within 3–5 business days. Orders that include assembly will require 7–10 business days to prepare. Please note that during the holiday season (Thanksgiving through Christmas), processing times may be longer due to high order volume. Once your order has shipped, you’ll receive an email with tracking information. Most orders are shipped via Less Than Truckload (LTL) freight and generally arrive within 3–7 business days. Deliveries to remote areas (such as mountains, forests, valleys, or islands) may take longer. You can check the estimated delivery date on the carrier’s website using the tracking number we provide.

How your vehicle is shipped?

Unless otherwise noted, the vehicles we offer are shipped crated or on a pallet and do not come assembled unless you’ve selected our assembly service. Assembly typically requires a few basic tools and mechanical knowledge. If you're not confident in your ability to safely assemble a high-speed off-road vehicle, we strongly recommend selecting professional assembly or having it assembled by a local mechanic.

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Do you offer financing?

Yes. Buy-now-pay-later financing is available with our preferred partner, BreadPay® (please see their icon under product pricing for details).

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How can I get assistance if I have question on products?

Please call 888-886-5846 and talk to one of our knowledgeable sales representatives between 9am-3pm PST. Or send us email at orders@gokartsusa.biz.

What warranty is included with my purchase?

You're covered with confidence at GoKarts USA®. Your satisfaction is our top priority. Every purchase comes with manufacturer-backed warranty protection—including up to 12 months of engine coverage—to keep your ride running strong. TrailMaster products also include a 6-month parts warranty for added peace of mind.

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What does 95% or 98% Assembly Mean? What do I need to assemble if shipped in crate?

For shipping safety, most vehicles cannot be fully assembled prior to delivery.

Minor assembly is required—this typically includes installing mirrors, connecting the battery, adjusting handlebars, and other small components. Before operation, please ensure all screws and fasteners are tightened, engine fluids are at proper levels, and the battery is fully charged. Your factory warranty remains valid right out of the box.

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Polini 63mm Cylinder Kit for Vespa PX

Frequently Asked Questions

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