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Load image into Gallery viewer, ARC 6603-H3 Billet Flywheel
Cyber Sale

6603-H3 ARC Flywheel, Billet, Small Diameter, Finless, GX390, 420 Predator

  • $145.00
  • $185.00
Coil Bracket
Parts | Stock | Hotrod | Flywheel
Fits GX340s, GX390s, 420cc Predators, and 460 OHVs
  • No fins for methanol applications
  • SFI-certified billet aluminum
  • 14 degrees of adjustable timing with ARC's signature adjustable timing hub
  • Small 5 3/4" diameter and light 2.85lb weight for quick revving and faster acceleration
  • Powerful rare-earth magnet
Due to its small diameter, this flywheel will accelerate faster than the standard diameter flywheels and even those weighing less than this one. This is the flywheel for those who want to get out of the hole or corners quickly!

Note: Coil bracket required! Not included unless specified. For use with hand held starters (extended nut recommended). Will not work with stock recoil.

Flywheel Selection Guide>

WARNING: No returns on flywheels that have been removed from packaging. Be sure to know what type of motor you have.
FAQ Accordion with Animation

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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