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Shaft Mounted 1.1:1 Ratio Rocker Arms for GX390, 420 OHV, and 460cc

$21.00
$25.99

Shaft Mounted 1.1:1 Ratio Rocker Arms for GX390, 420 OHV, and 460cc

These are the famous "Champion" HD shaft rockers for GX390 and 420 OHV engines. They are arguably the best bang for your buck when it comes to valve train stability.
A shaft rocker eliminates the need for a guide plate and prevents the rocker arms from walking side to side. Further, they have considerably more rigidity than stud rockers, so they rarely need adjustment once set.
Studs and nuts included (Studs may require tools to install - too tight to turn by hand.)
Fits GX390 and 420 OHV engines. Will not fit GX270s.

*Note: These rockers are not a set-and-forget upgrade. They require some knowledge of engines and valvetrain geometry to work properly. We cannot provide installation support due to the immense amount of variables between different makes of engines!

As with any other aftermarket part, additional modifications may be necessary to fully utilize this component (e.g. longer pushrods, clearance of valve cover). Do not assume this is a drop-in part or that you don't have to check for fit or proper operation.

Rockers are designed as 1.1 to 1, but due to manufacturing and stamping tolerance, they may vary some.

Does not fit hemi style cylinder heads. Verify that you do not have a hemi head before purchasing as we do not allow returns on this item.*

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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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Shaft Mounted 1.1:1 Ratio Rocker Arms for GX390, 420 OHV, and 460cc

Frequently Asked Questions

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