NStreet 34mm VM34 Universal 2-Stroke Carburetor for Polaris 250–400 (Cable Choke, OEM-Fit)

The NStreet 34mm VM34 cable-choke carburetor is a universal aftermarket replacement designed to restore fuel delivery and throttle response on a wide range of Polaris 250–400 ATVs from the 1990–2006 era.

If your Polaris is running rough, hesitating, or leaking fuel because of a worn or damaged OEM carburetor, this NStreet unit is built to match VM34 dimensions and many common OEM part numbers. It fits numerous Trail Blazer, Trail Boss, Xplorer, Xpress, Big Boss, Sport and Scrambler models and comes with the 34mm intake bore, cable choke configuration and standard mounting sizes that simplify swaps on compatible machines.

Which Polaris models will this carburetor fit?

This carburetor is specified for many Polaris 250–400 models across the 1990–2006 range. Before buying, compare the physical shape and measurements to your OEM part since some installations require minor modifications or professional fitting.

• Common fits: Trail Blazer 250, Trail Boss 250/350L, Xplorer 250/300/400, Xpress 300/400, Big Boss 300/400L, Sport/Scrambler 400.
• Check years listed for each model to confirm compatibility.
• Cross-references include OEM numbers like 3130424, 3130498, 3130710 and others.
• Recommended: verify intake bore and mounting pattern match your machine.

How does the 34mm VM34 design affect performance?

The 34mm bore controls airflow and fuel atomization appropriate for small-to-mid displacement Polaris engines. Proper sizing helps maintain throttle response, steady idling and predictable midrange power without over-venting or bogging.

• 34mm intake inner diameter, 40mm outer diameter for the intake mouth.
• Air filter mount inner diameter 44mm, outer 47mm — matches many stock filters.
• Cable choke for easier cold starts with standard lever routing.
• Tuned for OEM-style jetting; may need re-jetting when used with modified engines.

What should I expect during installation and setup?

Installation is straightforward on machines with matching mounting geometry but can require small adjustments on some chasses. Hoses, throttle cables and intake boots should be checked for fit; professional installation is suggested if you're unsure.

• Inspect throttle cable routing and choke cable clearance before mounting.
• Verify gasket sealing surfaces and use new clamps for intake boots.
• Some models may need slight modification or different jets; keep spare gaskets and jets handy.
• Test for vacuum leaks and adjust idle/mixture after installation.

How durable and serviceable is this aftermarket replacement?

NStreet builds this carburetor to be a cost-effective alternative to aging OEM units, with standard components that can be cleaned or serviced using common carburetor kits. Regular maintenance will prolong life and maintain reliable operation.

• Serviceable float bowl and removable jets for cleaning and tuning.
• Compatible with common rebuild kits and replacement gaskets.
• Not a direct OEM part in every case — treat as aftermarket; check fit first.
• Professional installation recommended for complex or modified setups.

Who is this for: Riders and mechanics who need an economical, VM34-pattern replacement for worn or damaged carburetors on Polaris ATVs from the 1990s to mid-2000s. It’s intended for owners comfortable verifying fitment and performing basic installation or those who will have a trusted technician fit and tune the carburetor to their specific engine and intake setup. If you have a heavily modified engine or are unsure about physical fit, check measurements and consult a mechanic before purchase.