Here’s A Headline That’s Not Exactly News… Today’s Engines Are Getting Bigger and Bigger!

100, 107, 113, 120, 131, 139 cubic inches – these engines are common in bikes today. One thing is for sure – these ‘Big’ Engines can’t live up to their potential with a production carburetor that was designed for a ‘small’ engine. Our reputation has been built partly by our ability to tune engines to their maximum potential; along the way we developed many carburetors with unique alterations for specific engine sizes and applications.

Your special engine can now benefit from our carburetor expertise. We developed the kits listed below to fit the more popular engine combinations currently available. You can purchase a ‘carburetor only’ with jets to upgrade your existing system, or a complete kit supplied with Zipper’s High Flow air cleaner (round style), mounting hardware and jets. Kits are not supplied with manifolds (order separately) unless noted. We stock a large variety of manifolds for different engine sizes, see manifold section for your application

2-1/16” Shorty ‘G’ Series Carbs: Modified in 3 stages: G1, G2 and G3

These Zipper’s-modified ‘G’ series carbs are popular for performance engines with fuel delivery requirements unlike a stock engine. High compression, long duration camshafts, big-flow heads and exhausts extend the usable RPM range of a performance engine, requiring carburetion that provides more flexibility in tuning. We’ve applied what we’ve learned from our years at the race track and on the dyno to the popular ‘G’ series carbs and feel the selection below will help you get the most power and adjustability for your application. Kits include Zipper’s High Flow air filter assembly with adjustable support brackets to accommodate engines with various cylinder heights – high performance with high value!

G1: Best used on 88” – 103” engines. Includes installation of a high volume ThunderProThunderJet, adjustable main jet air bleed and external bowl vent machining. These are the same modifications performed on the ‘G’ carbs supplied in kits offered on page 1.15.

G2: Use on 105” – 120” engines w/ported heads and performance exhaust. Includes all of above; also, venturi is enlarged to alter signal pulses; reducing over-fueling from main jet circuit associated with larger displacements.

G3: Use on 116” – 131” engines with ported heads and performance exhaust. All circuits are recalibrated for improved drivability with engines of these displacements. These alterations provide smooth transitions within all circuits, with great throttle response and overall performance.

No manifold supplied unless noted. Please specify engine size (bore and stroke) when ordering.

Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

Weight 1 lbs

Emissions Compliant

Country of Origin

Fuel / Air

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