LTZ-400
Athena 440cc Big Bore Kit
LTZ400 '03-up- Includes aluminum cylinder, piston kit, and special gasket set designed for larger water jackets
- Bolts on with no machining required
- 94mm big bore piston
- Aluminum cylinder designed with wider water jackets for better cooling.
- Forged hi-compression piston
- Includes all necessary Rings, Clips, and Gaskets.
Hotcams Performance Camshaft
More power and torque through the entire rpm range.

Manual Cam Chain Tensioner
LT-Z400 allSolid reliability and easy installation. Bling factor too! This manual tensioner is a good upgrade for any modified motor, especially if it is ridden hard. A new gasket is included.
K&N Air Filter
- Increased air flow over the stock air filter
- Designed to increase horsepower and throttle response
- Designed to fit inside the factory air box
- Larger surface area over foam filters which offers longer service intervals in dusty conditions
- Four layers of premium cotton gauze provides outstanding filtration
- Washable & re-usable, never wears out
- One filter will last the lifetime of your bike
Powernow
Bolts onto the carburetor intake.
Highly recommended for trail-riding use. Improves power delivery at smaller throttle openings, smoothing out throttle response for a more controllable ride.
ATV Power-Up Kit
- Includes jet kit, K&N air filter, pre-filter, K&N service kit, and instructions
- 10%-15% power increase
- Improved throttle response
Shorai Power Lithium-Iron Battery
LTZ400 '03-up- No more dead batteries. Holds charge for one year without maintenance
- Two to four times the life of lead-acid batteries
- Carbon Fiber Composite Case
- Faster cranking for better starts
- Environmentally friendly, just discharge and dispose
- Ultra light and compact - You could easily carry a spare!
For each motorcycle shown Shorai often, but not always, has three battery options. The first is the Standard Recommendation, second is the Race Recommendation and third is the Duration Recommendation. See below for the explanation of each of these recommendations, sample pricing and weight comparisons against the Yuasa YTZ10S that is standard in many CBR's.
- The Standard recommendation is the best overall pick for most applications, and has been selected to give strong cranking performance and long lifespan. For comparison sake, the LFX9A1 is 5.65 lbs. lighter than the lead-acid Yuasa YTZ10S and is ProCycle priced at $124.95.
- The Duration recommendation is for those who want the strongest possible cranking performance and lifespan, and don’t mind a slight increase in weight and cost compared to the Standard recommendation. Users with extra electrical accessories - like stereo systems used regularly when the vehicle isn’t running - may also choose the duration suggestion. The LFX 14A1 battery is 5.32 lbs. lighter than the YTZ10S and ProCycle priced at only $149.95
Shorai Charger
You can charge your Shorai battery with a regular battery charger but if you want the very best for it, this charger is designed for optimum performance by balancing the individual cells in the battery. Balanced charging ensures the battery reaches its fullest capacity and longest life. 'Store' mode allows long term long term mainenance storage.
Shorai Charge/Store Dedicated Battery Management System for Shorai LFX only. 2A Max charge rate, connects via BMS 5-pin port on LFX batteries. Includes modes for full charge, or long-term storage. Input USA 110~120V 50/60 Hz.
For Shorai Lithium Iron batteries only
Vapor Speedometer / Tachometer
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