Displacement
125cc
Class Profile
KZ (formerly ICC/KF1) Shifter Kart
Shifter kart international class from Various (IAME, Vortex, TM, others).
Top Speed
100+ mph
Power
40+ HP
Difficulty
Expert only
Budget Startup
$19,500-25,200
Engine Specs
Cylinder Count
1
Stroke Type
2-stroke
Cooling System
Water-cooled
Horsepower
40+ HP
Torque
High torque with 6-speed transmission
Max R P M
Very high RPM capability
Fuel System
High-performance carburetor system
Ignition
Advanced ignition timing
Transmission
6-speed sequential gearbox
Performance Overview
Top Speed
100+ mph
Acceleration
Exceptional - motorcycle-like acceleration
Laptime Vs X30
5-8 seconds faster per minute
Difficulty Level
Expert only
Cost Breakdown
New Engine
$8,000-12,000
Used Engine
$5,000-8,000
Maintenance Cost
Extremely high
Seasonal Maintenance
$2,000-3,500
Rebuild Interval
8-15 hours
Rebuild Cost
$1,500-2,500
Fuel Consumption
High - race fuel requirements
Budget Setup
Chassis: $6,000-8,000 (used shifter chassis)
Engine: $8,000-10,000 (rebuilt KZ engine)
Safety gear: $2,500-3,200 (premium shifter gear)
Accessories: $3,000-4,000 (specialized shifter tools/spares)
Total: $19,500-25,200
Competitive Setup
Chassis: $6,200-6,800 (new shifter chassis)
Engine: $10,000-12,000 (new KZ engine package)
Safety gear: $3,200-4,000 (top-tier shifter gear)
Accessories: $4,000-6,000 (data, spare engine, pro tools)
Total: $23,400-28,800
Recommended Brands
TonyKart Krypton 401KZ
$6,200-6,800
Most successful KZ chassis globally, world championship proven
View brand profileCRG Road Rebel KZ
$5,800-6,400
Strong European KZ heritage, proven performance
View brand profileBirelART CRY30-S14/CRY32-S14
$6,000-6,600
Latest shifter technology, F1 team development
View brand profileWhere To Race
Sanctioning Bodies
- • CIK-FIA
- • SKUSA
- • WKA
- • International series
Popular Series
- • CIK-FIA KZ World Championships
- • SKUSA SuperNationals KZ/KZ2
- • European KZ Championships
- • Selected WKA events
- • International karting competitions
Track Availability
Limited - specialized venues only
Competition Level
Professional/world championship
Field Sizes
Smaller but extremely competitive fields
Pros
- • Ultimate karting performance experience
- • Direct path to professional motorsports
- • World championship competition available
- • Motorcycle-level acceleration and speed
- • 6-speed transmission driving experience
- • Prestige and recognition in karting community
Cons
- • Extremely expensive to purchase and maintain
- • Requires professional-level expertise
- • Very limited racing opportunities in USA
- • Constant rebuild requirements
- • High physical and mental demands
- • Significant safety risks
- • Complex setup and tuning requirements