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2-stroke engines are lighter, more powerful for their size, and simpler in design, but require oil mixed with fuel and produce more emissions. 4-stroke engines are cleaner, more fuel-efficient, and quieter, but are heavier and more complex. For recreational use and maximum power-to-weight ratio, 2-stroke kits are popular. For daily commuting and longer rides, 4-stroke engines offer better reliability and efficiency.

Speed depends on several factors including engine size, bicycle weight, rider weight, terrain, and wind conditions. Typically, a 49cc kit will reach 25-30 km/h, an 80cc kit will reach 35-45 km/h, and a 100cc kit can exceed 45-55 km/h on flat terrain. Performance upgrades like high-compression heads and expansion chambers can further increase top speeds.

Yes, our fat tire bike engine kits are specifically designed to accommodate the wider frames and unique geometry of fat tire bicycles. These kits include longer mounting hardware and modified drive systems to ensure proper fit and function. We recommend our specialized fat tire mounting kit for optimal results.

Yes, we offer disc brake conversion kits as an optional upgrade for all our motorized bicycle kits. These conversions significantly improve stopping power, which is especially important at higher speeds. Our disc brake kits include all necessary components including calipers, rotors, mounting brackets, and brake levers with engine cut-off switches.

Fuel consumption varies by engine type and riding conditions. On average, 2-stroke engines consume 2-3 liters per 100km, while 4-stroke engines are more efficient at 1.5-2.5 liters per 100km. Most of our kits include a 2-3 liter fuel tank, providing a range of 60-150km depending on the engine type and riding conditions.

Regular maintenance includes checking and tightening all fasteners, adjusting the chain tension, cleaning the air filter, and checking the spark plug. 2-stroke engines require proper oil/fuel mixing (typically 25:1 ratio), while 4-stroke engines need periodic oil changes (every 500-1000km). We recommend a complete inspection every 500km to ensure optimal performance and safety.

Regulations vary by location. In Australia, most states allow motorized bicycles with engines under 50cc and a top speed not exceeding 25 km/h without requiring registration or a motorcycle license. However, laws vary significantly between states and countries. We recommend checking your local regulations before operating your motorized bicycle on public roads.

Beach cruisers, mountain bikes, and hybrid bicycles with sturdy steel frames work best for motorized conversion. The bicycle should have a standard diamond frame with enough space in the center triangle to mount the engine. Bikes with front suspension are ideal as they help absorb vibration. We don't recommend installing kits on carbon fiber frames, folding bikes, or bicycles with non-standard geometry.

Most installations can be completed with basic tools including wrenches, screwdrivers, pliers, and Allen keys. Some specific steps may require a chain breaker tool and basic measuring tools. Each kit comes with comprehensive installation instructions, and our customer support team is available to assist with any technical questions during installation.

All OZ Bike Engines motorized bicycle kits come with a 6-month warranty covering manufacturing defects in materials and workmanship. This warranty excludes damage from improper installation, misuse, or normal wear and tear. We also offer a 30-day satisfaction guarantee, allowing you to return unused kits in original packaging for a full refund if you're not completely satisfied.