40cc Kids Dirt Bike brought by XPROUSA. Recommended for small kid. 【The 4-stroke engines which are more reliable and durable than the 2-stroke engines.】X-PRO kids dirt bike has an engine with 40cc fully automatic chain drive transmission system provide your kids with plenty of muscle through the trails all day with a max speed of 22 mph. 【Whole bike is EPA approved】it means the kid's dirt bike will not cause unreasonable adverse effects on users’ health under the instruction manual, and it’s environmentally friendly, while it has low noise, no need for mixing. 【Easy & Smooth,Great for a beginner and small children】 the smaller engine offers a smooth and steady acceleration that won't be too fast or too mach to handle for your small child.