A minibike , sometimes called a mini moto or pocketbike , is a miniature motorcycle. Most traditional minibikes use a four stroke engine to turn the rear wheel via a chain. Small cheap gasoline engines like ones produced for yard equipment are most often used, though most designs require a horizontal crankshaft engine. This means that typical walk behind mowers, which use vertical crank engines, cannot be used. Some models use a two stroke engine, and DSCF0813electric-powered models are also available. A 2-stroke engine usually creates a louder, higher frequency noise than a typical four-stroke engine, this is because a two-stroke engine has a power stroke, and subsequent exhaust pulse for every rotation of the crankshaft, while a four-stroke has a power stroke, and an exhaust pulse every other rotation of the crankshaft. In effect, two-strokes sound as if they are operating at double the speed of a four-stroke engine. Also, an improperly tuned two-stroke often releases unburnt fuel, and thick blue smoke out exhaust during normal operation, these features, along with a minibike's small size, mean that minibikes are rarely street-legal but are legal on all grassed non privately owned areas.
History
Like go-carts, the first minibikes were made by enthusiasts from spare parts found in their garages. They were first popularly used as "pit bikes", for drag racers to travel around in the pits during races in the late 1950s. They were very useful for this purpose, as they could maneuver very well in the tight pit roads, fit in about the same space as a small bicycle in a trailer or pickup, and they were faster than most previous forms of transportation. As racers brought them home and used them around their neighborhoods, many children liked the idea of having a "mini motorcycle" and started building their own. A market for minibikes developed and many cottage and major industries developed to meet the demand. Famous minibike companies include Arctic-Cat, Rupp, Taco, Heath, Gilson, and Fox, many of which also made other power toys such as go-carts, trikes and choppers. The height of the minibike/go-cart era was from the late 1960s to the early 1970s in America. Many of the famous brands, foremost Rupp, have gained a cult-following of enthusiasts and owners.
These early minibikes usually consisted of a powertrain containing a small fourstroke, horizontal shaft, flathead engine from a lawnmower. The power transmission usually consisted of a crank-mounted centrifugal clutch and chain drive to a rear sprocket. As the minibike and the mini-powersports field grew and expanded, Comet introduced a small variable-ratio belt system (much like a snowmobile's) called the Tourque-a-Verter, which allowed for the better transfer of power from the engine to the rear wheel, resulting in better top speed and acceleration.
Types
Today minibikes have evolved into several specialized types, all around the concept of a mini motorcycle:
Pitbike Racing and Competitions takes the form of Supermoto racing using a form of Pitbike/minibike with a wheel size of 10inch front and rear with supermoto slick tires fitted. The bikes are prepared for racing with precautions such as catch tanks to collect possible fluid spillages being dropped onto the tracks causing possible skidding hazards, to fellow competitors.
Legal status
Netherlands
In the Netherlands, minibikes/mini motors are not allowed on the public road. Doing so will lead to a fine and possibility of confiscation, but it is more likely that only a warning will be given, followed by a fine and/or confiscation when a second violation has been made. It is legal to ride a minibike/ midi motor on private land at all ages.
Australia
In Australia mini-bikes/mini-motos are illegal in all states. The only legal places are private property or the various kart tracks around the country (which are commonly used by mini moto racing clubs e.g. Wollongong City Raceway which is the only approved track for minimotos in NSW). Riding on the streets or any public place will result in a $1600 or more fine which in most cases is worth more than the bike itself. it is a 3 warning system.. 1.. a warning 2. bike gets impounded for 48 hours 3. bike gets crushed plus rider gets a fine of over $600
USA
DOT laws vary by state, but for the most part minibikes are illegal for use on public roadways since most do not carry the necessary equipment (and often size requirements) to be street legal. In many states the seat of a motorcycle must be at least 25" off the ground, which is often a limiting factor in registration. The age of 14+ are legal to ride but if caught operating pocketbikes or minibikes under the age of 14 on public roadways are subject to a number of tickets, including but not limited to: 1. No indicator lights. 2. No rearview mirror. 3. No horn or signaling device. 4. No headlight. 5. Too-small muffler (noise pollution) 6. Improper lane change. (no blinkers) 7. Reckless driving.
- Exceptions include Iowa where the driving age is 14.
These tickets could add up to over $2200.
Some of the larger "super" pocket bikes, most commonly the X18, X19, and X22 meet all the requirements and can be registered for legal street use in most states. These bikes have headlights, turn signals, tail/brake lights, a horn, and speedometer, and can also do the speed limit in most scenarios(typically 4 stroke bikes can reach speeds of 55mph). In many states all one needs to do is add a rearview mirror and a license plate bracket, but it is best to check with local DMV authorities for exact requirements. In some cases, if the bike requires minor modification to meet requirements, one may be able to register it as a "unique/homebuilt."
Like a full-size motorcycle, the rider must carry insurance, have a current inspection, and wear a helmet if local laws require it. Depending on if the state classes a pocketbike as a "moped" or full "motorcycle", the rider may or may not need a special motorcycle license. If not, a regular driver's license may suffice.
In general no bike is ready for use on the street out of the box. Riding on public roads without registration is illegal. The "super" pocket bikes typically are FMVSS certified. Check the retailer's site or call them for information. Frequently, a Manufacturer's Statement of Origin is required for registration.
Canada
In Canada's Ontario province, it is illegal to ride on roads and sidewalks, but it is up to the police officer's discretion whether or not to press charges. For instance, in Alberta to ride them they must be 14 years old or older and must ride then only on side roads.
UK
In the UK, it is illegal for minibikes to be ridden on public roads. The only places these types of vehicle may be ridden are on public fields, places which are made for this kind of sport and privately owned land with the owners permission. All of these Minibikes are regarded as "motor vehicles" as defined by section 185 of the Road Traffic Act 1988 and so to be ridden on the public road, a motor vehicle must comply with all aspects of road traffic law and meet the mandatory European construction requirements by having a "Certificate of Conformity" indicating that they have European Community Whole Vehicle Type Approval (ECWVTA).
Minibikes are not manufactured to meet these requirements, and would need to be modified significantly to do so. Reported instances of this occurring are incredibly rare, meaning that it is very unlikely that minibikes can actually be registered for road use. However, where a minibike or other vehicle does not have ECWVTA, it might conceivably pass a Motorcycle Single Vehicle Approval (MSVA) inspection which would result in a Ministerial Certificate of Approval, permitting it to be road-registered.
In addition to the Vehicle Type Approval, to be ridden on the road the minibike must be registered with the Driver and Vehicle Licensing Agency, display a valid road tax disc (vehicle excise duty), and the driver or rider must be aged 17 or over (or 16 if the vehicle meets the definition of a moped), have an appropriate driving license, and insurance. The only exceptions relate to electrically-assisted pedal cycles and mobility aids for disabled people. In the UK there are in most areas mini bike tacks for the public and for dirt bikes fields and tracks are fine.
During August 2006 the UK Government ran a campaign to highlight the dangers of minibike misuse on roads and their anti-social use. A guidance document was produced to provide police and other agencies with practical information to deal with the issues and prevent misuse. The guidance outlined the legal status of minibikes and included information on enforcement measures and the provision of legal sites.
Later the death of Abbi Perrin from Louth brought the dangers back into public view. BBC News "Man jailed over mini-moto death"
Police may seize and destroy the vehicle and prosec
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