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Your new mini moto is equipped with an air filter. Some bikes such as B1 Origami rep liquid cooled and Mini Dirt bike have a ‘cone’ style K and N style air filter. The 2005 mk2 mini moto and B1 Origami Replica air cooled bikes have a standard mini moto air filter. Both air filters purify intake of air that is sucked into carburettor. This means that air filter should be cleaned regularly as mini moto’s performance can begin to suffer as engine can become starved of air if air filter is choked with debris. To reach air filter, remove bikes bottom fairing, remove protective cover by unscrewing holding screws. Clean air filter in petrol but make sure that filter is dry before reattaching to you mini moto.
The tyres on your mini moto are filled with air (pneumatic). Please consult your mini moto handbook for appropriate psi. It is important to check tyre pressure regularly, an under inflated tyre will affect performance of your mini moto, acceleration can become sluggish and cornering can become dangerous.
Before riding your mini moto you need to make sure that front and back sprockets are aligned and that chain is perfectly straight running between them. Once you have established this make sure that chain is tensioned correctly (please see your mini moto handbook). To test tension of chain you can manually push pocket bike, if you hear a ‘pinging’ or ‘popping’ sound chain is too loose. If chain is noisy and starts to bind chain is too tight. Make sure that chain is well oiled. The chain needs to be oiled before every ride.
The gearing of you mini moto is dictated by number of teeth on front sprocket and on back sprocket. The sprockets can be changed as an easy way to manipulate top end speed and acceleration, quite like changing gear on a mountain bike. A front sprocket with more teeth will improve acceleration, however top end speed will be reduced. A larger rear sprocket will produce a higher top speed but acceleration will suffer. The gearing on your bike can be adjusted in accordance for track you are intending to ride I.e. a small track with a lot of bends will suit gearing for improved acceleration, however a track with long straights will require a mini moto that is geared for a higher top speed.
The throttle on your new mini moto is a ’twist grip’ style throttle. When you twist throttle throttle cable is pulled back revving engine. It is important to keep this cable free from obstacles and clean. If throttle begins to feel ‘loose’ of ‘gives’, tension of cable can be adjusted via adjusting screw.
The brake system comprises of brake levers, brake cables, brake callipers and brake discs. The brakes on your mini moto are operated by levers found on handle bars. The right hand brake controls front brake, and left controls back brake. Pulling on handle pulls brake cable which in turn pulls lever located on bake calliper. This action pushes brake discs towards each other. This creates friction on brake disc which slows down or stops bike. The brakes can be adjusted in following ways. The brake cable can be tensioned using adjustment screw found on brake lever. Unscrew locking nut, twist screw to reach desired tension. Re screw locking nut. This is a two person job. Adjust screw on hand brake so that is at end of its travel. Undo clamp that holds brake cable on lever located on brake calliper. One person needs to push lever forward as far as it will, second person needs to pull back on brake cable and re fasten clamp. The crake cable will now be highly tensioned.
To start mini moto pull slowly to turn fly wheel. This pumps some fuel around engine, which lubricates moving parts. Pull pull start firmly in order to start engine. Important, do not pull cord to end of its run as it can break. If mini moto does not start check choke and throttle cable.
The choke controls amount of air that is allowed into air/fuel mix. The choke is adjusted via a lever located on side and back of engine. The choke is off when lever is down, and on when lever is up. When you start mini moto choke should be on, when mini moto is warm and ready to ride choke needs to be off.
It is recommend that any adjustments to carburettor are made by a professional. The carburettor pumps and mixes fuel and air. The small diaphragms, orifices and ports mix air and fuel very precisely, this process demands clean fresh fuel.
The jet can be adjusted by screw located in access hole to right of choke lever. The jet is adjusted by manufacture however conditions of where you wish to ride may be different, which means that you will need to make adjustments. Turning screw clockwise will make bike run with a leaner mixture, and counter clockwise will richen mixture. Only adjust screw 1 tern a at time and then test mini moto, this is trail and error. Please note that it is best to find optimum setting for performance and then run a slightly richer mixture as a mix that is too lean can seize engine.
Matt Tong has been importing and riding Mini Motos for over two years. For more information please visit http://www.minimotosandmore.co.uk