Saturday, August 31, 2013

How to Build a Weedeater Bike

Having a motorized bike can be great fun If you are looking to build a weedeater bike here are a few pointers to make your case simple- How Does it Work

Having a motorized bike can be great fun. If you are looking to build a weedeater bike here are a few pointers to make your case simple-

The whole process very simply involves installing a motor on your bicycle and powering your bicycle using the motive force generated by the motor. The motor is usually a 2-cycle variant and runs on a different fuel mixture that is not routinely available at all gas outlets. It is quite cost effective though.

The motor that you plan needs to be mounted suitably on your bicycle. For this you might have to weld the motor in place to the bicycle. Welding the motor directly is not a great idea. You will need to use metal straps to hold the motor and then weld these on to your bicycle.

An easier option is directly purchasing a motor that is specifically meant for powering bicycles. These will come with a proper attachment bracket and all you need to do is fit the attachment bracket over the rear wheel using the simple bolts provided with it.

Bicycle motor kits come in with a complete instruction manual and this can be very helpful if you have never done this before.

With a ready made motor kit all you need to do is take out the rear wheel, attach the provided ring (this is a large circular structure that can be easily mounted over the wheel) over the spokes and fit the wheel back the way you removed it. Next, you install the attachment bracket over the rear wheel and position the motor over it, fixing it with the provided bolts.

When this is done, you will need to simply put on the driving belt over the motor rotor and the ring you just fixed on the spokes and the assembly is complete. Lastly, you will need to complete the wiring circuit. These kits come with a throttle and engine kill switch that you can suitably attach on the bicycle handle bar with clips. You will need to attach wires from the motor to the throttle and the engine kill switch. While planting the wire make sure that it does not have any kinks and carefully tape it along the body of the bicycle to reach the throttle.

Your weedeater is now ready to use, after you pour in the fuel. The fuel generally used is gasoline that is mixed with a lubricant oil. Having the correct proportion is important. You can create the exact fuel mixture on your own using a 1:1 ratio of gasoline with any good quality motor oil that is meant for use with a typical 2-cycle motor engine.

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Thursday, August 29, 2013

How Motorcycle Exhausts Cut Off Sound

If you have are in love with your bike, chances are you will be very, very particular about what sort of exhaust pipes you use. The right ones can make your machine look and feel like a million dollar baby or make it a design nightmare.

The motorcycle exhaust pipe has a very definite role to play in the dynamics of a bike. It directs the gases that come out of the combustion chamber, away from the machine and therefore the rider. Where do these gases come from and why is it important that they be directed away?

The combustion engine in a motorcycle creates a series of explosions that propel the bike forward. Since we are talking of explosive combustion, we are talking of noise and exhaust gases. Now if these gases were thrown out straight from the exhaust port, you would have a problem on your hands. The front tyres would gradually melt under the heat and what's more, your machine would sound like a disgruntled missile.

That is why bike manufacturers design the exhaust pipes carefully. These pipes take the emitted gas away from the exhaust port, pass them through what we call a muffler or a silencer and then throw them away behind the bike, away from the rider. By the time the gases pass out of the exhaust, they have already cooled off and there is little chance of any unwanted combustion.

The technology used to silence the explosive gases is simple. The gases flow at a great speed into the motorcycle exhaust pipes, which are narrow. Then they enter the muffler, which has more space. As the gases expand into the body of the muffler, they slow down and lose some of the sound energy. There are perforated baffles in the muffler that reduce the noise further. So, by the time the gases emerge from the motorcycle exhaust pipes, the noise has been cut down to a reasonable level. It is also important to remember that a good exhaust design can increase the usable power generated by your bike's engine.

Typically, motorcycle exhausts are of two kinds: the full exhaust system and the slip-on system. The full exhaust system connects the pipes to the head of the engine while the slip-on exhaust connects them to the opening where the muffler is. The former is ideal for those who run their machine at full throttle over long distance. The slip on exhaust system is usually used for street bikes. This allows a little more a