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Question:

I have a few questions about the definitions of some motorcycle design terms?

Just to say first of all, i have tried googling these/looking on pedia but i have had no luck :(If anyone could shed some light upon what these mean then i‘d be very grateful:Fly-by-wire throttleBrake-by-wireRam airDry clutchInverted forksPre-load suspensionSuspension dampeningAlso, if anyone could tell me the main differences between a V-twin, V4 and V4 inline motorcycle then i‘d appreciate that too :)Thanks in advance for all and any help :)

Answer:

try a bottle of fuel treatment and a new filter first 10 bucks and autozone can help you with the other will give you a print out if you ask that might help
it could be the 02 sensor. unhook the battery, unplug the wire that goes to the sensor, take a wrench and unscrew the sensor and screw the new 1 back in, hook up the wire and the battery.the sensor is usually either on the manifold or in the exhaust pipe.
The Baron above is dead on with his descriptions of the terms you listed. As far as the engines you mentioned. First off, the is no such thing as a V4 in-line, that is a contradiction of engine designs. An IN-LINE engine means that a multi-cylindered engine has all it's cylindersside-by-side, (or front-to-rear), in a straight line with each other. A V style engine is basically the same as a car V-8 or V-6the cylinders are in a V shaped configuration. There are 4 different types of V-Twinsa TRUE V-Twin design is what Harley uses, the cylinders face front and rear and are in a V. HD uses a crankshaft design that runs both connecting rods on a single crankshaft pin, making the cylinder fall directly in line with each other, one in front of the other. Most Japanese V-Twins run an OFFSET V-Twin engine, meaning that that connecting rods are on 2 separate crankshaft journals. This causes the 2 cylinders to be slightly offset side-to-side, with one in front of the other. BMW uses the OPPOSED - Twin design. This design is a 2 cylinder that has the cylinders off to the side of the engine, one points straight out to the left and one to the right, instead of one in front of the other. Moto Guzzi and some older European bike companies, used a combination of the Opposed Twin and the V-Twin.this was the OPPOSED V-Twin. The clinders were in a V shape, but also opposed, going out to the side, instead of front-to-back.
Motorcycles that use a dry clutch include Ducati and Moto Guzzi. One clutch disc sandwiched between the flywheel and the pressure plate. Clutch is not immersed in engine oil. Virtually all motocross motorcycles use inverted forks. Many sport bikes are equipped with inverted or upside down forks. First URL talks about all motorcycle forks. Towards bottom right shows a motorcycle with USD (upside down) forks. Second URL talks about suspension in general. This also included dampening. Dampening controls the springs. V-Twin ala Harley-Davidson. V4. Four cylinder engine with the crankshaft oriented transversely i.e. left to right as you sit on the motorcycle. Honda Sabre and VFR use V-4 engines. V4 inline. Four cylinder engine with the crankshaft oriented front to back as you sit on the motorcycle. The Honda ST1300 is an example of a motorcycle equipped with an inline V4. Typically these type of motorcycles are shaft drive.
Fly by wire or electronic throttle, means no cable to control the throttle, it's done with electronics. Brake by wire I don't believe I've ever seen on a cycle. Mercedes screwed around with it for awhile. In Mercedes, the input was all electronic, but the brakes were all hydraulic. Kind of weird. Hardly worth the effort or risk. Some advantages though. Ram air is just a way of having more air enter the intake when the bike is moving. Again, not as beneficial as it sounds, looks cool though. Dry clutch. Is like what a car has, a dry area between the engine and transmission and there is no oil, just a dry clutch plate, flywheel, and pressure plate. Most transverse engine cycles use a wet clutch, there is oil in there and numerous clutch and friction plates. Inverted forks have the sliders on top and the tubes on the bottom, which is opposite of the traditional way to build a fork. I am a little hazy on the true advantage of this. Preload suspension, well that's when you set the suspension spring setting, I don't think it is a design term though. Suspension dampening, the dampening (or damping) of the suspension is how much or little the suspension rebounds when hitting a bump. On shock absorbers it is often adjustable (as well as the preload), but not always, and I would also say this isn't a design term.

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