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13
votes
4answers
3k views

What is the technical reason the engineer decided the motorcycle gear pattern as follows?

The gear pattern is selected by clicking a lever with your left foot, and is typically laid out as follows: 6th gear (if applicable) 5th gear 4th gear 3rd gear 2nd gear NEUTRAL 1st gear What ...
11
votes
2answers
10k views

Why is my motorcycle losing power when accelerating?

I ride a Honda Rebel 250 motorcycle and over the past few days I find that the bike is losing power when accelerating fast. When I twist the throttle to accelerate quickly (in any gear) I hear the ...
10
votes
3answers
3k views

Why (almost) all dirt bikes have single cylinder engine?

Every dirt bike i know has a single cylinder engine. I myself ride a Yamaha XT660Z which has a huge 660 cc cylinder. What are the characteristics of those engines? what are the benefits of such ...
9
votes
5answers
28k views

Why should the fuel petcock valve be turned to “Off” position when not using the vehicle?

It’s mentioned in the user manual of my motorbike, that when not using the vehicle, I should turn the petrol tap (the one that has three positions “On”, “Off” and “Reserve”) to “Off” position. I don’t ...
9
votes
1answer
1k views

How do I find the correct pins in a CAN-BUS connector?

This question might be too technical for this forum, but I'll give it a go. I have a 2012 BMW R1200R motorcycle with CAN-BUS. I'd like to make an Arduino interface to the connector on the bike, but I ...
8
votes
5answers
28k views

What does the 'cc' mean on a motorcycle?

I'm relatively new to motorcycles, my flat mate taught me how to drive his two Royal Enfields around New Delhi, and for the past year and a half I've been taking care of them as they break down ;) ...
8
votes
4answers
2k views

Gasoline is dripping out of a rubber tube outputting on the bottom of my motorcycle - is this normal, or is it a problem?

What bike? A BMW 650, 1996 model. What's the problem? I noticed a slow, but steady, drip of gasoline from one of two rubber tubes that output to the bottom of the bike. I think the other rubber ...
8
votes
2answers
120 views

Unknown part fell out of my motorcycle

So I was taking the battery out of my bike (99 Honda Shadow 750 ACE) to ship it this past December, when two parts of the bike I'd never seen fell out from somewhere near the battery case. They sort ...
8
votes
3answers
1k views

How do you get the carburetors out of a 1983 Kawasaki KZ1000 P?

It's a 4-cylinder engine, and the carbs are really wedged in there. The best way I know is to loosen the boots on both sides, pull the carbs back, and try to slip them out sideways, but what a pain! ...
8
votes
1answer
677 views

How do I drain the brake fluid for a 1999 BMW K1200RS?

I need to drain the brake fluid for my 1999 BMW K1200RS with ABS in order to do some minor service on the Master Cylinder, but I don't have a service manual for the bike. How should I go about doing ...
7
votes
3answers
5k views

What may happen if I do not replace my motorcycle's chain

I have a aging (y2k) motorcycle with not too many Ks on the clock. I have been told by a mechanic that I need to replace my sprockets and chain. This seems reasonable since the chain has been poorly ...
7
votes
4answers
7k views

How to stiffen up a loose ball & socket joint for a motorcycle mirror?

I have bar-end mirrors on my Buell 1125CR. They're fairly heavy anodized aluminum pieces that pivot on a ball & socket joint for adjusting the angle of view. One of them fits snugly on the joint, ...
7
votes
2answers
161 views

What are the Advantages of a Single Side SwingArm on Motorcycles?

I have noticed that Ducatis , Honda and Triumph have bikes with a Single Sided SwingArm Much like most of the scooters. Are there any advantages of following this design , if so why are not all ...
6
votes
3answers
2k views

Is it OK to skip gears?

I'm not sure if this is on topic, but I'd like to know the answer before it comes a repair question. I have a Y2K Triumph Speed Triple - great bike. First gear comfortably takes to 90km/h. Needless ...
6
votes
2answers
1k views

Why won't my Honda Rebel shift when idling?

I recently ( and successfully ) rebuilt the engine of my '09 Honda Rebel; she's running well but doesn't want to change gears when idling. If I'm moving she shifts gears without any hanging, ...
6
votes
1answer
1k views

My motorcycle is refusing to start, which common problems should I look for?

I've just taken my motorcycle out of storage, I rode her around the block once, parked her, and now she is refusing to turn over. The starter seems to be running fine. I've just filled the tank with ...
6
votes
1answer
594 views

Play in motorcycle chain - how much is ok?

Riding to day I could hear a rhythmic tapping sound. I occurs when I ease off the throttle. I think it is the chain tapping against the plastic chain guard when tension on the chain from accelerating ...
6
votes
2answers
482 views

Change in exhaust note after extreme backfires--what did I break?

I had quite a morning with my 1986 BMW K75 this weekend. The plan was to ride the bike to a friends house to store it for the winter. The weather was pretty cold on this particular morning, perhaps ...
6
votes
1answer
178 views

Idling issues on 1995 Kawasaki ZZR600

The bike was running rough and could not get a constant idle speed. I checked the air filter and it was pretty well shot (contamination, etc.). As I awaited delivery of the new air filter, as a test I ...
5
votes
5answers
975 views

Preventing visor from fogging

How do you prevent your visor from fogging? I ordered a pinlock today for my HJC helmet, but had read some good things about NEC pinkstick (some kind of wax for visor). Usually I just keep the visor ...
5
votes
7answers
5k views

How to Clean a Paper Air Filter

I have a 1989 Yamaha FZX 750, and I can't find a replacement air filter for it. What's the best method to clean the air filter?
5
votes
2answers
488 views

Why are gears designed in this pattern in motorcycles? [duplicate]

On motorcycles with manual transmissions, the shifting gears goes (down to up) like this: 1st Gear (all down) Neutral (half up) 2nd (full up) 3rd (so on) What is the logic behind this? Wouldn't ...
5
votes
3answers
260 views

What is the best practice to maintain a bike?

I have an Avenger 180cc bike, I want to maintain the bike without much help from the service center, external help etc. What would be the best practice methods?
5
votes
2answers
2k views

How might I fix a dent in a Honda Rebel fuel tank?

In a silly move during an engine overhaul, I dropped my Honda Rebel's fuel tank and put a dent in the top side. Is it possible to pull this dent out? I've heard there is a method using heat and ice ...
5
votes
3answers
4k views

Motorcycle: Puncture in tubeless tire. OK to plug yourself?

I got a nail in my tire the other day. Its wedged in the tire so tightly that the tire isnt actually losing pressure. A friend told me I could fix it myself by using a kind of volcanised rubber glue ...
5
votes
2answers
2k views

What problems to look for when buying used motorcycle

I'm planning to buy a used Honda Goldwing. Researching the prices, my budget will allow me to get something in the range up to year '95-96 models. As this is going to be my first bike, I have no idea ...
5
votes
2answers
70 views

Kawasaki H2R flames come out of exhaust system

Kawasaki recently launched the H2R motorcible. The world’s only supercharged production hypersport streetbike. This bike has 326 bhp. I saw few videos of this incredible bike. My question is about ...
5
votes
1answer
408 views

Motorcycle stood for over 12 months, turn over by hand first?

My 2006 GSXR 750 has been stood for over 12 months, I have drained the tank, and oil, and I'll do the coolant after I get it started, and give it another oil change. Is it worth me removing the plugs ...
5
votes
2answers
543 views

Is it okay to run aviation fuel (100 low-lead) in a dirt bike?

I'm wondering if it will be okay to run 100 octane low-lead aviation fuel in my 2007 RM250 motocross bike (two-stroke). Half of the people I've asked say yes, while the other half say no. Will it be ...
5
votes
1answer
113 views

Motorbike rear wheel hub reassembly

I want to get a new tire fitted on my 2003 Suzuki DR650 and removed the rear wheel. Following the manual I took the chain guard off, removed the axle, made the wheel free of chain and brake caliper ...
5
votes
2answers
759 views

What are the causes of fluctuating intake manifold vacuum

I have a 2005 Honda CBR600 F4i which suffers from occasional hesitation at low rpm when accelerating. I also get occasional fault codes from the ECU indicating a vacuum leak. Today I connected a ...
5
votes
2answers
160 views

Solution against motorcycle gasoline theft?

During these last few weeks, somebody has been stealing gas from my motorcycle. It's a Honda Vt 125 Shadow, and since all the wires and hoses are apparent, it's pretty easy to unplug the hose and ...
5
votes
1answer
199 views

Does the air screw only affect the pilot jet?

I have a 2 stroke motorcycle, it's Kawasaki KR150. When I try to do some jetting on its carburetor (it's Keihin PWL26), I saw that there's an air screw. So now I've been wondering about this air ...
5
votes
1answer
197 views

Should I replace this stator? (2007, Suzuki, DL1000)

I opened my stator case to inspect what I thought was a bad stator. I discovered the following issues with my magnets: Broken Magnets: Cracked Magnets: Not sure if I need to replace stator ...
5
votes
1answer
660 views

Suzuki GSR600 low idle revs and unstable

Just a week ago I noticed in my motorbike unstable rpm, +-300rpm. But today I found that the idle rpm are below 1000rpm, at some points around 500rpm (Normally is 1500rpm). I'm due for the annual ...
5
votes
1answer
101 views

No spark on my new motorcycle

I recently purchased an 81 Suzuki GS450L, my very first bike. I'm not getting a spark. When it dies, it does so silently. No backfire, sputtering, etc. My first thought was that it had aftermarket ...
4
votes
4answers
2k views

How to add hybrid technology to a 4-stroke engine motorcycle?

I am enthusiast of automobile, and especially of motorcycles. I don’t know much about engines practically, but I read a lot. I was reading an article at How Stuff Works about the hybrid technology ...
4
votes
3answers
16k views

Start Motorcycle Garaged for Over a Year

What do I need to do to get my motorcycle running again after I've left it in my garage for over a year?
4
votes
2answers
3k views

Why isn't it allowed to ride a new motorcycle too fast?

I bought a new motorcycle. The manual says that for the first 500 km, I should not twist the throttle more than half. And for the first 1800km, should not twist it more than 75%. Why isn't it allowed ...
4
votes
2answers
267 views

What is this pipe coming out of the petrol tank under the seat

Sorry, this is a newbie question, but what is this pipe coming out from the petrol tank under the seat? The bike is a 1989 Kawasaki ZZR 250:
4
votes
3answers
260 views

I am looking to buy a motorcycle which I can fully (or as close to fully) maintain and repair on my own. Which models should I look at?

Which motorcycles are well known for being easy to maintain and repair, and would be suited for a beginner to cut his teeth on? What are some features of motorcycles that I should look for, when ...
4
votes
3answers
3k views

Can a motorcycle's brake lever be bent back into shape?

I recently had a low speed spill on my bike leaving the brake lever rather bent. Can I bend it back (roughly) straight or it is likely to just break? Given that it is cast aluminium, I suspect is will ...
4
votes
2answers
222 views

Motorcycle - sudden brake failure - suddenly gone - is it safe?

Recently, my old Honda ST 1100's front brakes failed. It was very sudden; meaning one moment, they worked perfectly, the other, not anymore. There was no gradual decline; no warning, nothing. The ...
4
votes
2answers
206 views

Proper fuel for motorcycles?

I've heard that regular petrol (92 octane ULP) from some fuel companies is not good for motorbikes as it is intended for cars only. Is this just an old wives tale?
4
votes
2answers
136 views

How easy (is it possible) for an amateur to change the drain tube of a motorbike fuel tank?

The bike is a 1998/99 Honda CBR 600F. The drain tube seems to be corroded inside the fuel tank, based upon 2 symptoms: Filling the tank more than 3/4 full causes petrol to drain from the drain tube ...
4
votes
2answers
150 views

Does gasoline ruin an air filter?

The carburetor on my 2005 Honda Shadow Aero (VT750C) had a bad leak and flooded the air cleaner assembly with gasoline. The air filter was completely soaked with gas, so I let it air dry. Is my ...
4
votes
3answers
2k views

How to remove all the fluid out of my motorcycle fuel tank?

I will be cleaning out my motorcycle tank using electrolysis. First, I have to remove all the gas from the tank, and then do the cleaning and then remove all the water that's left over, but I have a ...
4
votes
2answers
335 views

How do I handle scarring on a cylinder head?

A few weeks ago, my Rebel 250 blew a piston, allowing the piston rod to beat on the top of the cylinder and the valves. There's some scarring there now, as well as a jagged protrusion or two. What ...
4
votes
3answers
36k views

Symptoms of Lean or Rich carb settings on a motorcycle

I have a 1981 Yamaha XS650. I recently put in K&N stock replacement filter (ie, they are in the airbox and conform to the size of the original), however they may be leading to a leaner mixture ...
4
votes
1answer
168 views

Clutchless Downshifts Using Throttle Blip on a Motorbike/Sequential Gearbox

This is with respect to non synchromesh, sequential transmission. Ducati along with several after market systems, implement clutchless downshifts by automatically applying a slight throttle to unload ...