A self propelled two wheeled motor vehicle with an engine larger than 50cc's.

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2answers
369 views

Why do most mass-production motorcycles have their intakes facing backwards?

Almost every motorcycle I have seen has its air intake mounted such that it is sucking in air from the direction opposing travel. According to fluid dynamics, if the intake is made to face forwards, ...
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votes
3answers
1k views

Larger cylinder volume, but less power, how?

KTM Duke 200 which has an engine of 200 cc, and, on the other hand, Royal Enfield Bullet 350 with a 345 cc engine. I.e. Enfield has 150 cc more than the Duke. But KTM produces 25 BHP of power, whereas ...
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2answers
68 views

Missing part on '87 Ninja 600R

I bought an '87 Ninja 600R (ZX600b) and can't figure out whats missing that goes in or over this hole. Is it missing a plug, a hose, or something else? Is it important?
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2answers
225 views

Motorcycle won't turn over immediately after a pit stop

Motorcycle: 1980 Honda CB900 Custom. After refilling the battery with distilled water, getting it charged and letting the motorcycle sit for a few days... I then went for a ride yesterday. The ...
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2answers
196 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 ...
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2answers
1k views

Royal Enfield Classic 350 - Motor Break-in Best Practice

How many km's should be driven with a lower speed to setup the bore for a Royal Enfield Classic 350, what is the minimum speed for that duration and how many km's should we maintain that lower speed?
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1answer
90 views

Bike currently running rich due to aftermarket exhaust, will adding an aftermarket air filter without any ecu work fix it

I have an MV Agusta Brutale 675 with a GPR Carbonox slip on installed. The air filter is stock and no work has been done on the ECU. My problem is: at this state it's running rich as one can smell un ...
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2answers
80 views

Why is there a trend towards cantilevered rear wheels in recent motorcycle designs?

In looking at the new motorcycle designs that are coming out in roughly the last decade or so, there seems to be a trend towards the cantilevered rear wheel. My question is what are the advantages to ...
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2answers
410 views

Does increasing headlight wattage affects motorcycle mileage

I ride Honda CD-100 SS, a 100cc motorcycle. Does increasing the wattage of the headlight bulb affect the mileage(fuel efficiency) of the motorcycle? If it does please explain how.
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3answers
3k views

Motorcycle Leaking Fuel (1999 CBR600 F4)

Just fired up my motorcycle after 3 years in storage. Changed the oil and replaced the fuel in the tank. It starts easily. It is leaking fuel from somewhere under the gas tank. The engine has a ...
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votes
1answer
87 views

Which of these parts can protect my gasoline from theft?

I am aware of this question, and I believe the answer there is excellent. But what I'm asking for is the list below and what to make of it. Some people in my neighbourhood have been stealing gasoline ...
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votes
1answer
72 views

Pivoted curved-path piston engine

Years ago, I saw a documentary about engine efficiency where people were testing a pivoted, curved-path piston engine. The claim is that the standard piston engine, with straight up-and-down path, ...
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1answer
111 views

Motorcycle front brake lever too close to grip

The front brake lever on my 1998 Honda VFR is coming back way too close to the grip. This is since it came out of winter storage in April. It's an adjustable lever and I've changed it from 3 or so to ...
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votes
2answers
61 views

Varying acceleration while riding

My motorcycle, a KTM Duke 200, while riding is producing varying acceleration. This is during a single ride. For about a few minutes, the acceleration is alright, then after a few minutes, the ...
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votes
1answer
43 views

Lacing spoked motorcycle rims

I have a friend that is rebuilding an old Triumph. He is getting ready to lace his rims and has all the parts ready to go. He has never done it before and lacks knowledge. We have watched a few ...
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votes
1answer
79 views

How do I pull error codes from my Kawasaki motorcycle?

I have an FI light on my Kawasaki motorcycle that is 2002 or newer. How do I get the error codes so I can troubleshoot it?
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1answer
94 views

Motorcycle Starting Issue - no longer starting after attempting to jump with a car battery

I tried jump start my bike with my car battery because the motorcycle battery was really low and would not start. I mistakenly touched both ends of the jump leads together and cause a big spark, ...
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votes
2answers
438 views

Honda CB400 Super-Four - Power Issue

I have a Honda CB400 Super-Four. My bike starts and rides but I can't get more than 5000rpm out of her. If I do then she floods and cuts out. Two of her exhaust pipes are cold and two are warm. ...
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votes
1answer
95 views

Motorcycle petcock leaking around bolts to tank

My petcock is leaking I originally thought it was internal do I took it apart inspected all the gaskets and seals and have it a good cleaning after reassembly it was still leaking and after a better ...
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1answer
131 views

Honda Shadow VT750 louder exhaust noise, low power

Recently, my motorcycle got smashed by my girlfriend (who was driving behind me) in the rear. As a result of the impact, I got propelled into the rear of the car in front of me. Both fenders are ...
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2answers
545 views

How to clean engine when oil is contaminated with metal shards?

During a recent oil change Istripped the oil pan bolt. It took a bit of trial and error for me to realize the stripped hole was a 14mm 1.25 thread so I got a tap and rethread it to 14mm 1.5 thread ...
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votes
1answer
400 views

Honda CBR 250 won't start after heavy rains, puttering noise

There has been heavy rain and yesterday I couldn't start my bike. The main and other fuses are not blown. I ride it regularly. Turning the bike on: https://vid.me/pYNw. The high-pitch noise is not ...
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1answer
54 views

Alternative location for motorcycle ignition coils?

I recently replaced the ignition coils on my 81 Suzuki 450. The aftermarket coils are just large enough that the tank won't seat right, even after adjusting the bracket. Would there be any issue in ...
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2answers
2k views

Ducati Monster M600 - Engine Vibration/Cold Cylinder

I have a 1995 Ducati Monster M600. Recently I noticed an engine vibration and whilst trying to figure it out I noticed that the horizontal cylinder exhaust is hot (hot enough to burn leather gloves) ...
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votes
1answer
67 views

How long can “Stabil”ized gas stay fresh? and can it be improved?

I had my sportbike in storage for at least 3 years. It is Electronic Fuel Injected. It had a full tank of Premium Gas (Shell or Mobil). I put in STA-BIL to preserve the gasoline. Is the gas beyond ...
5
votes
1answer
68 views

Motorcycle dumping coolant from tailpipe

I'm in the process of getting my 1982 Honda Magna back in running condition. I've cleaned out the carb and put in a new battery. It now runs, but dumps a TON of coolant out the tailpipe. Almost a ...
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votes
1answer
53 views

How can I repair cracked/broken non-structural carbon fibre parts?

I managed to crack one of the carbon fibre fork protectors on my motorbike. From the damage it looks like this was due to an impact with a solid object. Below are some pictures: It would seem that ...
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votes
1answer
109 views

Engine weakening for Bajaj pulsar 220F

Everyone knows that apparently a bike looses it's power with age. But I refuse to agree to this. Shouldn't proper care allow your bike to maintain its pickup over the years? I own a 2014 Pulsar 220 ;...
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votes
1answer
124 views

When should I perform a valve head adjustment?

My 2012 Yamaha R6 has about 12000 miles on it. During that times I've had a couple rough accidents and I think the combination of those two factors it may be a good idea to check my valve clearance ...
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votes
3answers
549 views

Motorcycle gear changes alternate between stiff and normal

I have a 6 month old Kawasaki W800 I bought new. Sometimes when I ride gear changes seem stiff and clunky. Other times they seem smooth and normal. Would anyone know what could be causing this? ...
5
votes
3answers
1k views

straight pipes and carb rejetting?

I have a 1984 Honda GL 1200 standard wing and I am going to put straight pipes on it, however some forums say I will need to upjet the carbs, and others say I will not. Has anyone on this site ever ...
5
votes
3answers
2k views

Motorcycle: Honda VTR 250 difficulty starting

I have a 2000 model Honda VTR 250. Up until now the bike has been super reliable. However, recently it has been struggling to start in the morning. The engine turns over many times before catching and ...
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3answers
78 views

Ducati Monster 821 - Ignition problems

I have a 2015-Ducati Monster 821 that have started to argue with me. When i turn the key to on - i see the panel light up and the fuel pump etc starts. But when i klick the ignition button, nothing ...
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2answers
95 views

What are the differences between a normal and an anti-hopping/slipper clutch?

Obviously an anti-hopping clutch won't make the motorbike hop. How is this achieved? What are the mechanical and functional differences between a normal and an anti-hopping/slipper clutch?
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votes
1answer
59 views

Ducati Monster S4 electrical problems

I have a 2001 Monster S4. The fuel level sensor hasn't worked since I bought the bike. This is mostly an inconvenience, but as there is no reserve facility it means I need to keep a close eye on my ...
5
votes
3answers
289 views

Hyosung GT250R Leaking petrol

Motorcyle 2006 Hyosung GT250R Syptoms Leaking lots of petrol when engine is on Info Hasn't been ridden in about 10 months. Has been stored outside with cover, leaning on it's stand. I've ...
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votes
2answers
1k views

Aprillia Pegaso 650 won't start after cleaning carbs, what might be wrong?

I've got a '99 Pegaso 650 which has been sitting idle for about 7 years. The carbs were quite bad shape when I got it. The first time I cleaned the carbs I was able to get the bike started but it ...
5
votes
1answer
101 views

Why does my motorcycle's brake get loose easily?

I drive a 100cc motorcycle which has drum brakes on both the wheels. I have faced this problem with the rear wheel's brake for the past two years and I adjusted it many times. About an year back, I ...
5
votes
1answer
264 views

Yamaha FZS Ver- 2.0 Engine Seizure

I gave my bike (Yamaha FZS ver 2.0) to an authorized service center for it's first-time service. The mechanic didn't fit the drainbolt (which is under the engine) properly causing the engine oil to ...
5
votes
1answer
416 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
1k 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
353 views

Motorcycle: Fuel Injection light comes on after 5 mins of riding

I've bought a brand new bike and have had it for about 2 months. Later this week I noticed that after about 5 mins of riding the Fuel Injection light comes back on. I stop the bike, turn the ignition ...
5
votes
1answer
2k views

Fuel leaking out of drain tube

I just purchased a 1985 Suzuki gs300l. When I put gas in the tank it immediately started pouring out the drain tube that is connected to the air box. What is wrong and how can I fix it?
5
votes
1answer
83 views

What does an EXUP servo and subsequently EXUP eliminator plug actually do?

This question relates to my 2012 Yamaha R6. I removed the kickstand safety actuator because it was bugging me, I found it useless, and my habit is often to lift the kickstand when I start moving ...
5
votes
1answer
160 views

2007 Hyosung GT250R not starting, some repairs have been made

Hoping to find some good advice on fixing my (above mentioned) motorcycle. I'll try to keep it brief but with as much details as I can. I had an issue with the bike and it sucked up some varnish from ...
5
votes
1answer
1k 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 ...
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votes
4answers
3k views

Motorcycle: stiff chain links - able to repair?

So after tightening my chain the other day I noticed a creaking noise - its seems there is a tight spot in the links. I have sprayed this with chain oil and let soak. I know I will need to replace the ...
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votes
0answers
123 views

2012 KTM Duke 200 - Low acceleration in low rpm [closed]

Recently my bike (KTM Duke 200) is suffocating to deliver enough power between 2000-3000 RPM. I took the bike to a service station and they told me that its an engine problem, low compression and ...
5
votes
0answers
64 views

2011 Hyosung GT250R - Stalls and Stutters at Lights [closed]

I have owned a 2011 EFI Hyosung GT250R for about a month. I haven't had any problems. Today, I was riding in 2nd gear and I shifted down to 1st to make a quick stop, and once stopped the idle speed ...
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votes
5answers
8k views

How to save fuel on downhill slopes on a motorcycle: clutch or neutral?

I have a two wheeler i.e. bike (Honda company, four stroke) which has four gear. While driving my bike, when I come to downhill slopes, I shift the motorcycle to neutral to save the fuel. (The slopes ...