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

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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?
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3answers
23k views

1994 Suzuki GSX600FR Katana - How do I know if motorcycle chain & sprocket need replacement?

I'm aware of how important they are, but have been coming up empty in my searches to determine if they're worn to the point of needing replacement. The service manual just says to inspect and replace ...
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3answers
348 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 ...
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2answers
676 views

Reboring a cylinder: compression ratio of new piston

I'm going to have the cylinder of my 2004 TT600RE motorcycle rebored (because it's damaged, not to increase power). The manual says the piston size is 95mm and the compression ratio is 8.5 : 1. I'm ...
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2answers
2k 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:
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3answers
3k views

Weak front brake on dirt bike

After changing the air tube in my front tire and reinstalling the wheel on my Suzuki RMZ450, I noticed that the front brake lost a lot of stopping power. What caused this and what do I need to fix to ...
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2answers
122 views

Increasing rear sprocket size for torque gains, will a dyno tune be required?

In order to get some mid range and torque gains, I've decided to replace my rear sprocket with a bigger one. I asked a friend of mine (experienced motorcyclist, been riding for decades) and he said I ...
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2answers
109 views

What is a bobber?

What is a bobber and are there advantages for turning your motorcycle into one as opposed to running it stock?
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2answers
3k 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 ...
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1answer
309 views

My brand new bike stopped while running - why? [duplicate]

I purchased a brand new Royal Enfield Classic 350 yesterday. This morning I rode it to my office (around 20 Km), parked in the basement, and in the evening I started to ride home. After 10 Km the ...
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2answers
392 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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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
233 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
203 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
100 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
85 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
161 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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2answers
425 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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4answers
16k views

Squeaking brakes on motorcycle - an issue or not?

The front disc on my motorcycle emits a low pitch squeaking noise when I'm pulling up to a complete stop (almost like the sound train brakes make when pulling up to a station). This only happens when ...
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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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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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1answer
76 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
123 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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2answers
62 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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1answer
44 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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1answer
83 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
100 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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2answers
544 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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1answer
111 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
142 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
586 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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1answer
433 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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3answers
80 views

Motorcycle randomly loses power

I have a single cylinder, 200cc, carbureted, 5 speed, 12V, 2006 Lifan LF 200 motorcycle that typically runs fine. It will sometimes randomly lose power and I cannot get it to go above 25 mph. When ...
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1answer
71 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 ...
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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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1answer
59 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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1answer
132 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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3answers
348 views

GSXR 1000 K5 turns off on hot days

My name is Joel from Sydney and I'm trying to diagnose a strange problem on my bike. Apologies if this is the wrong forum to be asking this question I'm new to this forum. Bike: GSXR K5 1000 Mods: ...
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3answers
565 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? ...
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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 ...
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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
90 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
88 views

2005 Honda CBF 600 — clutch plates get stuck overnight

I bought a 2005 Honda CBF 600S, rode it for about a week, and then asked my mechanic to check if everything is OK, and to replace the clutch cable. The mechanic also replaced all the fluids, ...
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2answers
108 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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1answer
66 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 ...
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3answers
327 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 ...