Questions tagged [motorcycle]

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

Filter by
Sorted by
Tagged with
32
votes
6answers
27k views

Why is a motorcycle's neutral between first and second gears?

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 is ...
28
votes
2answers
21k views

Why do two-stroke engine exhaust pipes look so strange?

Two stroke gasoline engine exhaust pipes are shaped strange. They expand into a wide diameter and then shrink down to a very small diameter where the exhaust gasses emerge into the environment. - ...
24
votes
2answers
6k views

Strange metallic stickers on rims after repair shop visit

These appeared on my rims after taking my bike to a repair shop. Does anyone know what these are and how to remove them?
24
votes
5answers
141k 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 ...
24
votes
4answers
376k 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 ...
21
votes
5answers
200k 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 ;) ...
20
votes
5answers
22k views

Why do Harley Davidson engines suffer from such poor performance?

The modern Harley Davidson engine has very poor power output. Even when highly modified a 130HP engine can cost tens of thousands of US Dollars. Here are specs on one of the modern engines. Harley-...
19
votes
7answers
2k views

Seized nut & bolt - difficult to access

Last year I added crash sliders to my aging Honda CBR 600F (1998) Recently whilst trying to remove the fairing for other work, I found the nut and bolt were "seized". Actually, by using a spanner at ...
19
votes
1answer
7k views

What is happening when a two-stroke engine is said to be “four-stroking”?

Many years ago, I was involved in a hobby of building and flying model aircraft. The aircraft used alcohol-fueled 2-stroke engines with glow plug ignitions. When these engines ran rich (and always at ...
17
votes
3answers
94k 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 ...
17
votes
2answers
2k views

'00 Honda CBR929RR - Unknown issue, help!

Sorry for the ambiguity here.. I'm not sure what the issue is with my bike. I have a bunch of symptoms and my hypothesis is that it's a cascading failure and I'm just seeing a bunch of effects down ...
17
votes
3answers
53k views

What is the motorcycle equivalent of OBD-II?

I once met an OBD-II expert while traveling and asked him if motorcycles (especially the fuel-injected ones) employ a similar protocol. He said that the use of such a protocol is not as widespread ...
16
votes
4answers
19k views

Is there a benefit to belt driven motorcycles?

What are the pros and cons of belt driven motorcycles compared to chain driven bikes?
16
votes
1answer
399 views

What is cold tire shearing?

I have friends that goto Track Days frequently on their motorcycles. If the first session is very cold they use their old tires and don't ride real hard because they don't want to shear their good ...
16
votes
1answer
3k 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 ...
15
votes
6answers
8k views

Why is the speed of a motorcycle measured at the front wheel?

I have been thinking about this, from quite long ago. Why is speed always calculated from the front wheel? Let's just consider the following situation:- You are in a race, and you have given full ...
15
votes
3answers
10k 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 ...
15
votes
2answers
2k views

Yamaha R1 intake tract configuration

Interesting Configuration The Yamaha R1 has a very strange intake design. Notice the intake horns in the image below. They sit above the throttle bodies and are not attached directly to them ...
14
votes
8answers
3k views

How to Remove Stripped Hex Bolts

While trying to remove a rotor from my Suzuki DL 1000 , I'm finding that some of the hex bolts are stripped. Attempting to use SpeedOut does not appear to be producing the desired result. Any tips ...
14
votes
2answers
9k views

Should motorcyle exhaust headers ever glow red hot

I've got a '99 Pegaso 650 which hasn't been running for about 7 years. It's was in a quite a deteriorated state when I got it, i.e. seized carbs, tank full of water, sump full of an ugly fuel/oil mix, ...
14
votes
4answers
738 views

How over-square can you go?

I'm wondering what the limiting factor(s) for bore/stroke ratios are, and how over-square an engine can go in the search for higher rpm and hp (motorcycles specifically)... I know that rpm is limited ...
13
votes
3answers
29k 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 ...
13
votes
1answer
636 views

Can I drive with a broken/without the spider spring in my clutch?

Long story short: I managed to break the spider spring inside my slipper clutch. Apparently these things happen. Below are two pictures of this work of art: Now I have some 300km separating me from ...
13
votes
2answers
2k 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 ...
12
votes
6answers
3k views

Motorcyle Chain needs to be cleaned every time you lube it?

I lubed my motorcycle chain yesterday I used a little too much that it was dripping.At a fuel station a guy told me you should not lube it too often also you should clean it every time with diesel you ...
12
votes
4answers
8k views

Is it OK to skip gears on a motorcycle?

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 ...
12
votes
3answers
18k views

Is it safe to fix a bent motorbike wheel?

Long story short my front wheel took a hit and the rim is now slightly bent. Now, since this is a forged aluminium wheel, replacing it costs the best part of 1500EUR. Being on a budget I thought of ...
12
votes
4answers
28k 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 ...
12
votes
1answer
2k 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 ...
12
votes
3answers
3k 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! ...
11
votes
3answers
8k views

How to upgrade a motorcycle battery to a bigger AH battery?

My motorcycle (honda CBF150) came with a 12V 3AH battery. I want to change the stock 35w headlight to a higher power one and connect them directly to the battery (the stock ones are not, and they ...
11
votes
2answers
1k views

Motorcycle Four Body Carburetor Synchronization Balancing

I would like to adjust four-body carbs by myself, in order to avoid spent money every time. What are the basic rules, tools and secrets of synchronizing multiple carburetor bodies?
11
votes
2answers
3k views

Pulsar 180 - How Can I Measure the Mileage?

Could anybody please tell me how to measure the mileage of my Pulsar 180 bike accurately? I have tried by emptying my tank. I failed miserably, and I had to take my bike walking long distance.
11
votes
2answers
4k views

Holding clutch when braking

I always hold my clutch when braking suddenly in traffic or to move in traffic. I heard that its bad driving. I tried to stop holding clutch and I am unsuccessful in it. How bad is this for motorcycle?...
11
votes
1answer
5k views

Motorcycle Speed Wobble - How do I figure out the problem?

I have a 2005 GSXR 600. I took it for a test drive and the head shakes around 65mph or so and then goes away when I go past that. It's worse when I'm slowing down without the front brake. When I ...
11
votes
3answers
33k views

What are the advantages of upside down forks?

Recently, I have come across many bikes which have upside down front forks. From browsing around the internet, I was not able to get a concrete answer for why it is preferred over conventional ...
11
votes
6answers
27k 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, ...
11
votes
3answers
2k views

What do these compression figures mean

This is a follow up question to 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. After ...
11
votes
3answers
17k views

How to start my motorcycle when the kick-starter fails?

This morning I tried to start my motorcycle but the kick-starter failed. It was idle for about a month but it was riding fine before that . My motorcycle doesn't have an electric starter function. ...
11
votes
1answer
924 views

“Valve like” noise after modifying camshaft ninja 300

A friend and I bought a modified camshaft for his ninja 300/EX 300. After installing and checking/adjusting valve clearance everything seemed ok. After a few laps on our local track the bike started ...
10
votes
3answers
151k 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?
10
votes
2answers
2k views

Motorcycle exhaust rattling / clunking / popping / burbling on deceleration

Lately I noticed a change in the sound my exhaust is making when decelerating from ~4000+ revs while in gear with the clutch not squeezed (that would be engine breaking probably). I'm unsure how to ...
10
votes
2answers
6k views

Why is the engine on my Royal Enfield Classic 350 shutting down?

After travelling 7-8km on my Royal Enfield Classic 350, the bike acts as if the fuel is finished & the engine shuts down, but it starts again when I pull the accelerator. What could cause this ...
10
votes
4answers
26k views

How Does a Quick Shifter work in a motorcycle

I have often seen motorcycles like the BMW S100RR and the famous Ducati Panigale with Quick Shifter technology which allows seamless gear changes. I want to know how these things work mechanically ...
10
votes
5answers
3k views

How to become a self-taught amateur mechanic?

I'm a computer systems engineer (we did a lot of embedded systems and some electrical at university) and I own a Suzuki SV650S. I am considering doing several upgrades to it (e.g. replacing the front ...
10
votes
5answers
455 views

Oil filter on my motorcycle is not coming off

Background: I own a Yamaha XJ6n. This is the first time I'm removing the filter. The last guy who owned this must have screwed it on reaaaal tight. My oil filter is refusing to come off. This should ...
10
votes
2answers
3k 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 ...
10
votes
5answers
629 views

Need to rotate an out of reach bolt or pin

I'm trying to fix the shifter on my dirt bike. I've located the problem, which is a pin that's come loose. The shifter kind of works, but every now and then it gets jammed because this loose pin isn'...
10
votes
2answers
7k views

2003 Suzuki Katana GSX600F - No Start Issue

So I recently purchased this motorcycle from a third party. 2 days ago it would start up fine and you could ride it. The guy I brought it from said the battery was acting cranky so you should change ...
10
votes
4answers
12k 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 ...