What makes a motorcycle backfire?

Question:
When I first start my motorcycle I let it idle to warm up. After sitting a while it always backfires very loudly when I first get on it. I have a Yamaha VStar 1100 if that makes any difference.

Answers:

What is this cc they are referring in a motorcycle?

--Don't let your bike just sit there idling. The choke circuit is needed for initial start-up.
--If you leave the choke on, when it warms up a little, the choke circuit is putting to much fuel into the cylinders. The added fuel doesn't get fully ignited and just sits in the exhaust pipes. When you get on the throttle, the unburned fuel in the pipes gets ignited and explodes, causing the backfire.
--Use the choke to get the bike running. You should be able to start riding after less than a 1/2 minute. And during that time the oil is well circulated to lube all internal parts.
--As you're ridding, slowly turn the choke off in increments. As soon as the bike will idle on it's own, the choke should be off to prevent an over rich mixture and foul the plugs.
--Plus you're well into your ride and have saved a little on gas mileage.

Dad has a 1983 suzuki gsx1100 has new battery,wiring clean,fuse box good,but wont charge battery.Any ideas?

Timing is off

I have a 2006 Road King. Looking to convert the foot shift to a old style hand shift.?

Condensation in the gas tank.

Can i fit a yamaha R1 rear shock absorber in a YZF 750?

raw fuel meeting oxygen in exhaust and igniting from heat or flame. find out why you are not burning most of the fuel and or have exhasut leaks (timing off? bad valve?)

I'm looking for a good, used, cheap sportbike. Where can I find one?

There are two types of backfire. One is an explosion in the engine's exhaust manifold or exhaust system, this is most correctly referred to as afterfire. The other is an explosion in the engine's intake manifold.

in which country bicycle was made first time?

Backfire in an automobile engine typically results from various malfunctions related to the air to fuel ratio. Usually, backfiring occurs in carbureted engines that are running lean where the air fuel mixture has insufficient fuel. ("Running lean" is typically a sign of mal-adjusted carburetors or fuel injection where there is not enough fuel for the amount of air). Afterfire, occurs in engines that have an emission system malfunction (air injection system diverter valve), exhaust leak or unburnt fuel in a decatted exhaust system. When a driver shifts up and lets off the gas, the engine has a moment of running rich or with insufficient oxygen. This causes an incomplete burn which causes the fumes to explode in the exhaust system. The leak itself is the most dangerous aspect. Without it, the mixture would cool enough not to explode. A fuel injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air-flow sensor is defective.

abt computers?

Common causes of backfires are:

How Do i fix my kill switch for a goped gsr40 because every time i press it it wshocks me?

Timing – If car is distributor-less
Timing – If a two stroke engine is backfiring every other stroke.
Fuel pressure, fuel filter and pump – leaks and corrosion could cause lack of fuel during the fuel injection event.
Bad wiring in ignition – ..if car won't run for more than a few moments.
In older engines, backfiring may be considered normal. Backfire is rare in modern cars with fuel-injection and computer-controlled fuel mixtures.

where can i find a bike gang in california ?

Common causes of back fires in the intake manifold are bad spark timing, or incorrect (usually lean) fuel ratio.

I am going to buy a used Ninja 250?

When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner. A common air filter will allow the gases to escape, but will block the flame front. On many small marine engines, no air filter is used, but a screen is placed over the intake of the carburetor as a flame arrestor to prevent these flames from escaping the intake, and potentially igniting fuel, or fuel vapors in the enclosed sump or bilge of the boat and causing a fire or explosion. Improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire.

i have a yamaha banshee 1989 iwant to know how meny oz. of premix oil inead to add per 2 galons gas thank you?

In drag racing, backfires in the intake usually result in the complete destruction of the intake manifold, the carburetors, blower, and sometimes engine.

if you have reeds for a dirt bike taken out how can you tell if they are bad?and have cracks?

You didn't say whether it backfires on acceleration or decelaration. If it backfires on acceleration, the mixture is too lean. That means that you got to keep a little bit of choke on untill you've ridden it for a couple of miles or so. If it backfires on decelaration, it could be you have an air leak into your exhaust system, when that happens, the exhaust sucks in enough air to make the unburned exhaust gases combustible and that's when the backfire happens.

Where do I sign up to when the OCC BIKE please tell me.?

Check your valve clearances.

What would be the best performance upgrade for an 05 street glide with the 88"?

Sounds like the timing is off or dirty plug

I'm importing a vespa from Vietnam?

timing is off or the plug needs replaced i would try the plug first its cheap

More Questions & Answers ...

how to do a burn out on a cr 80?

motorbiking?

Where can you find a Hyosung dealer near Waldorf, Maryland?

tourqe specifications?

does anyone know where i can get a moped on the cheap i'm a nurse and i need to get to work on time?