Why would my motorcycle backfire and not start?
Too little fuel in the cylinder and an excess amount of air can be the culprit to your backfiring problem. So when there’s way too much air then sometimes the fuel won’t combust. Then as soon as the exhaust valve opens and the air/fuel mixture hits the hot exhaust header, the fuel ignites and makes the loud bang sound.
What causes a backfire on a Yamaha Venture?
The backfire is caused by too lean a setting of the pilot circuit. This causes hotter exhaust gas temps. which ignite any unburned mixture in the exhaust pipe. On a cold day, these temps would be lowered by the ambient temp enough to prevent backfiring. This is no mystery, it just confirms the too lean pilot circuit.
Why does my Yamaha Star Venture make noise?
Repeated Whining Problem Older Yamaha Star Venture models are infamous for a particular whining noise that occurs during rides. Reportedly, the noise is largely absent on startup and increases as the bike speeds up, reaching a crescendo around 60-75 mph.
Is there a problem with my Yamaha Venture?
This is a known problem on the Venture/Eluder line of motorcycles. In fact, older models were known to have their fuel pump fail at high mileage (mostly at 50,000 miles or higher). The fuel pump directs fuel from the tank to the engine. Every motorcycle owner knows that a bike will run poorly without fuel or may not run at all.
When to kill a Yamaha Star Venture engine?
Newer Star Venture/Eluder models also feature large air ducts that help redirect heat away from the rider and increase airflow towards the engine cylinder. However, if you’re stuck with an older model, the smartest move to make is to kill the engine if the bike is idling for more than 5 minutes.
The backfire is caused by too lean a setting of the pilot circuit. This causes hotter exhaust gas temps. which ignite any unburned mixture in the exhaust pipe. On a cold day, these temps would be lowered by the ambient temp enough to prevent backfiring. This is no mystery, it just confirms the too lean pilot circuit.
Is it dangerous to have a motorcycle exhaust backfire?
A motorcycle exhaust backfire is an annoying and potentially dangerous problem to have. It can damage your ears if you’re in a confined space, or could start a fire as some backfires even emit flames, I’ve almost had my hand burned once from a pesky backfire problems I was troubleshooting.
What does too lean mean on a Yamaha Venturer?
In other words, coming of idle or decelerating with the throttle closed. The pilot circuit mixture is preset to a too lean position at the factory. Too lean means that the fuel air ratio is more air than fuel, resulting in high combustion and exhaust gas temperatures.
How do you change the screws on a Yamaha Venture?
Throw the covers away, you won’t be replacing them. You now will be able to see the pilot screws with a cross pattern on each head. Turn each pilot screw counter clockwise exactly 1/4 turn out (90 degrees) Note the original position of the screw and be sure you turn it only 1/4 turn. This will fix your problem.