Why does my Yamaha Virago backfire?
In general, backfiring on deceleration (as opposed to acceleration) is generally caused by a lean condition in the pilot circuit. What happens is that the mixture leans out enough to where is fails to ignite consistenty. Newer Virago carbs have an ‘enricher circuit’ which cuts in on deceleration to help this problem.
Why is my Yamaha Virago bike running rough?
The Bike Isn’t Running Well One of the chief complaints you hear about with the Yamaha Virago is bikes running rough— by sputtering, jerking, and lurching. In worse cases, riders have experienced a stall when the bike cuts out completely. The likeliest factor responsible for the running problems is an unkept fuel system.
How big is the fuel tank on a Yamaha Virago?
The Yamaha Virago’s reputation as a trusty cruiser is sometimes hampered by its dismal fuel holding capacity, particularly for the Virago 535, a small 12-liter tank. Virago owners are often reluctant to take long-distance moto-trips on their Virago; the tank only lasts only about 100 miles.
What causes the engine to backfire on a virago?
This, in turn allows some unburnt fuel to get into the exhaust pipes. Then when the engine does fire, these unburnt gasses are ignited in the exhaust pipe, causing the backfire. Newer Virago carbs have an ‘enricher circuit’ which cuts in on deceleration to help this problem.
How can I test my Yamaha Virago backfiring?
It can be tested with a vacuum pump. QUICKLY draw a vacuum on the small pipe while blowing through the end of the valve (where air is drawn in) seal the valve tightly with your lips. Air should be expelled through the large pipe for a short time and then stop quickly.
What to do about compression backfiring on a Yamaha Virago?
IN REGARD TO THE COMPRESSION BACKFIRING PROBLEM WHEN DE-ACCELERATING, I THINK I MAY HAVE A CURE. A COMBINATION OF INSTALLING HIGH QUALITY SPARK PLUGS (SUCH AS SPLIT FIRE) GAPPED METICULOUSLY, CLEANING THE PLUGS AND CHECKING THE GAP EVERY 1,000 MILES, AND USING AN OCTANE IMPROVER IN THE GAS HAS VIRTUALLY ELIMINATED MY PROBLEM.
This, in turn allows some unburnt fuel to get into the exhaust pipes. Then when the engine does fire, these unburnt gasses are ignited in the exhaust pipe, causing the backfire. Newer Virago carbs have an ‘enricher circuit’ which cuts in on deceleration to help this problem.
What causes a Yamaha XV1100 to backfire?
The XV1100 takes long-reach plugs. Can you believe it!! Happy now, although a bit dishearted about the dealer….Joe Addison. Found out that the problems that cause the backfire are definitely located in the area of the emission system (air induction system).
Can a virago backfire on a commercial toilet?
I own a 1983 virago xv920k with which I have had the decel backfire problem. The mixture control valve works exactly like a flush valve for a commercial toilet! Intake manifold vacuum acts on a diaphragm which in turn actuates a plunger allowing air to be inducted into the front #2 cylinder.