Why is my Yamaha Grizzly backfiring?
Backfiring usally occurs when the engine is running lean, or the intake valve(s) are not fully closed during the combustion stroke. Was the bike backfiring before you did your maint.? If not – try removing the uni filter and see if the problem goes away. If it does the engine is/was running too lean.
Why does my motorcycle backfire when I open the exhaust valve?
Your spark plug can cause a motorcycle to backfire if it does not spark after opening the exhaust valve. A misfired plug will quickly ignite the unburned fuel that is present in the exhaust system. A bad spark plug can also have incorrect ignition timing with the compression, or it can be too worn out to perform its job.
What causes a 2 stroke engine to lose power?
However when the free flow of fuel is interrupted by debris or dirt in the veins, it can begin to cause problems. Even the smallest piece of debris that gets past the fuel filter can cause issues the further down the veins it manages to travel, as the veins get smaller and smaller in size.
What do you do if your motorcycle backfires?
Consequently, your motorcycle will backfire and even fail to accelerate. But you can find a working solution to this problem by simply cleaning the carburetor to make the fuel flow through it properly.
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.
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.
Where are the carburetors on a Yamaha Venture?
You can see and access the ones on the right side carburetors #3 and #4 by looking through from the left side of the bike, and access the left carbs #1 and #2 by looking through from the right side of the bike. Using a long slotted screw driver, pry off the brass covers (they come off very easily).