In a 4 stroke and 2 stroke bike there is things that can cause that:
1º-Valve is of the compression timing. ( 4 Stroke Bikes Only )
2º-Ignition Stator out of timing.
3º-Filter or Carburetor letting to much air inside, causing a furnace affect because the amount of gas and air is not even!
The heat of the exhaust gasses will turn some polished exhaust pipes blue. This is very common with stainless steel exhausts.
Due to the type of metal used in the production of the exhaust pipes, it is very normal for any motorcycle exhaust pipe to turn red when running, especially at an idle. When the bike is moving the air cools the pipe. That is why the street bikes have chrome covers, so you don't see the red/blue pipe.
it wont have valves in the head. If you remove the exhaust pipe from the head and turn over the engine by hand, there will only be a piston and no valves moving.
by having a exhaust shop weld on a y pipe then just run the dual pipes out the back
Snow, watr, or ice getting into your exaust pipe then it melts...
The exhaust is stainless steel. Heat causes stainless steel to turn blue.
It is right below the exhaust manifold before the down turn of the exhaust pipe and before the catalytic converter.
When the driver let's off the gas pedal going into a turn raw fuel gets pumped into the exhaust manifold. The manifold is so hot the fuel ignites and you see flames from the exhaust pipe. It's totally normal.
The oxygen sensor on the 1988 ford 2.9 liter engine is located on the exhaust pipe just behind the right exhaust manifold. It screws into the exhaust pipe and has a small wire running to the tip of it. Just unplug the wire and turn out the sensor with a wrench.
you must have a cracked exhaust pipe or its leaking at the joint between your cat convertor or somewhere else in your exhaust track.
If a person ties a piece of copper wire at the end of the exhaust pipe on a vehicle the copper is going to heat up. When the copper heats up it will turn a rainbow of colors.
At exhaust valve opening, pressurised gas reduces pressure by moving across the turbine blades and out of the exhaust pipe, the momentum of the moving gas is tapped by the turbine blades producing torque on the turbine shaft.