Did you notice if the engine's fuel consumption suddenly increased?
A faulty fuel pressure regulator that has suddenly become stuck closed will cause the fuel pressure in the fuel rails of the fuel injection system to sky rocket. The increased fuel pressure will in turn cause the cylinders to eventually flood resulting in the engine stalling. But before stalling, the bike will consume a considerable amount of fuel. This occurs because the ECU does not monitor fuel pressure and, as a result, continues to pulse the fuel injectors at the same duration as if the fuel pressure was within its expected range.
Another indication of a faulty fuel pressure regulator is that once the bike is allowed to stand over night, after stalling the previous day, it will start up immediately the next morning. This is because the excess fuel that flooded the engine has had an opportunity to evaporate. Once restarted, it should stall again after being allowed to idle for several minutes.
The blue smoke that you speak of is a byproduct of the evaporated fuel. When the engine begins to flood the interior of the exhaust system is coated with raw fuel that passes from the combustion chambers unburned. When the fuel eventually evaporates, an oily residue is left behind. Once the engine is restarted and the exhaust system approaches operating temperature, the oily residue begins to burn away emitting a blue smoke. After the proper fuel pressure is restored to the fuel injection system by replacing the fuel pressure regulator and a proper fuel/air mixture is achieved, the oily residue will eventually burn away completely and the blue smoke will cease.
If your bike is experiencing the above symptoms, it may be worth changing the fuel pressure regulator.
2001 Honda RVT 1000R, SP1 - a.k.a. RC 51
* 90 Degree, Single Pin Crank, V-Twin
* World Superbike Championship, 2000 & 2002
* AMA Superbike Championship, 2002
2010 Aprilia RSV4 R
* 65 Degree, Dual Pin Crank, V-4
2017 Honda CBR 1000RR, ABS - a.k.a. Fireblade
* Flat Plane Crank, Inline Four
1990 Kawasaki ZX-10
* World's Fastest Production Bike When First Introduced
And a whole bunch of dirt bikes.
Last edited by Enxss; 06-01-2019 at 11:46 PM.