Blue exhaust smoke and running like on one cylinder - Honda RC51 Forum : RC51 Motorcycle Forums
 2Likes
  • 2 Post By Enxss
 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-14-2019, 05:56 PM Thread Starter
Junior Member
 
Join Date: May 2019
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Blue exhaust smoke and running like on one cylinder

Hi fellaís.
Iím after some info or anyoneís experience with a issue I had with my SP1 on the way home tonight.
I just gone round 2nd gear corner and just started to open the throttle when the bike all of a sudden lost power and sounded like Iíd lost a cylinder ( just like someone had pulled the HT lead off). I pulled in once Iíd got a safe place about a mile down the road and the bike stalled. I had a good look around to find nothing. I restarted the bike after 2 attempts and it ran fine and revved normally but was pushing out a lot blueíish smoke from the exhaust.
Today was the first ride out this year but the bike is ran every month through winter and fully warmed up with no problems.
At first thought, I thought it would be Piston rings as itís blue smoke but Iíve read on the forum here that people have had blue smoke and itís been the fuel presí regulator, can anyone confirm this?
The bike isnít high mileage at only 22k on the clock.
Iíll pull the spark plugs to see if oily wet or just blackened from possible over fuelling.
Any suggestions appreciated.
Sp176 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 05-27-2019, 11:29 PM
Member
 
cr88's Avatar
 
Join Date: Aug 2009
Location: Australia
Posts: 39
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
I'd take a look at the spark plugs, my 01 had a similar fault and new plugs resolved the issue.
cr88 is offline  
post #3 of 3 (permalink) Old 05-29-2019, 06:52 PM
Junior Member
 
Join Date: Aug 2014
Location: Tri-State Area
Posts: 19
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
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.
robertj1979 and Joe XR like this.

Current Rides:
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

Previous Rides:
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 10:46 PM.
Enxss is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome