Senior VR Member
Join Date: Jul 2008
Location: Second Star to the right, then straight on till morning.
Thanked 2,266 Times in 1,543 Posts
So, for the engine to operate, you need 4 things. Air, fuel, compression and spark.
First off the CHEC on the display is telling you there is a problem with a sensor. On the right side of the bike, remove the cover panel just below the saddle. There is a white plug (the dealer service plug). You can use a paper clip to jump the "dealer wires". Find the white connector beneath this cover. With the bike off, use the paper clip to short out the white/red striped wire and the black/white striped wire. Don't start the bike, just turn the ignition to on as you are watching the readout on the speedometer.
If your bike is stock and all is fine is should read only "C00".
Here are the codes from the service manual.
c12 crankshaft positions sensor, pickup coil signal, signal generator
c13 intake air pressure sensor #2, for front cylinder
c14 throttle position sensor
c15 engine coolant temp sensor
c17 intake air pressure sensor #1 for rear cylinder
c21 intake air temp sensor
c23 tip over sensor
c24 ignition signal, coil #1 for rear cylinder
c25 ignition signal, coil #2 for front cylinder
c28 secondary throttle valve actuator
c29 secondary throttle valve position sensor
c31 gear position signal switch
c32 injector signal #1 for rear cylinder
c33 injector signal #2 for front cylinder
c41 fuel pump control system, fuel pump, fuel pump relay
c42 ignition switch signal, anti theft
c44 heated oxygen sensor
c49 pair control solenoid valve
This will at least tell you what electrical or sensor issue the computer is seeing.
The thing that stands out to me is you did a compression check and you got 150 from one cylinder and 110 psi from the second. Correct? If so, you have a serious compression issue. The service limit for the engine is 158 psi.
I would STRONGLY suggest running the compression test (on a warm engine) and take the readings again. If you have the same results, you are looking at a complete rebuild of the engine. It could be any number of reasons. Stuck or broken ring, worn cylinder, worn piston, burnt valve, broken valve. Or any combination of the above.
Once you have compression resolved, then it is a matter of air or spark. You can troubleshoot the spark issue by swapping plugs, wires and even coils to see if the problem remains on the front cylinder or if it moves with the component. If it continues, then it could be electrical (ECU) or other issue.
I really wish you luck with your bike. This does not sound like it is going to be easy to resolve.
Current Bikes ---->
- 1969 Indian MX125 -10-2009 to Present
- 2006 Star Virago - 05-2011 to Present
- 2014 Honda CTX1300 - 05-2015 to Present
Past Bikes -------->
-1973 Yamaha RD350
-1991 Harley Sportster 883 XL
-2000 Yamaha XV125
-2003 Piaggio Fly
-2004 Suzuki LS650
-2005 Boulevard C50 - 07-2008 to 5-2012
-2012 Vulcan 900 05-2012-05-2015
-2008 Yamaha FZ6 - 11-2008 to 04-2017t