Main Motorcycle: 09 R3T
Join Date: Jul 2008
Location: Charlottesville, Va USA
Shunternz, the description of your problem sounds exactly like what I’ve been dealing with for the past year. I’ve had my bike back to the shop 5 times this past year and each time they would “calibrate the stepper motor”, declare the bike fixed and I would ride a short time or miles and the problem would return. My bike was doing as you describe and also had an irregular idle. On my last visit, I showed them Warp9.9’s post on this thread and they checked all he suggest but found no issues. They were in contact with Triumph Tech Support each time and each time Triumph led them to the stepper motor.
Reading post in another Forum, R3owners, I found that early models had a somewhat similar problem but it dealt mostly with high idle after the engine was hot; however, one suggested cure within one of those forum threads was to remove and clean the Crank Shaft Position Sensor. After seeing that comment I referenced the service manual (page 11.16) and realized how important this sensor is to timing fuel ignition. So, I pulled that sensor and cleaned it. My bike is now idling and running properly. This issue started on my bike after approximately 24,000 miles. The sensor didn’t visibly seem dirty when I pulled it but after wiping it with a clean white rag, the rag showed a light film of what I would describe as, carbon black. I’m going to make it a routine to clean this sensor each time I change oil.
I thought I add this post in case it might help someone else down the road.
Last edited by neb; 05-14-2013 at 12:32 PM.