- Joined
- Apr 11, 2010
- Messages
- 18
About 1000 mi. ago I noticed the left cylinder of my '08 1200S is running about 50° hotter than the right cylinder. I checked the temp. after noticing different header color after a particularly long, fast ride in near 100°ambient.
The bike has 5000 mi. on it and I feel reasonably confident that I would have noticed the differing header blueing had it been there before but can't be sure. In earlier miles the bike was put through longer and faster rides in even hotter weather and even a bit of track time and I don't think the the headers were showing different colors.
Except for an ECU re-flash from Todd, the engine is stock. (No Todd, I have not gotten around to installing the PCV and Autotune yet). Cyl. temp. disparity was occuring before ECU re-flash. I have the PCV and Autotune but have held off installation not wanting it to mask some mechanical problem.
I'm checking the temp. with an infra red at the exhaust port finning. Ambient temp. for tests have been 85°-100°. The left to right disparity is always 35°-50°- regardless of engine load used for test. High reading recorded for hot cylinder: 340°; cool cylinder 295°. As this represents roughly 25% of the ambient temp./working temp. differential I'm thinking it is significant enough to say that there is something amiss.
TPS has been reset using VDST. Valves are adjusted (toward tight side of specs.) Throttle bodies are synced. Cylinder leakdown tests a perfect 100% for both cylinders (yes, I'm sure it's leaking some, but not enough to register on my Snap-On tester)
Do I have a problem?
Could it only be a fueling or timing problem or could it be something mechanical?
Since I think it is a new problem I tend not to suspect cam timing (cam mfg. defect) but......?
Could the installation of the PCV and auto tune correct?
How could the PCV and auto tune correct when there is only one common O2 sensor?
The bike has 5000 mi. on it and I feel reasonably confident that I would have noticed the differing header blueing had it been there before but can't be sure. In earlier miles the bike was put through longer and faster rides in even hotter weather and even a bit of track time and I don't think the the headers were showing different colors.
Except for an ECU re-flash from Todd, the engine is stock. (No Todd, I have not gotten around to installing the PCV and Autotune yet). Cyl. temp. disparity was occuring before ECU re-flash. I have the PCV and Autotune but have held off installation not wanting it to mask some mechanical problem.
I'm checking the temp. with an infra red at the exhaust port finning. Ambient temp. for tests have been 85°-100°. The left to right disparity is always 35°-50°- regardless of engine load used for test. High reading recorded for hot cylinder: 340°; cool cylinder 295°. As this represents roughly 25% of the ambient temp./working temp. differential I'm thinking it is significant enough to say that there is something amiss.
TPS has been reset using VDST. Valves are adjusted (toward tight side of specs.) Throttle bodies are synced. Cylinder leakdown tests a perfect 100% for both cylinders (yes, I'm sure it's leaking some, but not enough to register on my Snap-On tester)
Do I have a problem?
Could it only be a fueling or timing problem or could it be something mechanical?
Since I think it is a new problem I tend not to suspect cam timing (cam mfg. defect) but......?
Could the installation of the PCV and auto tune correct?
How could the PCV and auto tune correct when there is only one common O2 sensor?