Based on header temp reading, using a heat sensor gun, the #2 and #3 cylinders on my '06 600 Katana are not always firing. Once the engine is reved it seems the engine smooths out and the temps come up on those cylinders too. I'm fairly confident it isn't carb related since I have vacuum gauges on it and the vacuum is very close on all cylinders once the valves on the gauges are adjusted to get rid of almost all of the needle bouncing.
I realize #2 and #3 share a common coil, but am a bit confused how a bad coil would give intermittent failure. I'm going to replace the spark plugs (like I routinely do on most older bikes I've bought) and check the plug caps. In the meantime is there something else that I'm overlooking that might cause a cylinder, or cylinders to "drop" intermittently, particularly under 4,000 or 5,000 RPM?
Thanks, in advance.
Lynn
I realize #2 and #3 share a common coil, but am a bit confused how a bad coil would give intermittent failure. I'm going to replace the spark plugs (like I routinely do on most older bikes I've bought) and check the plug caps. In the meantime is there something else that I'm overlooking that might cause a cylinder, or cylinders to "drop" intermittently, particularly under 4,000 or 5,000 RPM?
Thanks, in advance.
Lynn
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