I've got a '99 with a PC2 and 38k on it. It used to belong to Vern (xrated). Great bike, has been well taken care of. But lately, the last month I'd say, I keep getting the FI light with more and more regularity, especially when I ride in the rain. Which would make me suspect a connection or wire. The code is always 25, the knock sensor. I've checked the connections from the PC2 to the ECU, I've done the '99-'00 wiring loom fix, I've left the neg cable off the battery for 15 minutes. The FI light comes after about 10-15 minutes of running. I can feel it effect the performance of the bike. It's a noticeable loss of power when your cruising along at a steady throttle.
Anybody have any suggestions as to what I should try next? I'm pretty handy and do all my own maintainence, so I'm willing to give most any idea a try. Is there some wiring I should check, or is it the sensor and I should just replace it? I've also downloaded the manual but I haven't found the sensor yet. I usually burn 87 octane and haven't tried any higher grade to see what that would do.
Thanks in advance for the help.
UPDATE: I found the knock sensor location on the engine under the gas tank. Details are on page 40 of chapter 1 in the manual, if anyone else is interested. Also found part # and price for new one from Ron Ayers.[attachmentid=2922]