Question about 1984 Yamaha FJ 1100

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1984 FJ1100 tach works fine until it gets around 3000rpm then kinda starts bouncing around also when this happens the fuel gage starts to drop down. Bike runs fine no problems, I have replaced the CDI and checked wiring. When the gages are out of the fairing and not near the bike no problems but put it near the top front of the frame and it starts........

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Is a sign that the alternator is worn out. Rebuilt the alternator.

Posted on Oct 04, 2009

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Speedometer or fuel gage?

If speedometer which is bouncing around, it is likely a bad ground near where the speed sensor wire harness (which connects the speed sensor to the rest of the "network") exits the transmission housing. It's at the very back of the transmission (you have a 4T60E trans) to the left of where the right side half-shaft leaves the trans housing. Just look for damaged wires. If none, replace the speed sensor for $50-60.

If it is the fuel gage, the sensor is probably not "zeroed"--it's reading wrong, too high, and if it were to start at true "empty", it would read right. Thus, the gage is always reading a little high (maybe a 1/8-1/10th of a tank too high?). This isn't a problem until to stop, start, or turn quickly and cause the fule to slosh around in the tank and starve the in-tank pickup which sends fuel to the engine.

If it is the fuel gage, you should simply put as much fuel in as you can and see if the needle goes far above "F". If it does, note how far it went and then practice filling the tank when the needle is that same distance above "E".

Hope this helps.

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