Source for gasket/sleeve for speedometer?

[JonnyO]

Careful what ya wish for. Mine was now I had nothing to repair...
So the fuel gauge light stopped working and I took apart the speedo to verify it was or wasn't the bulb. ( I checked the connection from under the tank to the harness-was plugged in. ) Swapped the neutral light-bulb is good. Problem lies elsewhere.I'd prefer to reassemble the speedo and reinstall the fairing before removing the tank, etc.
Anyway there's a rubber sleep that sits inside the top of the speedo housing that HAD a foam-type portion of it that has rotted out. I'd like to replace it rather than just putting the old one back in and calling "that's good enough".
Anybody understand what gasket I'm talking about and if they're available?
TIA
And yeah, I could just make sure it has gas by the odometer, tyvm. Worst case scenario for me, though.

[bikerphil]

Still available from Yamaha is the speedometer gasket damper, P/N 3H3-83513-00-00 for $27 or make your own out of some weatherstripping.
You can check the circuit by unplugging the 2 prong connector at the rear of the tank and jumping the 2 prongs together (main harness side) with the key on. The light should illuminate.
Your problem most likely is that the thermistor inside the tank is fried.

[oldyam80sg]

Yes still available as Phil said. I bought one on E-bay a few years ago. I thought mine was rotted also-nope just folded onto itself. I replaced it anyway.

[JonnyO]

Still available from Yamaha is the speedometer gasket damper, P/N 3H3-83513-00-00 for $27 or make your own out of some weatherstripping.
You can check the circuit by unplugging the 2 prong connector at the rear of the tank and jumping the 2 prongs together (main harness side) with the key on. The light should illuminate.
Your problem most likely is that the thermistor inside the tank is fried.

Thank you for the part#-very helpful. I'll have to try your suggestion about checking the thermistor. Now I'll have to learn how to do THAT.

[JonnyO]

Still available from Yamaha is the speedometer gasket damper, P/N 3H3-83513-00-00 for $27 or make your own out of some weatherstripping.
You can check the circuit by unplugging the 2 prong connector at the rear of the tank and jumping the 2 prongs together (main harness side) with the key on. The light should illuminate.
Your problem most likely is that the thermistor inside the tank is fried.

Yep. You're right-thermistor bad. Now what? Can it be replaced/repaired?

[bikerphil]

Easiest option would be to replace the whole assembly if you can find one, P/N 3H3-85752-00-00.

I have repaired them in the past, and I don't recommend doing this, it is very finicky taking apart the tamper proof canister that contains the thermistor and soldering in a new one, and then crimping the canister back together.

[JonnyO]

Easiest option would be to replace the whole assembly if you can find one, P/N 3H3-85752-00-00.

Ok. Thank you very much!

[bikerphil]

Yep, it will be hard to find a reasonably priced NOS unit, could also be hard to find a good used unit.

[JonnyO]

Yep, it will be hard to find a reasonably priced NOS unit, could also be hard to find a good used unit.

Yeah, you're right. Not having any luck.

[cajun31]

Yeah, you're right. Not having any luck.

Rather then looking for just the fuel gauge sensor search for fuel tanks and they generally have the sensor still attached. Of course you are taking a chance on if the sensor is still good or not. Here is an example of one with the sensor still on the tank. 1981 Yamaha XS1100 Y846) gas petrol fuel tank with sensor | eBay

Here is a new sensor ... might not want to spend this much .. GENUINE YAMAHA PARTS FUEL METER SENDER UNIT ASSEMBLY XS1100RH 1981 3H3-85752-00 | eBay

[DEEBS11]

Yep. You're right-thermistor bad. Now what? Can it be replaced/repaired?

Yes, Andy shows how to do it. BTW, watch the film carefully. When he goes to de-solder the thermistor, it just falls off. This is more than likely the problem with the circuit. He should have measured the thermistor for the 15K ohms at that point just to make sure the component was truly faulty. Might have been a simple cracked solder joint - a very common problem in a vibrating motorcycle with changing environmental temperatures.

https://www.youtube.com/watch?v=L_dm5kJ708c

[JonnyO]

Yes, Andy shows how to do it. BTW, watch the film carefully. When he goes to de-solder the thermistor, it just falls off. This is more than likely the problem with the circuit. He should have measured the thermistor for the 15K ohms at that point just to make sure the component was truly faulty. Might have been a simple cracked solder joint - a very common problem in a vibrating motorcycle with changing environmental temperatures.

https://www.youtube.com/watch?v=L_dm5kJ708c

Hmm. Interesting. Thanks.

[JonnyO]

Rather then looking for just the fuel gauge sensor search for fuel tanks and they generally have the sensor still attached. Of course you are taking a chance on if the sensor is still good or not. Here is an example of one with the sensor still on the tank. 1981 Yamaha XS1100 Y846) gas petrol fuel tank with sensor | eBay

Here is a new sensor ... might not want to spend this much .. GENUINE YAMAHA PARTS FUEL METER SENDER UNIT ASSEMBLY XS1100RH 1981 3H3-85752-00 | eBay

Thanks. Good advice. I'll check it out.

[JonnyO]

Of COURSE...tank was almost empty...and then I just put 3 Gals in it. DANG IT!
But it look like I should first take a look at my thermistor.

[LAB3]

A thermistor as opposed to a rheostat or a potentiometer,
Sounds intriguing, I'll have to look into that one!