It’s a relatively easy fix - maybe. Drain the gas tank and remove the seat. Disconnect the fuel sensor wire at the connector under the seat. Thread it back towards the tank so it’s free to come out with the tank. Disconnect the fuel line and the vacuum line at the petcock after unbolting the tank from the frame. That way you can lift the tank enough to make disconnecting those lines easier. Then lift and pull back the tank to free it from the rubber grommets in the front. You may need to do a little wiggling. Now place the tank upside down on a soft surface. I have a towel on a sponge pad/mat on my work bench for this purpose. Undo the 4 ten mm bolts holding the fuel sensor in place. There is a big O ring under the plate to seal it. Gently lift the plate and the arm with the fuel sensor on the end, out of the tank. You have to kind of turn it as you pull it out. Do it all gently and you will see how it comes out and goes back in. Once out you will probably see that the whole thing is probably rusted somewhat and the arm may even be frozen in place if yours is reading 100% full. At the end of the arm is the actual fuel sensor mechanism. It is protected by a metal shield. You can pry that off carefully with a cutting knife blade or similar, exposing the copper wires. The sensor works by the contact of the wires to the pickup. You will easily see how it works. It stops working because of corrosion and the pickup arm losing its tension against the wires. You can carefully clean the wires and the pickup. I use sand paper on the pick up, a small nylon brush on the wires if they aren’t too bad. Then re-establish the tension on the arm, a little careful bending so that the pickup is always in contact with the wires. I clean up the whole thing with a wire brush as much as I can. There you go. Put the shield back on, if you can, and reinstall the sensor in the tank. Before you put the tank back on the bike, a little grease on those two rubber grommets makes it easier. graham
On Tue, Sep 11, 2018 at 1:12 PM Kalin Stoyanov <[email protected]> wrote: > Hi guys, > > I recently bough '85 NH650. All is fine but my fuel level indicator all > the time shows 100% full. > Any ideas? > > Shall I try to dismount the fuel tank and to replace it? > > Thank you. > > Kalin > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/nighthawk_lovers. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
