Yamaha YZF 600R Thundercat 1996 Rpm Problem

[mjrserrano]

I have a Yamaha YZF 600R Thundercat from 1996, and I have a problem with the Rpm reader.

When I turn the key on, the pointer rises to 8,000 Rpm and then comes to 0 Rpm, and so on.

When I turn on the engine, the pointer rises to 8,000 Rpm, then comes to the effective rotation of the engine, and then returns to 0 Rpm, and so on.

Does anyone know what the possible problem is?

Thank you.

[Nobby the Bastard]

[xX-Alex-Xx]

Did the clocks normally do a full sweep of the gauges when they first get power? Sounds like a bad earth (possibly within the gauges itself).
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DILLIGAF

[mjrserrano]

[Nobby the Bastard]

So is it driven by a physical connection from the gearbox or electric?

If physical, replace the cable.

If electric, there should be 3 wires to it.

1) Earth
2) 12v reference current
3) actual variable voltage that changes depending from close to 0 to 12v, depending on the engine speed.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Easy-X]

A quick google search

https://www.bikechatforums.com/viewtopic.php?t=143077

In fact you could go as far as:

https://www.google.com/search?q=yzf600r+thundercat+rev+counter+site:www.bikechatforums.com

tl;dr it is an error code.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[weasley]

Yep - fuel level sender error. The connector under the tank could be disconnected or corroded, or the bulb in the dash could be gone. Safe to ride as it is but you won’t know when the fuel level gets low.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[mjrserrano]

[mjrserrano]

I want to thank you for the tips you gave me.

The problem is solved.

I got along with shoemakers instead of mechanics, and that's what happened.

These problems occurred after I took my bike to the mechanic to replace the fuel filter and do the maintenance leftover.

After the tips they gave me, I disassembled the part of the tank to gain access to the electrical wiring, and found that the connection of the fuel warning system was disconnected.

As if that's not enough, I noticed that I also had the connecting tube to the air filter box disconnected.

A very bad mechanical service.

I don't know anything about mechanics, but just looking at the wiring and the tubes I checked as soon as they were disconnected.

Once again, thanks for the tips, which avoided me a new trip to the workshop and made me save a few euros.