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Odd issue with rev counter on 1100 Sport Injection 1997

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paulcopes90

Just got it firing!
Joined
May 12, 2024
Messages
5
Location
Midsomer Norton, England, United Kingdom
Hi from a new Guzzi owner in the UK. This bike is new to me and first older bike of any kind so a bit of a learning curve. Bike runs fine but I was puzzled by rapidly running out of revs and able to hit the red-line in top gear but only getting to 65-70 mph. I checked the speedo reading with google maps and the speed accuracy is as expected, a few mph high but close enough. Plugged in the diagnostics tool I had from a previous 2011 Aprillia (bit gobsmacked that this worked first time) and confirmed that the rev counter is reading exactly double the real rpm. No ECU faults showing although I did see the wire from the tone wheel has been sitting too close to the exhaust header and is a bit melted but nothing too bad. Been looking in the manual and at the wiring diagram but it's not clear what type of signal the ECU is giving the rev counter. Does anyone know if this is pulses or a voltage level? I'm a test engineer by trade so know a bit about signals and wiring and stuff but can't get my head around how I could have a reading of twice what I should. At least I've got a lot more revs to play with if it ever stops raining!
 
Probably a bad stepper in the tachometer. The ECU itself is a rev limiter so you can safely ignore the tachometer. You can replace the tachometer if still available. It is part number 01767200.
 
Great, thanks. I have some spare clocks in the box of bits I got with the bike so maybe that's a job the previous owner intended but never got around to. At least I can try the other tacho off the bike. Good to know there's a rev limiter but I feel my mechanical sympathy might stop me before that :) .
 
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