Clock/trip/mpg Keeps Resetting…??

There should be setting that automatically resets the tripmeter, mpg, etc. after refuelling. The OM should tell you how to change it to manual reset only.

 

Sounds like a bad connection to me where the units supply is lost i.e. similar to when you have a flat battery and then power is restored. The default here of the clock would be 00:00 so I think that's a confirming clue.

When it resets are the handlebars being unconsciously waggled about like when on and off the sidestand?

Check around the headstock and pay note to certain movements as this may help the detection of the issue.

 

Bad earth connection on battery? Had that myself before, would occasionally reset clocks when starting bike, until it got to the point where it wouldn't even start and I investigated. Could also be dodgy battery. Either could cause voltage to ECU to drop and make it forget it's settings.

 

Matt had the same problem on my Thruxton. It was the live battery connector the was only very slightly loose on my bike. I tightened both the live and earth connections and touch wood it has been fine.

 

For my problem it was just a case of tightening the bolt on the battery terminal the first time. Another time it was the other end of the negative lead where it bolted to the engine.

Not quite sure what bike a Truccy 1200 is (Thruxton?) but I have a 1200 twin and the earth lead is bolted to the left of the engine just to the top right of the crank case cover (as viewed from left side of bike). On my Speedmaster, this is an exposed bolt with thick wires and I ended up removing bolt, cleaning connector terminals and reassembling, with a coat of grease afterwards.

As a first test, you could see if you can find the bolt and see if it wants to tighten a smidgin.

P.S. On my engine, the wires connect with a bolt to a tiny steel bracket which is itself bolted to the engine. I only removed the bolt holding the wire connectors, not the bolt going into engine casting.

 

As it so happens, just had this issue occur again today. Initial start of bike at home seem to half stall for a second, then after filling up at local petrol station, starting stuttered and the time and trips had reset.

Will check things tomorrow when I've got some daylight. And put the battery on my Optimate too. (I bought it 4 years ago, might as well finally put it to some use. )

 

I was told by my mate who fitted a lithium battery to his bike, that they sometimes need waking up if it is cold or not been used for awhile. He said that after turning the ignition on he had to turn his lights on for 30 seconds, then switch the ignition off and back on, and then it would start as normal.

 

My 2018 Bonneville just started doing this infrequently… but it always fires up without a problem. And I have noticed that over the last three days, it had done it twice. And I ride this bike daily. And to be honest, I just thought, my phone tells me what time it is, and the main odometer remains functioning, so all the bells and whistles I can do without. Heated grips work, as does the blinkers, and other things. So I decided it wasn’t worth the time as long as the bike fires up and goes down the road.

 

Yes sometimes you need a Fluke with these problems, I have two; good tools.