GRiSO Out of order - Another battery story

Problem solved. Installed the new battery. Push the magic button and motor cranked.

Thanks everyone for your help. Learned a lot with this.

Richard wrote:

There is another technical data sheet from Moto Guzzi that is more in relation with the 14 gauge / 2mm2 wire modification. My GRiSO has already this modification done.

MG recommend this due to difficulty to start the engine when warm/hot.

Here is attached the document. I guess it is self explanatory. I can translate if needed.

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Richard, could you please translate that, I would really like to see what they have to say
I am particularly interested in Startus Interruptus
I note even in this article they still don't draw the starter item 25 correctly with two coils.

Thanks
Roy

No problem Roy. I’ll do that for you. Stay tuned.

Here we go. Web translated. Hope it makes sense 

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Hey, translated into "startus interruptus" fix.

Well.. I have a pair of GRiSO.. and they both love to ruin the batteries.. even if they are kept on a smart charger.  Some of my other bikes have batteries 10 years old on the same sort of chargers with no issues if you can believe a battery would last that long.. its true..

But I think the GRiSO can kill the battery because of its angled disposition in the bike... I think that leaves the top rear corner of the plates to be not immersed in acid and free to oxidize and as such the life goes way down.  My bikes with vertical batteries do tend to last much longer.  

So i would say remove the battery and leave it on a smart charger if the bike is to be stored for any length of time.

I expect that this subject is in reference to Absorbed Glass Matt batteries or abbreviated as AGM battery type.
I have experienced these mentioned conditions many times. That being, having what appeared to be a fully recharged battery only be partially recharged.
The fault being that AGM batteries require a charge voltage of 14.8 volts to achieve a full charge. A conventional battery charger that will work properly on a Flooded Cell Lead Acid battery will not fully charge a AGM battery.
I reviewed a few You Tube videos to provide a few Links. I was not impressed with that info and choose not to recommend poor quality instructions and recommend that the readers assess all information and use the manufactures instructions when possible.
I personally use chargers that are designed for AGM batteries for all of my industrial machines. For my seven motorcycles I used a variable DC power supply set at 14.8 volts to charge all AGM batteries. When convenient, to keep within the manufactures recommended charge current levels, I lower the initial voltage to a lower level to maintain a more appropriate charge current of 1 to 2 amps then gradually raise the charge voltage to 14.8 volts. When DC power supply current output drops 0.1 amps, or 0.0 amps the battery is fully charged.
I have found that disconnecting the batteries of less often used bikes more convenient than having to recharge those batteries before use.
Discovering this information has saved me a small fortune and much frustration from battery fiascos.
Move Dirt

Im still on the original battery(09 8v GRiSO),34000m,kept on an optimate smart charger,still going strong(shouldnt have said that).cheers pat

Why Moto Guzzi aren't as reliable as the Japanese motor bikes regarding electrical wiring 

They have good engineers over there too but they have only one Luigi 

Richard wrote:

Here we go. Web translated. Hope it makes sense 

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Thanks for the translation Richard.
Problem - Failure to start when hot
Cause - Insuficient wire cross section etc etc
I think they are referring to the wire from the relay to the solenoid, that is what I found on my 07 GRiSO, I increased the wire size to 18 Gauge and found the starter engaged 3 x as fast.

The real problem IMHO is Luigi, he doesn't understand that the inrush current is around 40 Amps, not 10
He might understand if he drew the solenoid with its two coils, I have yet to see a Guzzi drawing that shows it correctly
Both the Valeo and Bosch starters have had 2 coils forever.

A friend gave me a solenoid which I stripped down, here are the two coils
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Here is another thread I started on the subject.
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