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V7 850 Stone wouldn't start

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johnno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2022 at 18:52
How old is this bike 
1100 sport corsa , Yam R1, guzzi 650tt rider
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 11 Nov 2022 at 20:10
Originally posted by Andy M Andy M wrote:

The switchgear is $$%#. Open the right hand set and get in there with the contact cleaner.


Early on I had successfully disabled the sidestand switch – replaced it with a wire loop on a plug, where it connects to the loom.

I was so flushed with success and pride of a mod well done, I decided next to have a go at bypassing the fall sensor. This struck me as something else to possibly throw a spanner in the works as it's part of the kill switch circuit.

But the service manual troubleshooting page tells lies. It sez there should be +12V on one side of the kill switch, but there isn't. Nothing. It connects to one pin of the ECU, then the other side of the kill switch connects to another pin of the ECU, and this side incorporates the fall sensor, which also needs 12V and an earth for reasons I don't know. So it seems the kill switch only connects two pins of the ECU together, and I can't detect a Voltage anywhere on those lines, in any circumstances, nevertherless the kill switch works as such, so some kind of communiction must be going through the switch, somehow. Maybe it's a digital signal? Anyway I decided to leave well alone, button it all back up and not mess with it anymore. Ouch

But in light of what I found I learned to flick the kill switch a couple of times before starting, especially a cold start, just in case the contacts have decidied to go high resistance in the interim. Now some people say never operate the kill swich because it wears out the contacts. On the other hand, the contacts should be self cleaning, if they're the sliding type (and they usually are).








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Andy M View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andy M Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2022 at 10:16
If the kill switch connects two pins of the ECU it will pulse a fraction of an Amp at about 4.5 V up either pin when it wants to check the continuity. It's not doing any work, just looking for the same piddly little buzz making it through the switch. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2022 at 17:06
Yes, you have to use a different mindset when ECUs are involved.
Brian.

Better 5 minutes late in this world than years early in the next.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 2022 at 16:11
Originally posted by Andy M Andy M wrote:

If the kill switch connects two pins of the ECU it will pulse a fraction of an Amp at about 4.5 V up either pin when it wants to check the continuity. It's not doing any work, just looking for the same piddly little buzz making it through the switch. 

Best Regards

Andy


Thanks for that! That totally adds up. There was something going on but that only showed on the DMM as a few tens of millivolts DC 'coming and going' (an old Fluke 83 BTW) If I could've been arsed to put an oscilloscape on it I may have been able to see it doing it. Thumbs Up

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Christy Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2022 at 11:51
Originally posted by johnno johnno wrote:

How old is this bike 

It can't be more than 2 years old. The 850 hasn't been out that long. I would take it to a dealer. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2022 at 14:55
Originally posted by Christy Christy wrote:

Originally posted by johnno johnno wrote:

How old is this bike 

It can't be more than 2 years old. The 850 hasn't been out that long. I would take it to a dealer. 


warranty Thumbs Up
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2022 at 20:38
Well, he described it as a V7, nothing more. Also he posted on Noveber 9, came back the next day but not since. So actualy we have no idea which model or how old it is.
Fully agree, if it's still within the warranty period, get it sorted by a dealer.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tommy_dogs Quote  Post ReplyReply Direct Link To This Post Posted: 21 Nov 2022 at 12:06
Thank you for all your responses, and advice.

The ignition cable broke under the ignition.
Fixed as it's still under warranty, otherwise it would have been a £350 adventure.

Thanks again.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Christy Quote  Post ReplyReply Direct Link To This Post Posted: 21 Nov 2022 at 13:46
Originally posted by Brian UK Brian UK wrote:

Well, he described it as a V7, nothing more. Also he posted on Noveber 9, came back the next day but not since. So actualy we have no idea which model or how old it is.
Fully agree, if it's still within the warranty period, get it sorted by a dealer.

It said 850 in the title. Glasses on Brian LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andy M Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2022 at 07:53
Originally posted by Tommy_dogs Tommy_dogs wrote:


The ignition cable broke under the ignition.


Glad you got sorted.

Another thing to check though Unhappy

Andy 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2022 at 09:31
You really shouldn't need to check things like that on a nearly new motorcycle.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andy M Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2022 at 17:33
Originally posted by Brian UK Brian UK wrote:

You really shouldn't need to check things like that on a nearly new motorcycle.

Correct, but this is Italian shed-made.
 
If Honda would resurrect the CX650 or Harley would put their engine in a Vincent style frame or Triumph dealers weren't such ****s I wouldn't have to.

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