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post #1 of 57 (permalink) Old 10-29-2017, 10:06 AM Thread Starter
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Start Issue - 2008 312

In neutral, clutch in, kick stand up or down, battery is good (verified), fuel pump is primed but starter does not get energized. It starts when I jump the connectors on the starter relay. Assuming that troubleshooting was done, replaced the suspect relay but did not resolve the issue. In neutral, neither the clutch nor the stand switches should matter. If the neutral switch was bad, pulling the clutch would bypass the neutral switch, Same true for the stand. My conclusion is the starter relay is not getting the "signal" to close the circuit to get the starter to spin. When I jump the connectors, starts instantly.
Any technical advice on what to check next. "Take it to your dealer" recommendation is NOT considered a technical advice.

'08 312
'15 K1300S Motorsport
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post #2 of 57 (permalink) Old 10-29-2017, 10:16 AM
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You say "Battery is good"...please define.

When is the last time you disassembled the starter solenoid wiring and cleaned the contacts?
Are your grounds good and clean?

How are the contacts inside your Start Pushbutton?

FWIW, I have a 312R and, if things are up to snuff, I get the same response. Making the bike electrically sound cures the issue.
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post #3 of 57 (permalink) Old 10-29-2017, 10:50 AM Thread Starter
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"Good" as in "good" with regards to battery. As I said, it starts when the contacts on the relay are jumped. Contacts and wires are checked/cleaned when replacing the relay with a new one. Starting with the jump on the contacts on the relay also indicates that all the wiring from battery to the starter is good.
I did not suspect the start button but it should be okay too. I hear a click as I push the start button. Starter relay is not energized to close the contacts to complete the circuit.
Thanks for the reply.

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post #4 of 57 (permalink) Old 10-29-2017, 10:52 AM
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Ok, so there is nothing wrong and your bike is fine.

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post #5 of 57 (permalink) Old 10-29-2017, 10:54 AM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
Ok, so there is nothing wrong and your bike is fine.
Thank you. I am glad I've asked. I have one more question; did you wake up as a douche bag this morning or you always are?
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Last edited by Ruhi; 10-29-2017 at 11:01 AM.
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post #6 of 57 (permalink) Old 10-29-2017, 01:45 PM
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Quote:
Originally Posted by Ruhi View Post
Thank you. I am glad I've asked. I have one more question; did you wake up as a douche bag this morning or you always are?
@Ruhi: you asked for help and I give you what you need to do. You tell me all of that is fine with no qualification other than "gee it works when I do this".

It does not work as designed and I quickly and thoroughly tell you what to check.

You tell me that is not the problem. Well, if that circuit works as designed, then the bike must start and you have no problem.

Perhaps you should develop better diagnostic skills then. I have told you that I have the same bike that has had the same issue. I have told you what cures the issue. Unless your 312R is different from mine, then I'd suggest you take my advice and revisit your circuit from the start pushbutton to the starter motor. There is a great diagnostic diagram in the service manual that leads you down the correct path.

Sincerely,
Le Douche

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'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
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post #7 of 57 (permalink) Old 10-29-2017, 03:47 PM
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I would check the starter button as mentioned. Had the same issue with my bike and had to replace the switch assembly.
They are not very expensive.
Try to be a bit more polite to people trying to help you.
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post #8 of 57 (permalink) Old 10-29-2017, 06:09 PM
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Starter Solenoid failed use one from a Yamaha R6 /R1 they are rated with a 30amp fuse the F4 has 40amp fuse just swap fuses over . The relay is internally capable of 70 amps so will do no problem.

As you say bridging the terminals proves starter circuit after solenoid ok.

The click from the solenoid proves the signal is getting to the solenoid (Can you actually feel the click at the solenoid?)

The no action from solenoid indicates failure of the solenoid.

Just my two penneth. Check out link below.

http://www.mvagusta.net/forum/20-mai...light=solenoid

Keep your MV in good repair: motorcycle boots are not designed for walking.
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post #9 of 57 (permalink) Old 10-29-2017, 06:14 PM Thread Starter
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I had a long reply but since the system logged me out and forced me to reload the page, I lost my text.

In short;
Pushing the starter button activates the relay (solenoid) with the "clicking" sound, I expect the button to be doing what it was supposed to do.
Since, jumping the "B" and "M" posts completes the starter circuit, I expect the grounds and hot connections being complete.

That's all.

And, yes, I agree; there is no need for "head banging" to carry out a civil and polite conversation.
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post #10 of 57 (permalink) Old 10-29-2017, 06:20 PM
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It Is the relay , as bridging the B and M terminals takes the relay out of the loop . If you buy a new relay and fit it it is important that the B and M connections are connected the same way around . Some of the Yamaha relays do not have B and M on the body of the solenoid.

The alternator uses a diode on the starter solenoid you can see it bridging the " switch" section of the solenoid take a pic before dismantling to be 100%.

Keep your MV in good repair: motorcycle boots are not designed for walking.
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