Help req'd to diagnose start issue - MVAgusta.net
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post #1 of 54 (permalink) Old 10-18-2018, 11:04 AM Thread Starter
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Help req'd to diagnose start issue

Hi,

Brutale dragster 80 rr my15.

Issue starting, can anyone help to diagnose?


thanks
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post #2 of 54 (permalink) Old 10-18-2018, 12:02 PM
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Your battery is too weak.
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post #3 of 54 (permalink) Old 10-18-2018, 12:11 PM Thread Starter
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Possibly, swapped it out and put a second in and fully charged it. Same thing happened. Could be unlucky to get through 3. A BS one and two yuasa’s. I’ve got a separate charger and will charge the one that’s out. And install it tomorrow to double check
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post #4 of 54 (permalink) Old 10-18-2018, 12:17 PM
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Get rid of the BS battery.

Fully charge one of the Yuasa batteries and install it, or charge the installed battery.

Once the battery has been trickle charge overnight, or preferably for 24 hours, attempt a restart.

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post #5 of 54 (permalink) Old 10-18-2018, 12:56 PM Thread Starter
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Going to install the one currently on charge into the bike tomorrow morning. Fingers crossed.
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post #6 of 54 (permalink) Old 10-18-2018, 02:06 PM Thread Starter
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Battery charged so thought I’d install tonight. Same thing. This is from fresh install

https://youtu.be/s8Ij_yfoQIs
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post #7 of 54 (permalink) Old 10-18-2018, 02:09 PM Thread Starter
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Could it be spark plug related?
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post #8 of 54 (permalink) Old 10-18-2018, 02:14 PM
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Could be.

Do any error messages show up on the dash?

Does the fuel pump prime?

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post #9 of 54 (permalink) Old 10-18-2018, 02:44 PM
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Put your voltmeter across the battery terminal while cranking and observe. (At least to the battery positive, negative meter lead can go to a chassis ground point)

If voltage drops anywhere near 9~10 volts while cranking then you have a weak battery.

Mileage on the bike?? When was last time it ran?
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post #10 of 54 (permalink) Old 10-18-2018, 02:51 PM Thread Starter
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It was run about two weeks ago, got a flat and was waiting for tyre to be delivered. Tried to start to take it down garage and it’s started doing what it’s doing.

No error msgs. Fuel pump primes. 20k miles
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