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Old June 27th, 2016, 06:02 PM   #1
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strange starting question

So it seems my ricks hotshot mosfet rr gave out 2 months outside the 1 year warranty period. I've seen a few other instances of this. I'm 90% sure this is what it is.

I was riding along at 50mph and gave it more throttle and the engine suddenly stopped firing. the dash did not flicker or do anything weird. I coasted to a stop and the bike would start up for a second and shut off again.
Had a friend tow me home.
Today, I tried starting it again. when i first turn the key, voltage is normal at 12.4v sitting. when i cranked it today, it wouldn't fire up at all and would just keep cranking and cranking and not stopping as it normally does. Voltage dropped to 10.2v while cranking. this is obviously indicative of a dead cell in the battery.


Now, my question is: do these bikes keep cranking if the battery is low? Normally, if the bike doesn't fire up, it'll stop cranking after so many turns. I don't have any codes on the dash and have not yet hooked up my laptop to the diagnostic port.
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Old June 28th, 2016, 07:25 PM   #2
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update. so i scanned for codes with jpdiag and got nothing other than cps which is normal if the bike doesn't start when cranking.

any suggestions?
would a bad battery cause it to continuously crank? It seems i probably have a dead cell but all the others are strong so it holds at 10.2v when under cranking load.
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Old June 30th, 2016, 12:33 PM   #3
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I have never seen a bike stop cranking after a certain number of cycles.
10.2V at the battery when cranking may not be enough to the rest of the system. i would suspect the regulator before I held the battery accountable.
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Old June 30th, 2016, 01:34 PM   #4
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Quote:
Originally Posted by gunther19820 View Post
I have never seen a bike stop cranking after a certain number of cycles.
10.2V at the battery when cranking may not be enough to the rest of the system. i would suspect the regulator before I held the battery accountable.
the 848/1x98's stop cranking after a certain number of revolutions if the bike does not start. They all do this.

I'm thinking the regulator died and took the battery out with it. It seems the battery has a dead cell. I can charge it and it will take about a 2Ah charge but will still result in a large voltage drop when cranking. A better Mosfet regulator arrives tomorrow.
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Old June 30th, 2016, 02:38 PM   #5
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Check connections.... Especially grounds at engine and ECU.
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Old June 30th, 2016, 06:52 PM   #6
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Checked grounds. They are fine and i have the wiring upgrade. It cranks very strong with the new battery. It fired a few times on the horizontal cylinder as it is slightly warm. Nothing from the vertical. Getting a p0352(vertical coil) code in jpdiag bit no codes on the dash. Going to check for spark
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Old June 30th, 2016, 07:02 PM   #7
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OK false alarm. Both cylinders fire but it dies after a few rpms
Not sure what else to check. It does it every time I try to start it
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Old June 30th, 2016, 07:13 PM   #8
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The battery was fully charged with a battery charger. Should the bike run for a bit without the rectifier plugged in or does something need to be bypassed?
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Old July 7th, 2016, 09:43 PM   #9
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Will the bike stay running with a battery charger on it?
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Old July 10th, 2016, 01:37 PM   #10
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Will the bike stay running with a battery charger on it?
turns out the issue isn't fixed. got stranded today.
The battery is fine. charging system is fine. there is a wire shorting out somewhere. the dash and lights stayed on strong and the engine just shut off.
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Old July 10th, 2016, 04:35 PM   #11
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What about fuel filter or air lock in the tank?
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Old July 10th, 2016, 05:26 PM   #12
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Engine kill switch on right controls?
In JPDiag, how about TPS? Mine was bad long before it threw a code. I could tell what it was from how it felt. But if I was idling and it quit?... Not so sure.
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Old July 10th, 2016, 05:59 PM   #13
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Checked the fuel filter and hoses by pulling out the base. No issues there. Definitely getting fuel. I can smell it out the exhaust.

Tps is reading correctly and smoothly in jpdiag.


I get the normal CPs code when the. Bike doesn't start on the first try. But now I'm getting a new code. P0505 idle control system malfunction. I think there's a pinched wire somewhere.
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Old July 12th, 2016, 10:08 PM   #14
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i once had a cut in the horizontal coil cable (sparkplug cable) when it got pinched by the rectifier heat shield (behind the battery bracket) causing it to short out intermittently...
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Old July 13th, 2016, 02:50 PM   #15
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i once had a cut in the horizontal coil cable (sparkplug cable) when it got pinched by the rectifier heat shield (behind the battery bracket) causing it to short out intermittently...
hmm I'll have to check that. I noticed it must be a wire that the cps cable touches when i tuck it in but it's not the actual cps or the cable since i changed it out.
Thanks for the suggestion.
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