Author Topic: Popping Brick, Only kinda runs on Starting fluid?  (Read 6957 times)

Offline Laitch

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Re: Popping Brick, Only kinda runs on Starting fluid?
« Reply #25 on: June 08, 2024, 04:59:32 PM »
About 7.8 Volts DC, between pin 4 and pin 5.
Value is within spec.
DC voltage test on fuel injection control unit plug—multimeter red lead to socket #9, black lead to socket #5, ignition on, starter button pressed. Voltage=?
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline schrocketeer

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Re: Popping Brick, Only kinda runs on Starting fluid?
« Reply #26 on: June 13, 2024, 10:52:03 PM »
10.8 VDC between Pin 9 and Pin 5.

Wondering if there was some Back EMF that came off of the electrically driven "turbo" that snuck back in to the OEM circuit, that had not been properly back-filtered out from the intake induction, electric motor control circuit? The three 8 gauge (or larger) wires turning the motor were hard wired direct to the battery, so I didn't think noise got in after passing back up through the battery?

However, there was an electric motor control speed signal coming off the green/red throttle position sensor wire (I believe).

What brick circuitry could have been whacked from a possibly spurious signal coming in that way?

The owner immediately previous to me rode it for a while, but parked it when it stopped [details sketchy here], and the shop wanted a lot to investigate [maybe bid a high price to discourage immediate previous owner from bringing it in?]

My previous barn find resurrection (3+ years in a shed after had been running) did not seem this complicated to resolve. :-\
  • North Alabama
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Ken  
Current: 85 K100RT, 09 DL650, 16 4RT260, 97 XR100, 70 CT70, 06 YFM400
Past Bikes: 86 K100RT, 85 K100RS, 07 SV1000S, 80 KL250, 99 GS1100, 85 K100RT, 86 VFR700, 91 XR250, 95 VLX600, 86 TRX250, 02 GZ250, 83 Z50R, 78 ATC90, 86 XR250, 79 XR500, 72 AT1, 75 YZ360, 78 DT400, 75 DT125, 73 Trail 70

Offline Laitch

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Re: Popping Brick, Only kinda runs on Starting fluid?
« Reply #27 on: June 13, 2024, 11:55:39 PM »
10.8 VDC between Pin 9 and Pin 5.
10.8V is within spec.
It's time to check resistance from the FICU to the air flow meter plug.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles
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