No spark random times 85 VTG1100C - Honda Shadow Forums : Shadow Motorcycle Forum
 
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post #1 of 7 (permalink) Old 05-17-2019, 11:22 AM Thread Starter
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Model: Vt1100C
Year: 1985
Location: Windsor, Ontario, Canada.
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No spark random times 85 VTG1100C

Hi guys. I recently acquired this bike and would like to get to enjoying it...lol.

It runs ... at times. Then loses spark. It sounds like the rear cylinder is not firing as regular as the front when it does run. I have looked for loose/corroded/burnt connectors and found nothing. The black/white tracer has power steady right to the coils. I am suspecting the cam or crank sensor may be faulty. If anyone out there has been where I have with this issue, please chime in.

P.S. This thing is heavy to push and my legs are getting tired.

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post #2 of 7 (permalink) Old 05-17-2019, 12:39 PM
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Model: Vt750
Year: 1983
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Supposedly the 1985-86 has a cam sensor that others don't. Hopefully you have a good service manual.



Not sure if you have 2 pulse generators since the Haynes manual only shows one.
But some guys had one of their 2 get hot and quit.

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post #3 of 7 (permalink) Old 05-18-2019, 08:20 AM
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Correct. The 85/86 has two pulse genenerators behibd right side engine cover and a cam pulse generator on top of the rear cilinder on the right side. If you have the workshop manual, there are specs to check if they are okay.

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post #4 of 7 (permalink) Old 05-18-2019, 10:42 AM
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These are the pages from the manual

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post #5 of 7 (permalink) Old 05-19-2019, 01:01 PM Thread Starter
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Model: Vt1100C
Year: 1985
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What manual is that? Is it the Genuine Honda Factory Service manual? If so, where can I get a copy? PM info if you like. Email is [email protected]

Thanks in advance. And thanks for the pics. The manual I have is aftermarket and doesn't show everything. I have the genuine article (digital) for my other CM's and CB's and would really appreciate a link to genuine Honda one for this bike.
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post #6 of 7 (permalink) Old 06-17-2019, 10:29 PM Thread Starter
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Thank you to all that posted. I ran it on the lift for a time and waited for it to quit. When it did, I quickly took out my ohm meter and took a reading from blue to blue/white and got zero ohms. Bingo! Ignition pulse generators were shorting out when hot. I scoured the net and found a used one for $149 USD. Problem solved.
To access the wires behind the clutch, I needed to fashion a six pronged socket to remove the clutch nut. I went to Autozone and bought one of their 1-1/8" sockets and put my angle grinder with a cut off disc in it in the vise and took out every other 'point' of the 12 point socket. I ground the tabs to the same width as the slots on the clutch nut and ground down the point on the inside diameter of the socket to fit the nut.
I hope this thread helps someone else in the same boat as I was.
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post #7 of 7 (permalink) Old 06-17-2019, 10:46 PM
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Good to hear it is running again. Thanks for the update, it should be good info for the future.
Good job on making the tool you needed also !
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Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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