welding on bike - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 13 (permalink) Old 03-16-2014, 04:49 PM Thread Starter
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welding on bike

While doing some work to sons bike, we need to cut off an old tab off his crash bar build a new one and reweld it in a different location for a cleaner look, we disconnected the negative cable, but after reviewing the wiring diagram fear we did fry the cdi module, started fine when we parked it, now it wont start, we got it to fire and run for a few seconds then dies, sounded like it might have been running off 1 cyl, anyone else experience any issues welding on a bike, Wish I would of unplugged the cdi like I first though now.
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post #2 of 13 (permalink) Old 03-16-2014, 05:15 PM
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While not the mot knowledgeable person on this site with the electronics I do know welding on a car will often burn the CDI. Don't see why it would be any different on your bike. It's possible you got your coils too.

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post #3 of 13 (permalink) Old 03-16-2014, 05:27 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by FoolAmI View Post
While not the mot knowledgeable person on this site with the electronics I do know welding on a car will often burn the CDI. Don't see why it would be any different on your bike. It's possible you got your coils too.
Unknown - Sorry, No help here....

I once had Welding done on a Class B (-6 wheel) truck lift gate...I disconnected both battery terminals -Pos & Neg. (completely isolated electronics - how much does a Diesel have ? with a batter powered boombox for a radio...LOL) -had no issues.


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post #4 of 13 (permalink) Old 03-16-2014, 06:48 PM
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very possible you fried the CDI, as it ground out through the engine and frame as well as the battery.
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post #5 of 13 (permalink) Old 03-17-2014, 07:17 AM
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Yup. I learnt the hard way about welding on a bike.
Should have disconnected all electronics to be safe.
Only takes a second to disconnect the junction box, battery & such.
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post #6 of 13 (permalink) Old 03-17-2014, 08:02 AM
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I hope I didn't do the same thing....

How can you check Che coils and cdi ? Continuity tests? I think slim might be able to help here
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post #7 of 13 (permalink) Old 03-17-2014, 08:16 AM
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Just found the electrical resistance chart in the manual for testing coils and igniter. Sigh...
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post #8 of 13 (permalink) Old 03-17-2014, 11:43 AM Thread Starter
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I doubt you have any coil issues, not something that would generally be affected. cdi yes, would think it would mostly be isolated to that.
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post #9 of 13 (permalink) Old 03-17-2014, 01:01 PM
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Guess I got lucky by taking the tach bracket to the vise for welding.

I've had pros tell me both ways, disconnect the battery, and it doesn't matter. One old sage did say that if your welding ground lead shares ground with a component, it can get fried.

My welder is Korean War surplus, maybe WWII, so I don't take chances.

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post #10 of 13 (permalink) Old 03-17-2014, 01:23 PM
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Quote:
Originally Posted by Spockster View Post
if your welding ground lead shares ground with a component, it can get fried.
I agree.
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