no spark on Honda Rebel after sitting a couple of monthes - Honda Rebel Forum
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post #1 of 13 Old 01-04-2020, 10:40 PM Thread Starter
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no spark on Honda Rebel after sitting a couple of monthes

My bike (1999) ran fine for six months or so since I bought it but had not had a chance to ride lately and when I got it out last week, motor turns over fine but has no spark on either cylinder.

I've been looking at the ignition system in the service manual and was wondering if there is one of these components that is subject to failure and how to check them. The manual is requiring some special equipment to check voltages which I don't have.

Thanks
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post #2 of 13 Old 01-05-2020, 01:19 AM
 
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engine stop switch in kill position?

pull cdi 2 wire connector, check B/W wire for continuity to frame ground
with Ignition switch On, Kill switch in Run position..
You should have no connection to ground as grounding this circuit disables cdi..

without tools I'd disconnect/reconnect all the connections in hopes of disturbing oxidation than may be preventing a complete connection..

you need peak voltage DVA adapter and good multimeter to test exciter and pulse generator coil output voltage..
https://www.amazon.com/dp/B0093U3TFG

Old school 1st generation Rebel diagnostic procedure was to measure exciter/alternator and pulse generator resistance while connectors disconnected..
Pulse generator 90-100Ω
Exciter/alternator 270-340Ω
Peak voltage testing is more accurate at finding faults

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #3 of 13 Old 01-05-2020, 08:05 AM Thread Starter
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Steve66

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Originally Posted by SoakedKarma View Post
engine stop switch in kill position?

pull cdi 2 wire connector, check B/W wire for continuity to frame ground
with Ignition switch On, Kill switch in Run position..
You should have no connection to ground as grounding this circuit disables cdi..

without tools I'd disconnect/reconnect all the connections in hopes of disturbing oxidation than may be preventing a complete connection..

you need peak voltage DVA adapter and good multimeter to test exciter and pulse generator coil output voltage..
https://www.amazon.com/dp/B0093U3TFG

Old school 1st generation Rebel diagnostic procedure was to measure exciter/alternator and pulse generator resistance while connectors disconnected..
Pulse generator 90-100Ω
Exciter/alternator 270-340Ω
Peak voltage testing is more accurate at finding faults
Thanks for the info! Will make these checks. Also found a good thread on this in this forum. I have a friend that works on outboard motors, I think he has a DVA. Will see if I can borrow.
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post #4 of 13 Old 01-07-2020, 05:20 PM Thread Starter
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I was able to get a dva and checked blk/red wire from exciter/alternator where it plugs into cdi, it measured 150v. Manual says 100 minimum. Then I measured at the blk/yellow wire going to the coil from the cdi and i have 0 volts. This was with the blk/yellow wire disconnected at the connector between the cdi and the coil.

Blk/white kill wire at cdi checked open when in neutral, key on, and kill switch in Run.

Is there anything else that would keep the cdi from powering up or do I have a bad cdi.

Thanks

1999 Rebel
Stock condition
5990 miles
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post #5 of 13 Old 01-08-2020, 07:18 PM
 
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what is the output of pulse generator? should be greater than 0.7vac
check between cdi connector blue/yellow wire and frame ground..

if nothing assure you have good ground at pulse generator connector above where it exits case
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96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #6 of 13 Old 01-08-2020, 08:49 PM Thread Starter
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Quote:
Originally Posted by SoakedKarma View Post
what is the output of pulse generator? should be greater than 0.7vac
check between cdi connector blue/yellow wire and frame ground..

if nothing assure you have good ground at pulse generator connector above where it exits case
Thanks man, will check tomorrow and thanks for the diagram. The online manual I got is so blurry i cant hardly read wiring diagrams.

1999 Rebel
Stock condition
5990 miles
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post #7 of 13 Old 01-09-2020, 03:38 PM Thread Starter
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Got 1.43 volts on blue/yellow wire at cdi connector.
got continuity from green wire at cdi connector to frame.
Interlocks are working. turns over in neutral, Run, and key on. Will not turn over in gear.

1999 Rebel
Stock condition
5990 miles
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post #8 of 13 Old 01-09-2020, 04:48 PM
 
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I'm going to read over the entire thread again triple checking
seems like the cdi has failed..
Honda parts is an option,, I bought aftermarket 2nd generation cdi converted my wire harness to accept it.. bought this one cuz I'm cheap https://www.amazon.com/gp/product/B0081TGQ6Y
for a bit more there is https://www.amazon.com/dp/B009XIT7DQ

blk/yellow wire going to the coil from the cdi and i have 0 volts.
assume that was to frame ground,,
Looks like all honda test procedures were performed..

Blk/white kill wire at cdi checked open when in neutral, key on, and kill switch in Run.
blk/red wire from exciter/alternator where it plugs into cdi, it measured 150v.

Got 1.43 volts on blue/yellow wire at cdi connector.

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #9 of 13 Old 01-09-2020, 05:19 PM Thread Starter
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Thanks for sticking with me SoakedKarma, yes, blk/yellow to frame ground. I bought a used cdi on ebay last nite. Hope to get it Saturday. Will let you know results.

thanks again!

1999 Rebel
Stock condition
5990 miles
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post #10 of 13 Old 01-15-2020, 06:04 PM Thread Starter
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Originally Posted by Steve66 View Post
Thanks for sticking with me SoakedKarma, yes, blk/yellow to frame ground. I bought a used cdi on ebay last nite. Hope to get it Saturday. Will let you know results.

thanks again!
Installed replacement cdi and now it cranks and sounds good revving up in neutral. Test drove and it starts misfiring about 2500 rpms in first and will hardly run in second.

A friend hooked me up with another rebel owner here in town and he let me borrow his cdi to try and the bike still had the same problem.

Tried the original cdi just to confirm and bike would not crank, same as before.

Gas tank was near empty so i put a gallon of 92 octane in it, no difference.

So I must have a component that tests good but is breaking down under load. Would the pulse generator be the next one to replace?

1999 Rebel
Stock condition
5990 miles
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