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09-29-2018, 02:09 PM
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Club Chopper Member
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Join Date: Aug 2004
Location: Woburn,
MA
Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
Posts: 684
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Not Ranked
Ignition Dropping Out
Hello Guys,
I've got a question on my Big Bear Chopper I build 13 years ago.
10 years back I put a Crane Fireball Dual fire ignition in with a 3 Ohm Crane Coil
All has been well until recently, I started getting engine misfires, like the ignition would drop out then refire with a violent bang.
I checked for loose and broken wires, checked to see if I was losing electrical power from the battery, checked fuel related issues.
I thought it may be the coil, so I replaced it with the same results.
The only thing left is the ignition module, I'll likely replace it with the S&S Hi-4N since it is similar to the Crane version
Any other thoughts?
Thanks
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09-29-2018, 06:15 PM
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Club Chopper Member
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Join Date: May 2010
Location: Reading,
PA
Bike Year, Make, Engine: 88" ACM Rigid Bobber
Posts: 3,842
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09-29-2018, 06:45 PM
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Know Nothing
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Join Date: Mar 2007
Location: Alta Loma,
Ca
Bike Year, Make, Engine: 06 BBC DA...
Posts: 3,781
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13 years sounds like a good run for your ignition.
I kick myself all the time for selling my BBC. I really liked that bike
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09-29-2018, 10:03 PM
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Club Chopper Member
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Join Date: Nov 2014
Location: Shreveport,
la
Bike Year, Make, Engine: 2004 Ultima Chopper
Posts: 931
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How did you check electrical power? Best way would be to put your volt meter hot and ground leads directly on the input to the module and check to see if your meter blinks when the engine cuts out.
that would tell you if you are losing power to the module...loose wires... If all reads good, then put your meter on the output of the module ..ohms.. the module grounds the coils.. and see if the module is puking ...
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2004 Ultima 127 Chopper
1975 Harley Davidson Shovel head Chopper
Shreveport Louisiana
Last edited by Shovel52; 09-30-2018 at 08:19 AM..
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09-30-2018, 09:21 AM
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Club Chopper Member
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Join Date: Aug 2004
Location: Woburn,
MA
Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
Posts: 684
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Not Ranked
Quote:
Originally Posted by Shovel52
How did you check electrical power? Best way would be to put your volt meter hot and ground leads directly on the input to the module and check to see if your meter blinks when the engine cuts out.
that would tell you if you are losing power to the module...loose wires... If all reads good, then put your meter on the output of the module ..ohms.. the module grounds the coils.. and see if the module is puking ...
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Thanks for the input,
I observed the tach continuing to read during the misfires, so I assume the power is getting to the module
Checking the module output is a good suggestion, however the drop out only occurs intermittently while RIDING the bike. I can run through the rev range on the kickstand with no misfire
I do notice that the timing LED appears faint and doesn't seem to be flashing at idle.
I tried to use the static timing method to get the LED to turn on while rotating the engine over by hand with the ignition on - NG
I ordered the S&S Module as a last resort.
Thank you
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09-30-2018, 11:17 AM
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Club Chopper Sponsor
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Join Date: Aug 2004
Location: Central Florida,
FL
Bike Year, Make, Engine: Custom
Posts: 13,613
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The cranes were famous for that. I like the newer S&S version. I can sell you one if you need it. I keep them in stock....
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John
Scooters Performance
31615 Long Acre Dr
Suite 104
Sorrento, FL 32776
www.scootersperformance.com
(four0seven)330-2056
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09-30-2018, 12:45 PM
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Club Chopper Member
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Join Date: Nov 2014
Location: Shreveport,
la
Bike Year, Make, Engine: 2004 Ultima Chopper
Posts: 931
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Not Ranked
Your symptom sounds identical to mine when my ground wire nut loosened up..It would only do it at a certain rpm when I was losing ground...Yours sounds more like the module..
__________________
2004 Ultima 127 Chopper
1975 Harley Davidson Shovel head Chopper
Shreveport Louisiana
Last edited by Shovel52; 09-30-2018 at 12:48 PM..
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10-01-2018, 10:51 AM
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Club Chopper Member
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Join Date: Aug 2004
Location: Woburn,
MA
Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
Posts: 684
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Not Ranked
Thanks for the input guys
I have the S&S unit on order, I feel a little better since you guys seem to agree that may be the way to go.
I'll keep you posted
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10-17-2018, 04:16 PM
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Club Chopper Member
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Join Date: Aug 2004
Location: Woburn,
MA
Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
Posts: 684
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Not Ranked
Back in the Fire
I installed the S&S HI-4N and all is good
Got a NIB from EBay for $200
Got it up and running just in time for the Boston to Salem Halloween Run on Sunday
Thanks guys
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