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Thread: Faulty plug wires?

  1. #1
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    Faulty plug wires?

    Still trying to figure out why my bike is backfiring after checking out both the air and fuel system. I tried an in-line spark plug tester and one of my wires isn't lighting up the plug nearly as much as the rest.

    These are both the front one wires/plugs. The two in the back showed the same light as the good one here.

    Good Spark:


    Bad/weak one:


    I haven't managed to get to the front coils but after doing some research on here, I do not think I have the original ones.
    I'll assume they changed all 4 but I have some digging left to be sure. These are the two rear ones (videos are of the two front ones).

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    Spark plugs are brand new Iridium ones. I swapped out the two cables in front (the ones in the videos) and it smoothed out the engine considerably. At this point, am I safe to assume it's just the wire? Or could it be the coil as well?

    For coils, I found https://www.apriliaforum.com/forums/...=1#post4524895 here, post #318 for a list of the coils. However, I haven't found anything for wires. Is there anything that's compatible?

    I was told:
    1.3 Ford KA
    1.3 late 80's Escort
    Fiat Coupe

    I found some for Fiat Coupe but they are 2.0 Turbo and I have no idea if these are good enough as it was made with multiple engines. I am in Canada so most of these cars never existed here. Does anyone here have a list of wires that would be a direct fit?

    Are there any other tests I should do?

  2. #2
    apriliaforum Junkie bkmo's Avatar
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    Fiat brava 1.4 plug wires (HT Leads) is what I picked up off of Ebay from the UK. I didn't see them in the US nor here in Costa Rica.
    2002 Capo Wilbers rear shock, Wilbers front progressive springs, Metal fuel connectors, polaris sh775 series regulator direct wired, silicone vacuum lines, catfish map, CNC clutch slave, autoelectrics coils (2)sides, Triumph Denso 3990's centers, k&n air filter, all LED lighting, SS brake and clutch lines, Givi tall screen, Triumph tiger 955i mirrors, dual horns. Pure copper 4 gauge battery cables. Rox risers.

  3. #3
    apriliaforum Member Swaff's Avatar
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    Your coils are definitely not original and the modifications look a little sketchy IMO. MK1 CapoNords like yours had Sagem coils that were prone to fail. Tons of existing threads on all of this... The '06 - '07 (MK2 CapoNords) used JCI coils that were significantly more reliable. If you want piece of mind and you are in Canada you could likely order some Auto Electrics USA coils on eBay (people have had success with them) and you won't have to modify them like you do with the Renault, Fiat European coils...

    https://www.ebay.com/itm/1x-BRAND-NE...cAAOSwoBtW6Ak5

    If you go that route you would be advised to also order some new leads that you can get from Magnecore:

    https://www.magnecor.com/magnecor1/main.htm

    ***Look in their catalog for "Aprilia" --- they make leads that specifically fit the Auto Electrics coils...

    Have a look at this thread...

    https://www.apriliaforum.com/forums/...r-the-1L-Rotax
    -Swaff
    Seattle, WA
    2007 Caponord

  4. #4
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    Quote Originally Posted by bkmo View Post
    Fiat brava 1.4 plug wires (HT Leads) is what I picked up off of Ebay from the UK. I didn't see them in the US nor here in Costa Rica.
    Are we talking about NGK 2571?
    https://www.ebay.co.uk/itm/1-NGK-Cab...MAAOSw9zdcnX3a

    or

    https://www.ebay.ca/itm/HUCO-Ignitio...9cNgxq&vxp=mtr

    I've seen the Brava 1.4 thrown around but never any part or item number to actually confirm I'd be ordering the proper thing so I'm pretty iffy.

  5. #5
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    Quote Originally Posted by Swaff View Post
    Your coils are definitely not original and the modifications look a little sketchy IMO. MK1 CapoNords like yours had Sagem coils that were prone to fail. Tons of existing threads on all of this... The '06 - '07 (MK2 CapoNords) used JCI coils that were significantly more reliable. If you want piece of mind and you are in Canada you could likely order some Auto Electrics USA coils on eBay (people have had success with them) and you won't have to modify them like you do with the Renault, Fiat European coils...

    https://www.ebay.com/itm/1x-BRAND-NE...cAAOSwoBtW6Ak5

    If you go that route you would be advised to also order some new leads that you can get from Magnecore:

    https://www.magnecor.com/magnecor1/main.htm

    ***Look in their catalog for "Aprilia" --- they make leads that specifically fit the Auto Electrics coils...

    Have a look at this thread...

    https://www.apriliaforum.com/forums/...r-the-1L-Rotax
    Thanks but unfortunately at that price point, I would just sell the Capo for parts. I've had it since April and barely able to put 400 km on it. It constantly has issues and this might be the last straw unless I can find a cheap solution and see that it works.

    I've seen the tons of threads and probably have more than 10 tabs open about it for the 1000 but nobody ever mentions a part number for the wires or HT leads, just general models. They're not easy to find in a country where they never existed. While I'm willing to order them from abroad, I want to make sure I'm getting the right thing.

  6. #6
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    I got to the front coils today and I'm having serious doubts as to what happened.

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    At this point, I'm not even sure if it's a wire or coil issue or both.

    Can a single coil be changed or will it just make it worse?

  7. #7
    apriliaforum Junkie bkmo's Avatar
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    Quote Originally Posted by Funky_Mad View Post
    Are we talking about NGK 2571?
    https://www.ebay.co.uk/itm/1-NGK-Cab...MAAOSw9zdcnX3a

    or

    https://www.ebay.ca/itm/HUCO-Ignitio...9cNgxq&vxp=mtr

    I've seen the Brava 1.4 thrown around but never any part or item number to actually confirm I'd be ordering the proper thing so I'm pretty iffy.

    Those look to be correct, but this is a better option I would think https://www.ebay.com/itm/NEW-SPARK-P...a6c4%7Ciid%3A1

    And yes of course you can replace one coil.
    2002 Capo Wilbers rear shock, Wilbers front progressive springs, Metal fuel connectors, polaris sh775 series regulator direct wired, silicone vacuum lines, catfish map, CNC clutch slave, autoelectrics coils (2)sides, Triumph Denso 3990's centers, k&n air filter, all LED lighting, SS brake and clutch lines, Givi tall screen, Triumph tiger 955i mirrors, dual horns. Pure copper 4 gauge battery cables. Rox risers.

  8. #8
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    Quote Originally Posted by bkmo View Post
    Those look to be correct, but this is a better option I would think https://www.ebay.com/itm/NEW-SPARK-P...a6c4%7Ciid%3A1

    And yes of course you can replace one coil.
    Oh damn, that is a lot cheaper! Thank you!

    They are listed as 7mm though, aren't the capo ones listed as 8mm?
    Or these for sure work?

  9. #9
    apriliaforum Junkie bkmo's Avatar
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    Quote Originally Posted by Funky_Mad View Post
    Oh damn, that is a lot cheaper! Thank you!

    They are listed as 7mm though, aren't the capo ones listed as 8mm?
    Or these for sure work?
    7mm is just fine. I would think OEM wires are 7mm.
    2002 Capo Wilbers rear shock, Wilbers front progressive springs, Metal fuel connectors, polaris sh775 series regulator direct wired, silicone vacuum lines, catfish map, CNC clutch slave, autoelectrics coils (2)sides, Triumph Denso 3990's centers, k&n air filter, all LED lighting, SS brake and clutch lines, Givi tall screen, Triumph tiger 955i mirrors, dual horns. Pure copper 4 gauge battery cables. Rox risers.

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