Spark Plug Wire Lengths - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 18 Old 04-22-2015, 07:50 PM Thread Starter
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Spark Plug Wire Lengths

I ordered some Taylor made 8mm orange spark plug wires XG208 by Sumax from a well known online parts dealer. The long wire is only 16.5 inches long. My stock wire for the rear cylinder is 19 inches long. A tech at Sumax is telling me he had the stock rear cylinder wires pulled from both the street 500 and 750 at his local dealership and claims they measured 16.5 inches in length. The same as the product. I have a pic that shows differently in comparison.

The parts dealer will take back the orange wire returned via UPS with return sticker provided in my order. But before I do that I just want to make sure there isn't a discrepancy in wire length of of stock set vs after market set.

I decided to order another rear spark plug wire from my dealership just in case I might have inadvertently damaged the stock one I have during removals.

Has anyone else measured their spark plug wires be it 500 or 750? If so any input would be appreciated.

Mark
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Last edited by Solo750owner; 04-22-2015 at 07:55 PM. Reason: Forgot to include the pic
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post #2 of 18 Old 04-23-2015, 12:51 PM
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Originally Posted by Solo750owner View Post
I ordered some Taylor made 8mm orange spark plug wires XG208 by Sumax from a well known online parts dealer. The long wire is only 16.5 inches long. My stock wire for the rear cylinder is 19 inches long. A tech at Sumax is telling me he had the stock rear cylinder wires pulled from both the street 500 and 750 at his local dealership and claims they measured 16.5 inches in length. The same as the product. I have a pic that shows differently in comparison.

The parts dealer will take back the orange wire returned via UPS with return sticker provided in my order. But before I do that I just want to make sure there isn't a discrepancy in wire length of of stock set vs after market set.

I decided to order another rear spark plug wire from my dealership just in case I might have inadvertently damaged the stock one I have during removals.

Has anyone else measured their spark plug wires be it 500 or 750? If so any input would be appreciated.

Mark
Can we assume that the 16.5 inches long wire is too short and won't work? I haven't measured the wires on mine so I really don't know.




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post #3 of 18 Old 04-23-2015, 07:08 PM Thread Starter
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That is correct assumption Stonefree
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post #4 of 18 Old 05-05-2015, 06:49 PM Thread Starter
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I have an update about the Orange Spark Plug wires. I have been working with an individual name Kirk at Sumax by taking pics of my
bike with the Orange plug wires. He agrees with my assessment and will be changing the length of the rear spark plug wire (16 1/2 inches) (Front cylinder wire is ok) to match the length of the stock wire (20 inches long) and I will be getting a free set or wires for my troubles. This means he will be repackaging the wires so no one else will have deal with this issue concerning Taylor Made wires from Sumax.
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post #5 of 18 Old 05-08-2015, 06:40 AM Thread Starter
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Great News Here!

Yesterday I received the longer version of the Orange spark plug wire. In addition to receiving the longer wire, a pack of Orange ThunderVolt 50's (correct length) and a set of 4 gauge battery cables. The Customer Service I received was well beyond what I had expected from
Sumax. Sumax was very appreciative of me letting them know that their spark plug wire product needed updating. Will post pics in
my next post....Off to work I go.
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post #6 of 18 Old 05-08-2015, 10:31 PM Thread Starter
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As promised, here is the pick of the new wires and battery cable. My cat decided to be in the picture looking important.
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post #7 of 18 Old 05-09-2015, 06:44 AM
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Share photos when fitted on the bike.... How are the wires? Any issues by far?
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post #8 of 18 Old 05-09-2015, 09:26 PM
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Those are the wires that keep a solid transfer, right? I'd like to know what you think about the performance and if you notice any changes.
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post #9 of 18 Old 05-09-2015, 10:20 PM Thread Starter
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Ok, I have both 8mm Orange Taylor wires installed on the bike. I routed the wire for the back cylinder in the same clips the stock spark plug wire was routed through. The easy part was applying di-electric grease to the metal connectors. I can tell you that getting the wire on the clip under the tank on the coil side of the bike was difficult but I managed. As for the performance of the wire, After riding to a couple of Harley Dealerships today, the engine ran better in a higher gear at low speeds..for ex., 5th gear at 35 mph with no stuttering. Further research is needed to be sure of the performance of the new wires.
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post #10 of 18 Old 05-10-2015, 01:47 AM
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Keep us updated with the wires brah..
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