Spark Plug Wires - Sumax 8mm or SE 10mm - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 14 Old 05-12-2016, 11:43 AM Thread Starter
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Spark Plug Wires - Sumax 8mm or SE 10mm

Hey all, looking for a recommendation between the two options. I'm having an issue starting where the bike wants to stall out at times, I've read that new wires have fixed this issue. It seems that there are a lot of good reviews on Sumax 8mm wires, however HD makes the Screamin Eagle for XG as well which are 10mm. It has always been my impression that fatter is better, can anyone advise which would be the better option. As much as I like the bike, I'm not too fond of HD's aftermarket so far which is why I'm skeptical on whether the bigger diameter would work better than the Sumax 8mm.


Thanks all!
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post #2 of 14 Old 05-12-2016, 12:27 PM
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Here is my argument. Its not How Fat the wires are. Its What they are made of. Look at an older Toyota V6. 3 coil packs in the front. And notice How skinny the wires are that go to the rear cylinders. Sumax also makes another wire for the Street. 8.2mm (I think it was), Its a Racing Wire.
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post #3 of 14 Old 07-13-2016, 04:43 PM Thread Starter
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I ended up purchasing the HD Phat 10mm wires as I've read a few posts from people saying the Sumax wires are too short. I've heard this has been fixed but didn't want to risk it.


I also switched out my spark plugs for NGK Iridium IX plugs. My bike kept wanting to stall when starting cold, which kept getting progressively worse it seemed. I've only had this new set up on for a day but so far I have had zero issues starting up, and the bike seems to run much smoother as well. Not sure if I had bad wires/plugs or a combo of both, but hopefully the performance will keep up for a while. So far I'm happy!
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post #4 of 14 Old 07-13-2016, 06:32 PM
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The Front Cylinder on the Sumax is the correct length. The Rear could be a little Longer. So that the Rear Holder could be used. When the Tech fixed my Rear Cylinder Cover leak, He removed my zip tie. And the wire is just floating under the Tank. Maybe it will be fine.


On a side note: Sumax has Never answered any of my e-mails. Haven't tried calling them because of my work schedule.

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post #5 of 14 Old 07-14-2016, 12:59 AM
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When I got my Sumax wires, they were both way wrong on length as compared to stock, and the rear cylinder wouldn't even slightly reach it was 3" too short. I think the front one was an inch too long. They did answer my email. I had to pay return shipping to them, even though the acknowledged that they knew about the length changing at some point. (Different model year?) They sent me the correct ones. I got neon green ones. They look great. Didn't much care how they'd work, I've never had a sparkplug wire that wasn't worn out completely give me an issue.
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post #6 of 14 Old 07-14-2016, 05:44 AM
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What Number did the send you?? I have the XG202 purchased from Revzilla. Unless they changed it since I purchased?

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post #7 of 14 Old 07-15-2016, 12:47 AM
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I ordered the XG209, when I sent them the package back, they sent me my exact same package back with the correct length wires in it. Wouldn't be surprised if they were simply blowing air up my tail pipe and it was a manufacturing mistake.

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post #8 of 14 Old 07-15-2016, 08:42 PM
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I had the same problem with the rear wire not long enough. It was corrected and they threw in 10mm wires and 4 gauge battery cables to boot after I took picture of stock spark plug wires laid out next to tape measure and their rear cylinder wire in comparison.
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post #9 of 14 Old 07-15-2016, 09:49 PM
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That would have been nice. Heck, I'd have been happy if they just paid my shipping. I REALLY hope they correct their advertising to note the difference. So people can stop buying the wrong wires.

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post #10 of 14 Old 09-16-2016, 02:20 PM
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Can you let is know what NGK Iridium plugs you used? Looking for some as well but can't seem to find any information on it?
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