1955 FL Spark plugs

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RooDog
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Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
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Re: 1955 FL Spark plugs

#16

Post by RooDog » Fri Feb 14, 2020 5:30 am

I use a Bosch Platinum long reach plug I found in my junk box left over from something I don't remember in both my $&$ Shovelheads, and my AM 100" Evo. And they have been working just fine for about 20 years, at least that plug number, not the actual old used plugs.
Anybody interested in the Bosch number, just ask here....
....RooDog....



Excalibur
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Re: 1955 FL Spark plugs

#17

Post by Excalibur » Fri Feb 14, 2020 10:07 am

RooDog & FL54,
Please advise plug number. I began studying the subject for consideration. I determined a cross ref for my N12Y is WR9LP. I note it's resistor type.
What ignitions are you using with these platinums and what do you see as the benefits. It'd be great to hear your thoughts.
Thanks.

RooDog
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Posts: 1287
Joined: Tue Oct 31, 2017 1:00 pm
Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Custom Built Evo 100" Bagger
Location: Knoxville, Tennessee
Has thanked: 429 times
Been thanked: 442 times

Re: 1955 FL Spark plugs

#18

Post by RooDog » Fri Feb 14, 2020 2:13 pm

I have tried more than a few different plugs, H-D #s 4, 3/4, NGK, Accel, Champion J12-y, & H10, and the Bosch Platinums. Removing and cleaning the plugs in the spring, after being comatose all winter seems to be my normal ritual regardless of brand. Now in both mine and the MCs' golden years I have settled on the Bosch Platinums for all my two and four wheeled vehicles as they just seem to work, and platinum plugs by design generally last a long time, and miles I stumbled on the long reach plugs as I need a starting point when I installed the new $&$ heads on my Shovel and didn't have a recommendation to go by. The plugs were just something I had on hand, they fit the heads, and the motor started and ran, same with my 100" Ultima El Bruto. So for over 20 years I have been satisfied with the German plugs and see no reason to change. Since the Bikes only use two plugs at a time, cost is not an issue.

The long reach, 3/4", Bosch number FR8DP serve me well in those two engines.

On the 1950 Panny I use the shorter WR9FP with points in an AM $65 eBay auto advance dizzy and Dyna Ignition Booster, 12Volt.
The Shovel and Evo both have vintage, out of production, Crane Hi-4 nose cone mounted system.
They all use spiral core resistance wires too.
I hope this is helpful. I just don't get excited about spark plugs, if they work they stay....
....RooDog....

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