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  #1 (permalink)  
Old 04-10-2005, 11:43 AM
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Location: pittsburgh, pa
Bike Year, Make, Engine: 04 big dog chopper 117 ci
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spark plug problem with a 117 S&S

Does anyone know the spark plug brand/size for a 117 s&s . my BD owners manual says use RN12yc but there is no way they will fit . The ones that were in there before were champion Ra8hc but I don't know what to set the gap at. The bike now wants to backfire and is more difficult to start with the new RA8HC plugs.

Checked the BD website and the S&S site which aint got shit on it.

Any help would be appreciated.

Thanks,

Tom
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Old 04-10-2005, 04:15 PM
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according to big dog you should use RA8HC plugs with .040 gap. if you have backfire issues you might need to adjust gap slightly to get rid of it, try .037 and see what happens
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Old 04-10-2005, 05:14 PM
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I have the 117 with force winder and Martin Bros Medustas. I have a little popping (Back firing) on decel. Would decreasing the spark plug gap reduce the popping? I think I already know the answer, the shorter pipe will always have some popping. The previous post just seems like a logical adjustment, thus my question.
BDMike
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Old 04-10-2005, 06:14 PM
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I've been using splitfire spark plugs SF416D runs great!!!
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Old 04-10-2005, 07:21 PM
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short pipes will pop back on decel. mine does it once in a while with the stock pipe. the smaller gap shouldnt be needed in any case with the 117 even if you change the pipes. it would take a lot more mods to need that fix.
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Old 04-10-2005, 08:12 PM
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autolite 4163 is a motorcycle plug

the 63 is an auto version
it should crossreferrence to any brand

personally, i run the car plugs for a buck, and toss em till it's tuned

i usually run a smaller gap, till tuned ...usually 30...then 35...i can't usually hit 40

higher the comp ratio..the smaller the gap and you got a fairly high ratio: 10.2 to 1

also timing should be at 30 deg for that motor
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Old 04-10-2005, 08:22 PM
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the plugs are the same ones h-d uses in the twin cams and sporty motors. i've used autolite 4164 plugs that last a long time. if you want, go to your local auto parts store and ask for autolite #64. they won't have 4164, that's a motorcycle part number. 64 is the automotive number. get those or go to your h-d dealer and get a set for twin cam/sportster. gap is .040", you shouldn't have to adjust your gap. your carb or timing might need a little tweaking.
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Old 04-10-2005, 08:47 PM
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he is also right on the number...sorry.
i run diff heat range (mountians)
same plug
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Old 04-10-2005, 09:17 PM
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the 117 used in the big dogs has a comp ratio of 9.6 to 1. mild cams with little to no overlap.

they use a crank trigger on these motors and the timing isnt adjustable, its controlled by the EHC. more advance for higher rpms done electronically.

unfortunately they detuned everything, possably for epa requirements and or to help try and smooth out vibrations. it produces less power, but gets better gas milage and will probable last longer, because they arent pushing the motor to its limits.

good and bad for big dog owners. i personally feel it has good power and runs out nice, very smooth ride compared to other big V- twins, but its not stopping me from making some mods to get it closer to its true potential.
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Old 04-10-2005, 10:39 PM
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man that's beyond 50 state legal

this must be big dog's pic, cause the catalogs and manuals don't make mention of much other than smaller combustion chamber and cam.
they really don't even offer the parts as replacements....it's all sort of ommitted.
i'll stick to building my "off road motors"

on this end the only question i ever hear is...can i build it up more....but to tell you the truth....i don't think most of my customers are turning the throttle as far as i am....cause some of these things are freakin scary
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Old 04-11-2005, 07:29 AM
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yepper, if most big dog customers knew that the 117 puts out less than 100 hp they might not buy them. truth is, even 100hp on a 700lb bike is still plenty of power for most people.
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