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  #1 (permalink)  
Old 07-15-2004, 07:55 PM
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Bike Year, Make, Engine: 1996 softail w/ 89" s&s
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i keep fouling plugs & need some help

i keep fouling plugs & need some help
i am running an 89" s&s motor
w/ a compu-fire ing.
my plugs are black & smell like gas (they are wet if i pull them after running it)
i've been told they are "fuel fouled" and need to run a hotter plug.
i am currently using autolite 66 now
i've used harley plugs ...the same thing
what is a "hotter plug"
what is everyone else running?

thanks in advance

here's a pic.
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Old 07-15-2004, 08:51 PM
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You'd likely get more responses in the Shop Talk area....

But, the hotter plug is on that generally sticks out further into the chamber. Manufacturers will have a range of 'heats' for a plug style.

If your bike runs really good, then hotter plug should do you. You could also be running rich. Have the air/fuel ratio measured to be sure.

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Old 07-15-2004, 09:55 PM
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My previous scoot was a '94 Heritage with a 89" stroker motor. I had a very similar problem that turned out to be a faulty voltage regulator. Plugs weren't getting the juice to fire every time.
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Old 07-16-2004, 06:59 AM
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Gary, on the plug issue. I suspect you need your carb dialed in a bit, you didn't mention carb type. Also With my S&S I have always used the enrichener for initial start only, then I lock the throttle at a slightly higher rpm for warm up.
A hotter plug simply transfers less heat to head, a cooler one transfers more to head. You will notice a difference in the amount of ceramic around the center electrode when comparing the two (length).
Another reply mentioned getting full spark, I agree, make sure that's happening.
Gettting a "puff" out exhaust when you nail it is a sign of a misadjusted accellerator pump, (S&S E, or others w/pump). Keep in mind stock S&S's are not known for being a "snap" type carb, more of a "roll on", (I hear DaVincy modifies to remedy that, but have no first hand experience, pricey too).
Sorry for the long winded reply everyone,(left out main jet swap), I'm new here...love this stuff.

Last edited by skid; 07-16-2004 at 07:25 AM..
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  #5 (permalink)  
Old 07-16-2004, 07:15 AM
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more than likely you need smaller jets , has it always ran like that ? if not did you change your pipes, did you get bigger jets and no pipes and still have a factory air cleaner ? you need to tell us more and you'll get more help hope you respone so we can help more
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Old 07-16-2004, 07:38 PM
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ok here's a little more info.
-no changes its has been like this for the nearly 5 years i've been riding it. sometimes i can go 4 months without changing them...but sometimes 4 days.
-i'm running a s&s E carb
-i've never pull the enricher no need
-i also eat up batteries in this bike about one a year i've used expensive battieries they aren't much better so now i just buy the cheap one at wal-mart & when it dies i take it back (under warrenty)
thanks for the help guys i'm new to this forum & just tryin to learn as much as i can
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Old 07-16-2004, 09:29 PM
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Have you checked your timing? wuthout out that none of your other adjustments will be correct. sounds like you might have a needle/seat sealing and or a float adjustment problem. which would lead to erratic flooding.
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Old 07-16-2004, 09:39 PM
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Also, as others have said more info is needed such as compression ratio, displacement, cam, rpm range ,etc.
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Old 07-16-2004, 09:43 PM
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sorry, 89 S&S, got that! Afew too many budheimers tonight!
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Old 07-17-2004, 09:17 AM
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use 2ga welding cable for your batt leads...grind off all chrome, paint & powdercoat at every connection
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Old 07-17-2004, 10:47 AM
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cals right...the foulin & batt are two separate probs...i just fought the batt & won, it was a simple fix too...i'm all ears on the foulin, even tho mine doesnt foul
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Old 07-17-2004, 07:56 PM
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thanks guys. i think i'll take it to a pro & have them go through the carb. i'll keep ya posted.
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Old 07-18-2004, 04:44 PM
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might want to think about compression releases also..that could save the battery and the starter in the long run
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Old 07-18-2004, 04:58 PM
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on the compression releases... i have dual plug heads but i'm only runnin 2 plugs. can i get a set that will thread into the other sides plug holes?
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