burnin up plugs
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Joined: May 2025
Posts: 76
Likes: 9
From: South Carolina
burnin up plugs
Hey group need some insight. i just put in new NGK BPR5EIX-11 iridium plutgs a week ago. Yesterday the bike wouldnt run. I pulled the plugs and the front was foul and the badk was caked. I have never seen plugs do that in a week. the ones i took out looked ok just no idea how old they were. Wire brush, some WD 40 and a gap tool i got it running just like new. i will pull them after cool down every time to see whats going on. There have been no carb adjustments. I did pull the filter and did a recharge on it. There was alot of what looked like oil on the backing plate. Open to the thoughts of the group.
Thx
JJ
Thx
JJ
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,116
Likes: 7,639
From: Poolville
Get rid of the iridium plugs and put in the BPR5ES-11 copper core plugs..
Then ride it for 100 miles and then post pics of the plugs.
and don't forget to route the breathers to atmosphere, you don't want them going back into the motor..
Then ride it for 100 miles and then post pics of the plugs.
and don't forget to route the breathers to atmosphere, you don't want them going back into the motor..
Last edited by 98hotrodfatboy; Aug 19, 2025 at 07:49 PM.
Seasoned HDF Member
Joined: Nov 2006
Posts: 21,082
Likes: 19,240
From: The Wasteland
A lot of people have trouble with those Iridium plugs. I have always had good luck with OEM.
By the way, did you do a lot of highway miles? Some bikes will breathe a lot of mist into the air filter when running highway speeds for a while. Try lowering the oil level in the motor to about 3/4 full on the dipstick. That helps keep the oily mist from blowing back into your motor.
By the way, did you do a lot of highway miles? Some bikes will breathe a lot of mist into the air filter when running highway speeds for a while. Try lowering the oil level in the motor to about 3/4 full on the dipstick. That helps keep the oily mist from blowing back into your motor.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,604
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From: Cental, MI
I guess I care Less about "what Carb" than "Who Tuned it" But...If Oil..I'm betting oil tank is Over-full...like @ Bubba Zanetti says..
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Joined: Jul 2025
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From: UK
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Stellar HDF Member
Joined: Jan 2015
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From: ct
Sounds like you're running your oil level at the full mark or slightly over I always keep mine a half quart low and never a problem with over misting.
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I think your motor is completely done, cooked, burned up. Save yourself the heartache and by a new bike. I will take that one off your hands for free, no charge! Go ahead and sign over the title, I will be over shortly to pick it up and get that head ache out of your garage 
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Joined: Jul 2025
Posts: 71
Likes: 66
From: UK
I think your motor is completely done, cooked, burned up. Save yourself the heartache and by a new bike. I will take that one off your hands for free, no charge! Go ahead and sign over the title, I will be over shortly to pick it up and get that head ache out of your garage
