NGK ping....
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Intermediate
Joined: Apr 2014
Posts: 44
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From: Iowa
NGK ping....
Read bunch of stuff on these can't seem to find the right answer, been running Ngk DCPR7EIX in the bike came in it for last 20,xxx decided to change them and now she pings after 5,ooo rpm never did before,has a Thundermax auto on it, Chris Waddell dyno tuned her last yr at Strugis WOW!! definitely worth the monies!!! anyway gaped them .40 thou...any idea's?? going to play with gap a little
Tks Randy
Tks Randy
Road Warrior
Joined: Apr 2010
Posts: 1,648
Likes: 37
From: Monroe, Louisiana
Read bunch of stuff on these can't seem to find the right answer, been running Ngk DCPR7EIX in the bike came in it for last 20,xxx decided to change them and now she pings after 5,ooo rpm never did before,has a Thundermax auto on it, Chris Waddell dyno tuned her last yr at Strugis WOW!! definitely worth the monies!!! anyway gaped them .40 thou...any idea's?? going to play with gap a little
Tks Randy
Tks Randy
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Intermediate
Joined: Apr 2014
Posts: 44
Likes: 1
From: Iowa
Ngk DCPR7EIX is one step hotter than stock plugs. If you are going to run NGK which I like The 8 is suppose to be same as stock and 9 one step cooler. Gap them on .035" also. Make sure not to get any anti seize on the tip as it will cause lots of trouble. If too much on the seating area can cause problems too. Really just need it on threads. Little dab will do you. Haven't tried them but the Harley VRod plugs are 2 steps cooler than the Twin Cam plugs. Colder plug isn't going to hurt you as a too hot will. It may be little harder to start or not idle as smoothly, but not likely. Low fuel pressure can cause this also.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,464
Likes: 50
From: Rouses Point, N.Y.
Ngk DCPR7EIX is one step hotter than stock plugs. If you are going to run NGK which I like The 8 is suppose to be same as stock and 9 one step cooler. Gap them on .035" also. Make sure not to get any anti seize on the tip as it will cause lots of trouble. If too much on the seating area can cause problems too. Really just need it on threads. Little dab will do you. Haven't tried them but the Harley VRod plugs are 2 steps cooler than the Twin Cam plugs. Colder plug isn't going to hurt you as a too hot will. It may be little harder to start or not idle as smoothly, but not likely. Low fuel pressure can cause this also.
Road Warrior
Joined: Apr 2010
Posts: 1,648
Likes: 37
From: Monroe, Louisiana
It really depends on which chart you look at to compare the temp ranges. They do vary. It is likely your 8 is one step colder. I don't understand how he ran for 20000 miles with 7 and no ping then new ones ping. Something going on with that. If he still has the old plugs put them back in and see if it pings. Pinging after 5000 rpms makes me think more in the line of low fuel pressure. Strange things happen some times.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,464
Likes: 50
From: Rouses Point, N.Y.
It really depends on which chart you look at to compare the temp ranges. They do vary. It is likely your 8 is one step colder. I don't understand how he ran for 20000 miles with 7 and no ping then new ones ping. Something going on with that. If he still has the old plugs put them back in and see if it pings. Pinging after 5000 rpms makes me think more in the line of low fuel pressure. Strange things happen some times.
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