Bosch spark plugs.
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Road Captain
Joined: Mar 2008
Posts: 724
Likes: 2
From: Cincinnati Ohio
Bosch spark plugs.
Anyone using these new platinum spark plugs, have 4 points that throw the spark on them? Bought em at a parts store for my truck yesterday, and think I may actually be able to tell a difference. Could be the new KN air filter too, but I think between these 2 things, I can actually feel it when I press on the gas pedal. No need to gap em. Gotta get some for the bike and see. Tried the splitfires a while ago, and wasn't impressed. They were fine and all, just didn't notice any improvement for the extra $. We'll see how these go if I can get em for the bike.
Ultimate HDF Member
Joined: Aug 2008
Posts: 5,413
Likes: 17
From: eastern oklahoma
not in any way at all would i fall for a gimmick like the newest spark plug that has several ground pins. all i use is the harley gold spark plugs, and haven't had any issues at all. you may be feeling the difference in the way your truck runs because it may have needed new plugs and an air filter. sometimes in order to justify an expense, they "feel" like it runs better. electricity follows the path of least resistance, no matter if it's got 1,2,3,or four ground legs.
Road Warrior
Joined: Sep 2005
Posts: 1,942
Likes: 7
From: guntersville, al
any new plug will likely run better than a worn plug. platinum is a poor conductor that's why they last so long with less material transfer between electrodes. copper like NGK or iron like Autolite will give best performance and cost way less.
Outstanding HDF Member
Joined: Apr 2008
Posts: 3,140
Likes: 17
From: Wisconsin
Haven't tried these, probably won't for the price. Having lived in Ohio for many years and knowing many people that have worked for Champion and AutoLite, the one thing I believe is them when they tell me plugs like this are developed for one reason, our human desire to find something better. Because of this we will believe it works better and we can "feel" the difference. Yeah, right! My neighbor worked in Fostoria at the test lab and when they tried all different plug considerations there was no improvement in combustion from any single plug head, even with the different electrode setups. The only way they obtained better combustion was to add a plug to the combustion chamber, a dual plug configuration. 
Road Captain
Joined: May 2008
Posts: 516
Likes: 1
From: New Hampster!
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
I ran Bosch platinum plugs in my BMWs and Harleys for a great many years. They ran sweeter and for longer than Champions and NGKs. Probably done a quarter of a million miles with them. Haven't come across these latest yet.
Grand HDF Member
Joined: Sep 2007
Posts: 4,112
Likes: 40
From: Boise Idaho
Buy regular old Autolight plugs, all those fancy/smancy plugs are just a new form of snake oil.
I've used Autolights in averything from an 800HP engine to my lawn mower they work first time every time.
I've used Autolights in averything from an 800HP engine to my lawn mower they work first time every time.
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Seasoned HDF Member
Joined: Dec 2007
Posts: 8,341
Likes: 714
like said earlier it will only throw one spark not 4 or 5 or whatever one spark will jump to the closest or least crapped up electode.
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Stellar HDF Member
Joined: Nov 2007
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From: New Mexico-No, you don't need a passport.
I ran bosch platinums in my one lunger for years. It would foul anything else. When you only have one, it's time to push when you foul that one. I run champions in my eg.