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Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
I read on the Triumph Register Forum that some were using NGKBP6ES plugs(normally for 250's and TR6's) on their 3's and 4's. I checked with NGK and they say that those plugs have a 3/4" reach and could hit the piston! They recommended NGKBP6HS which has the required 1/2" reach for the TR3. Either the 3/4" still clears the piston or they've got their numbers wrong?
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TR2/3/3A More on Spark Plugs for TR3
- Thread starter karls59tr
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... all around! Likely they won't hit the piston (and I know they don't in 1147cc Spitfire engines, either), but they <span style="font-style: italic"><span style="font-weight: bold">are</span></span> just that much more difficult to remove if they've been in a very long time!