| Author | Message | ||
     Lentuk |
Do Thunderstorm heads use the smaller spark plugs that use a 5/8 socket? I have a guy wanting to sell me a sportster with what he says are Thunderstorm heads, the motor is silver and the heads are black, is there any other ways to tell if they are Thunderstorms? (Message edited by lentuk on March 27, 2009) | ||
| Jmkybf |
I believe that different spark plugs have different socket sizes. My NGK DPR7ea-9 had a 5/8" socket size and the NGK DPR9EA-9 were a bigger socket. | ||
| Zenfrogmaster |
John's right - different plugs with the same thread size can use varying sockets. Other than the color, I don't know how else to tell the difference externally. Maybe there's a casting mark? | ||
| Shupe |
Also, the threads are 12mm on my 01 Cyclone. I had to buy a new compression tester with a 12mm adapter to to a comp test. Normal is 14 or 18mm. | ||
| Preybird1 |
If it is a real thunder storm head it will have the hd number on the top of the head showing what it is, I can't tell what it is right now im at work! | ||
| Oldog |
I thought that the T-storm heads had "buell" cast in them. |
