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cylinder head and plug
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iana
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April 6, 2020 - 9:34 am
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Hi hope all well .. I have a 66, d7  the cylinder head part no. cast in 90-1304 is s.td. I think but it will take a long reach plug ? is that normal ? 

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sunny
Norfolk
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April 6, 2020 - 10:51 am
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thers   notthing  stoping  you  fiting  a  spacer  ring    just  useing   the thread  lenth  needed  for  the  head   ,.somtime  s  long nose  or reach  plug  oil  up   much  qwiker        ,., the   older    bantam  plugs   had  a  medeum   seramick   body  lenth      you   just  mack  thins   hard  for yourself   with  the  rong  plug     

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Peterg
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April 6, 2020 - 3:15 pm
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Standard it takes a 1/2" sparkplug. A long (standard 3/4") reach spark plug is just a short reach with more threads. So, yes, it will screw in and probably miss the top of the piston.

Not recommended though

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iana
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April 7, 2020 - 7:02 pm
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Thanks very much , guys , know where I'm at now tar.  

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JackE
Buxton, Derbyshire
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April 28, 2020 - 10:57 am
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The problem with using a long reach plug in a short reach head is that carbon will build up on the threads that are inside the combusion chamber - and they may make it very difficult to remove the plug without damaging the threads after a few thousand miles of running.

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mikef
Chatham Kent
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April 28, 2020 - 12:07 pm
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Hi Ian.
         It could be that the cylinder head has been swapped at some time for a D10 head which would be able to use a long reach plug.
Unfortunately BSA used that part number on about 3 different versions of Bantam head.
I remembered this being discussed at great length a while ago. The thread is in the technical archive section of the forum. I have posted the link below.
It has pictures that may help you identify your cylinder head.
** Please log in to view **

Mike.

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