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  #1  
Unread 11-10-2011, 07:06 AM
Jools Jools is offline
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Default Unleaded heads

Just after a bit of info.

With the V twins my understanding is they (3YL & 4DP) were all leaded fuel, std dome type alloy combustion chambers until the 4TW model copper insert top hat types that came out in 96 for unleaded fuel?

Is there any issues with running the later copper type with avgas ?

Jools
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  #2  
Unread 11-10-2011, 10:50 AM
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check cc and squish
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  #3  
Unread 03-29-2013, 09:40 PM
Billyboy Billyboy is offline
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I iv'e run the copper ones with no problem.
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  #4  
Unread 03-30-2013, 07:24 AM
Bud Bud is offline
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What they said.

You should have about 8.8cc head volume and 0.7-0.8mm squish.
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  #5  
Unread 03-30-2013, 08:21 AM
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All things being equal, the copper should be more det resistant (or at least the damage from.....)
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  #6  
Unread 04-01-2013, 03:41 PM
170plus 170plus is offline
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8.8cc is a little head. It's hard to get a lttle head.
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  #7  
Unread 04-01-2013, 05:20 PM
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legal here now though (paying for it that is).....
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Last edited by Twinshock750 : 04-01-2013 at 05:25 PM.
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  #8  
Unread 04-02-2013, 07:19 AM
Bud Bud is offline
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Boom tish
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  #9  
Unread 04-02-2013, 09:23 AM
Jools Jools is offline
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didn't Garry Glitter get into trouble for that...............
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  #10  
Unread 04-02-2013, 02:32 PM
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Garry's head was inelligible by being too new a model
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