TZ350 and 250 Discussion Forum

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-   -   Unleaded heads (

Jools 11-10-2011 07:06 AM

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 ?


hyside 11-10-2011 10:50 AM

check cc and squish

Billyboy 03-29-2013 09:40 PM

I iv'e run the copper ones with no problem.

Bud 03-30-2013 07:24 AM

What they said.

You should have about 8.8cc head volume and 0.7-0.8mm squish.

Twinshock750 03-30-2013 08:21 AM

All things being equal, the copper should be more det resistant (or at least the damage from.....)

170plus 04-01-2013 03:41 PM

8.8cc is a little head. It's hard to get a lttle head.

Twinshock750 04-01-2013 05:20 PM

legal here now though (paying for it that is).....laughing

Bud 04-02-2013 07:19 AM

Boom tish laughing

Jools 04-02-2013 09:23 AM

didn't Garry Glitter get into trouble for that...............

170plus 04-02-2013 02:32 PM

Garry's head was inelligible by being too new a model

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