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Old 5 Aug 2011
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Fuel tap thread question: PD06 Transalp/ RD04 Africa Twin

Hi guys

Hope someone can help. Without going into the whole story, I’m looking to replace my 1987 Pd06 Transalp fuel tap from the oem one with the stupid (IMHO) vacuum hose attachment (that magically turns the fuel off when it wants to… not when I want to, and hence my bike stops when I don’t want it to…) to one that has no vacuum feed from the cylinder head, just gravity.

FWIW, I believe the RD04 Africa Twin fuel tap has the same thread, although it only has on/off, but no reserve.

I have a Transalp oem fuel tap in front of me. My veneer caliper tells me the thread is 12mm. Great, I think to myself… But after a very brief search on Google, it appears there are 1mm, 1.25mm and 1.5mm (and possibly more) pitch 12mm threads on after market fuel taps. My veneer caliper doesn’t fit in the “nut” hole of the fuel tap to measure the pitch.

However I don’t have the bike handy. (It’s in Estonia (I’m in England) and I’m flying there in 7 days to do a trip to North Cape in Norway). So I can’t measure the pitch of the thread on the tank that the tap screws onto.

Can anyone help with the thread size/pitch I need to buy?

I really appreciate a quick reply. Many thanks in advance.

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Old 6 Aug 2011
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Hi Chris.
Most Hondas use M12 - 1.0mm thread for the fuel tap, i'd be quite confident the AT is so. I'd also guess that a tap off an XL600LM (PD04) would suit your AT.
Just going for a short ride on my bike....
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Old 6 Aug 2011
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Hi Jon
Thanks for the reply. Having been taught how to use my veneer calipers correctly (see the xrv post above) I believe the thread on the TA tank is between 17 and 19mm and 1mm pitch. Either way, I've modifed a spare TA fuel tap I have here so it has the stupid vacuum thing is disabled and works like a normal gravity petcock. I will swap them in Estonia.

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