The request was posted 3.5 years ago, a lot has happened since then.
I installed the Siebenrock-kit, ported the tops and installed a 296° camshaft and have used this setup for about 30kkm.
The result was stunning! Low rev torque has increased a lot and at 3500 rpm it is increased by 75% which was exactly what I was looking for.
I have not (yet) had any problems with low octane petrol but so far I have used mostly high octane.
This bike will not be equipped with double-plugging; if I get problems I will solve it in another way.
The gearing is original (for R80GS) except that the bike is fitted with an 18” wheel.
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