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Hi Richard,
It seems that Klaus Tuning sells the additional cooling fin. He also sells a special 103 cylinder which is longer (about 5 mm over the 'normal' 103 mm cylinder) at the top. That meens it probably has the necessary length when the extra fin is welded on to the head. Klaus only sells engines with a maximum stroke of 78,4 mm, mind you (according to his catalog anyway). Maybe those cylinders are specially made for him, ...I don't no. His catalog is interesting reading BTW.
I hope to have shed some additional info on the subject, but maybe you knew this already...I personally have no experience with it though..
Are you contemplating such a mod for your engine than?
Greetings,
Walter
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