I guess the next big questions are, is this normal? OK? Optimal? What would be optimal?
With regards to head temperatures here's so much discussion on the subject on various motorcycle forums and so much miss-information out there. Especially from forum 'gurus'. I like to get information from as reliable sources as possible.
I found this great diagram about air-cooled aluminium engines and the relationship with temperature and strength from the book by Pratt and Whitney called 'The Aircraft Engine and its Operation'. I actually found it in a post from a guy on a motorised bike forum: http://motoredbikes.com/threads/maximum-safe-cylinder-head-temperature-cht.40994/
I trust a diagram like this. Pratt and Whitney engineers would have known their stuff.
This means that with the SR's head temps getting to 214C on the highway in 26C heat its in the safe zone, but what would the head temp be on a hotter day? In warmer climates than Sweden's pathetic summers? Maybe the carb would just need to be jetted richer... Attached is another cool diagram showing the relationship between rich/lean conditions, temperature, power and economy.
With regards to head temperatures here's so much discussion on the subject on various motorcycle forums and so much miss-information out there. Especially from forum 'gurus'. I like to get information from as reliable sources as possible.
I found this great diagram about air-cooled aluminium engines and the relationship with temperature and strength from the book by Pratt and Whitney called 'The Aircraft Engine and its Operation'. I actually found it in a post from a guy on a motorised bike forum: http://motoredbikes.com/threads/maximum-safe-cylinder-head-temperature-cht.40994/
I trust a diagram like this. Pratt and Whitney engineers would have known their stuff.
This means that with the SR's head temps getting to 214C on the highway in 26C heat its in the safe zone, but what would the head temp be on a hotter day? In warmer climates than Sweden's pathetic summers? Maybe the carb would just need to be jetted richer... Attached is another cool diagram showing the relationship between rich/lean conditions, temperature, power and economy.