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Old 12-11-2012, 10:47 PM   #9
pommie john
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Joined: Apr 2008
Location: Brisvegas, Australia
Oddometer: 1,410
Hey Tosh, look what I found

"Beyond the YICS feature, the 750's cylinder head is conventional, with two valves per cylinder and dohc driven from the crank by a roller chain. The valve sizes are the same as on the Maxim 650, 33mm intake and 28mm exhaust. But valve timing is different, to match the larger displacement, the 750's intake valves opening 38" BTDC and closing 58 ' ABDC for a duration of 276; the 750's exhaust valves opening 56 BBDC and closing 36 ATDC, for a duration of 272. The 650's intake valves are timed at 34-58 for 272 duration and the 650's exhaust valves are timed 66-26, again for 272 duration."

That works out at 100 degree lobe centres for both inlet and exhaust.

It came from here if you want to check ..

http://www.motorcyclespecs.co.za/mod..._sega%2081.htm
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pommie john screwed with this post 12-11-2012 at 10:48 PM Reason: spelling
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