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Discussion Starter · #1 ·
There are differences in figures quoted in various Ducati S4R litrature regarding bore/stroke, gear ratios and sprockets.

Bore & Stroke
The S4R spec says a bore of 96mm and a stroke of 68.8mm wereas the manual says 94X66.

Sprockets
The spec says a front/rear sprocket combination of 15/35 whereas the Ducati sales guide for MY04 states 15/42 (significantly the Ducati

Performance catalog list only a 42T rear sprocket for the S4R) tho this publication also describes the engine as being 2 valve air cooled!!.

Gear Ratios.
According to the owners manuals the S4 & S4R have the same transmission ratios (in difference to what has been staed here that the S4R has a

'close ratio' box). However the aforementioned sales gude, has a different set of ratios that are wider than those quoted in the owners manuals

for both the S4 & S4R.

Now just what are the correct specs.
 

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Discussion Starter · #3 ·
>By the way, what does Chupa stand for? You know how words in one language mean something entirely different in another?<

Actualy Chupa is Tagalog slang means door blower.
 

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In Spanish, chupa is just the opposite. It's 'sucker' as in chupacabra (goat sucker).

I guess depending on the context and company, it could mean the same thing. ;)

--Fillmore
 
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