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Mayor of Simpleton
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Discussion Starter · #1 ·
Does the S4 use the standard or drop cam heads like the S4R, etc?
 

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Mayor of Simpleton
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Discussion Starter · #3 ·
I believe motor is a standard 916. What was in the 916? With your signature, I would think you would know:laugh:
I know the S4 is a 916, but the S4R and ST4S were the 996 with drop cam heads.
 

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Wasn’t the 996 an evolution of the 916 design? Thus the desirability of the Testastretta/999 redesign with much easier access for the valve check/cams?


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
 

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Mayor of Simpleton
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Discussion Starter · #5 ·
Wasn’t the 996 an evolution of the 916 design? Thus the desirability of the Testastretta/999 redesign with much easier access for the valve check/cams?


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
Yes, unfortunately that has nothing to do with the question I asked.
 

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S4, S4R, ST4 and ST4s all share the same cambelts (shorter than the 748/916/996 belts) which implies the S4 also has the drop cam head
 

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Mayor of Simpleton
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Discussion Starter · #7 ·
S4, S4R, ST4 and ST4s all share the same cambelts (shorter than the 748/916/996 belts) which implies the S4 also has the drop cam head
Thanks. That's the only question I had.
 

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Yes, unfortunately that has nothing to do with the question I asked.


My logic: if the 996 w/drop cam heads is an evo of the 916 then the cam belts would be the same.


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
 

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Mayor of Simpleton
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4,882 Posts
Discussion Starter · #10 ·
My logic: if the 996 w/drop cam heads is an evo of the 916 then the cam belts would be the same.


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
That logic doesn't work. 916 and most 748 = "normal" heads. Late 748 and 916cc S4 = drop cam. 996 superbike = "normal" heads. 996cc (early) ST4S and S4R = drop cam.
 

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there is no logic required. if you know the models you know the answer. it was a simple question with an answer from blitzen.
 

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Good. Now I know. And knowing is half the battle.


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
 

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There is no easy answer on this forum.?
 

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Then I have a question, what constitutes a “normal” 4v Ducati superbike head? Not being a jerk. Serious question to gain knowledge of the beloved brand.

I’m doing a valve check now on my 996 in the ST4s so I visually see the cams in a lower/dropped position. Thus the less desireable side access windows.

Dan and I were just discussing the other day the difference between S4 model monsters and their engines. We realized there was never an S4R w/the Testastretta design engine. Correct?


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
 

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...

Dan and I were just discussing the other day the difference between S4 model monsters and their engines. We realized there was never an S4R w/the Testastretta design engine. Correct?


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
The one with Testastretta heads is called the S4RS
 

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Then I have a question, what constitutes a “normal” 4v Ducati superbike head? Not being a jerk. Serious question to gain knowledge of the beloved brand.

I’m doing a valve check now on my 996 in the ST4s so I visually see the cams in a lower/dropped position. Thus the less desireable side access windows.

Dan and I were just discussing the other day the difference between S4 model monsters and their engines. We realized there was never an S4R w/the Testastretta design engine. Correct?


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
 

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For Pete’s sake, sorry.

Take the “R” off of S4 and my question stands. No Testastrettas in non R model monsters.


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
 

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the "R" on the monsters (before the 1200 anyway) was not like a superbike "R". the s4 became the s4r when the 916 was replaced with the 996, and it got a single sided swingarm and flasher paint scheme. but it was an otherwise std 996 st4s engine and s4 suspension pretty much.

the s4rs was introduced in 2006 with the 999 engine and ohlins all around. in 2008 that bike was also available with showa suspension and was again called the s4r. i would refer to it as the s4rt to distinguish it from the earlier desmoquattro engined s4r.
 

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Dan and I were just discussing the other day the difference between S4 model monsters and their engines. We realized there was never an S4R w/the Testastretta design engine. Correct?


2004 Ducati ST4s ABS “Senna”
2002 Yamaha FZ1
There was a S4R with the 998 Testastretta engine. It was made at the same two years as the S4RS. The difference was that the S4R had Showa suspension instead of Ohlins that the S4RS had.

Another difference were the wheels. S4RS had the light weight forged Marchesinis and the S4R just the heavier aluminum wheels.

Everything else was the same.
 
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