Are M800 and S2r800 engines the same?

[caperix]

I had always thought that the s2r800 used the same engine as the old 800 monster.  During research for an upcomming project I found that the part numbers for base gaskets, cylinders, and heads are all different.  Does anyone know if any chages were made that would prevent using newer parts on the older engine?

[Speeddog]

Did you check the old part numbers with a dealer to see if they've been superseded with a new number?

Online, you can check at ducatiomaha.com.

[scott_araujo]

Mostly the same as far as I know.  I have an '03 800 Dark (DSS). 

One notable difference is the ATPC slipper clutch that the S2R has.  I was idly wondering if I could bolt that up to my motor as an upgrade if I were so inclined, not like I have the money, time, or desire to do so.  Just curious.

There might be slight diffs and superseded part numbers but I don't think there are any major mechanical diffs like heads, pistons, cranks, etc.

Scott

[Ratfink749]

Although I don't know how it would translate into the gaskets, I can see that the M800 has the old style single plug heads and the new S2R engines are running the DualSpark heads.  I'm sure some parts will still mix and match but without having them both apart to compare/contrast, its really hard to tell what will directly interchange and what wont.

[scott_araujo]

Is that all S2R 800s or just the most recent ones?  I thought the earlier ones were single plug.

Scott

[Kopfjager]

Although I don't know how it would translate into the gaskets, I can see that the M800 has the old style single plug heads and the new S2R engines are running the DualSpark heads.  I'm sure some parts will still mix and match but without having them both apart to compare/contrast, its really hard to tell what will directly interchange and what wont.

1000 has the dual spark heads 800 is single. At least until I finish my motor. 

[Speeddog]

'07 S2R800 engine has 7mm valve stems.

All '06 and earlier 800's have 8mm stems.

[DarkStaR]

'07 S2R800 engine has 7mm valve stems.

All '06 and earlier 800's have 8mm stems.

Intresting...

Are there pros/cons to either or?

[Speeddog]

S2R1000's have 7mm stems, and have had valve guide issues.
Whether it's been bad material or bad machining, who knows.

Some S2R800's have had guide issues as well.

I've seen a higher percentage of broken half-rings on 7mm stems than 8mm.

[Raux]

i'm been learning more about this, apparently the newer bikes have the softer valve guide material that leads to more play in the valve leading to lots of problems.

[caperix]

I found the part number difference on ducati omaha's web site, the '04 800 lists a 786.1.069.2a base gasket and an '05 sr2 800 lists a 786.1.095.1a base gasket.  The larger valve stems would explain the change in cylinder head part number.
Scott on the APTC I have an assembly if you are intersted.  I went the other way on my bike as I did not like the feel of the APTC, they are a direct swap though.

[scott_araujo]

Nah, I'm cool.  I would really dig a lighter lever pressure but I like the engine braking.  It only bothers me early in the season when I haven't been riding and the muscles need to build back up.  I don't do any track really so don't need a slipper. 

I was curious though, is it slightly smaller in diameter?  I think I read that.  If so it would be slightly less rotating mass, make for a slightly more zippy engine.  Not near as much as a flywheel but something.

Thanks for letting me know they are a direct swap.

Scott