W/o any engine mods between switch?
Differences in character, power, rideability etc?
I made the switch to 41s on my '91 900ss and the difference from stock was phenomenal.
No experience on the difference between 39s and 41s, however.
Chris Kelley prefers 41's on the 900, 39's on the 750, says the ducatitech website and his store (CA-Cycleworks).
I'd like to hear more details about it. Perhaps in Tech it'll get more visibility.
I've run both on the same 968cc (900cc overbored) '95 900CR 2-valver engine (velocity stacks only w/BoomTubes) that is in my DesmoDevil now. The 41's worked well out of the box (mild tweaking) but I swapped onto another Ducati that was later sold. The 39's work ok and I get better gas mileage with them and probably about same horsepower -- but I've spent so much time rejetting/tweaking and getting them to work -- I really wish I had kept the 41's.
If I had the choice again, I'd have ordered the 41's. I bought the above 39's from Chris / CA-Cycleworks in 1999 -- there is a lot of mileage on them since then!
My recommendation: 41's and use the K&N filter option with the stock airbox. You should be able to bolt them on and go ride within an hour and not have to do any tweaking / shimming needles / etc. I guarantee you would have no regrets making that choice.
OK, thx,
guess I`ll stick w my 41`s then.
Was thinking, w a mildly tuned 900, you'll get a bit better acceleration w the smaller venturi.
And sometimes I consider this:
(http://www.jako-motorsport.de/daten/eigenprodukte/image/ansaugstutzen04.jpg)
http://www.jako-motorsport.de/ (http://www.jako-motorsport.de/) , see eigenprodukte-ansaugstutzen. [evil]