ducatipaso.org

Gents,
I have trolled through these pages and found the suggestion of the Aprilia thermostat swap. So I bought one, and I'm having a hard time getting it to fit gracefully. There just isn't enough room above the thermostat for the connection and elbow. So, i did a bit of searching.

Seems that there are a few other candidate thermostats:
- 1098 /1198 / 748 / SR4/ST3 Seems to have straight outlet on top, and larger diameter than the Aprilia
- The Aprilia of course. Smaller top hose though, which needs to be dealt with.
- Husqvarna 310 (don't know what the tubing sizes are)
- KTM 950/990 Adventure. Looks to be the same as the 1098 one.

Anyone tried any of these other ones?
I have a 1098 one coming in the mail this week, so I'll let you know if that works. Seems the hose fitting for the water pump sits higher on the thermostat, which will lower the top outlet so I can more gracefully get the connection to to the stock pipe on top. A 1/2 copper plumbing joining sleeve is the correct size to fit inside the rubber hose under the tank for a joiner.

The other thing I noticed, was that the 907/906/851 water pump housing has its outlet facing straight up, while all of the later Ducatis have the outlet facing forward. This too will help lower the thermostat and give more room for a graceful connection under the tank. Has anyone tried fitting any other water pump cover to the 907/906? The mounting pattern to the engine looks the same, at least from pictures I find on e-bay. However, they do call out 4 and 5 bolt fitting.

Lastly, I did the cbr600 radiator cap and filler, and that worked wonderfully. Makes you wonder why they didn't do it originally.

Cheers,

Phil

Thanks for sharing the info Phil, I've probably got all this stuff looming in the future on my 907's. Arch

OK, so a bit of an update (partial)

Here is the stock thermostat (the right one) next to the Aprilia 1000 thermostat



and here is the space on the bike where the thermostat goes.



Since I could not find a graceful way of modifying it, I kept the stock one in. It works fine, and the coolant that came out of the bike was crystal green. I have fired it up and confirmed the stock thermostat works as it should.

I'll update with pictures of the 1098 thermostat, and the Aprilia Mana 850 thermostat. Nothing is plug an play, but I'm not giving up on finding an elegant solution.

All of these thermostats are made by BEHR in Italy. Anyone have a factory contact name that might be able to replace the thermostat in the old housing and re-crimp the band? My old BMW 1600/2002 car had a similar thermostat.

Cheers, Phil

I think the right size of Marman clamp and any similar sized thermostat will fix our aging Paso with the old housing.
Just cut off the old clamp install the Marman and thermistat and forgetaboutit



an update 2 inch marmon will cost about 25usd or more
there are now shrink to fit clamps in a 2 inch size for about 5 bucks from McMaster Carr
I plan to check it out and see how it works and how durable it may be


http://www.mcmaster.com/#standard-hose-clamps/=vb2q4p

I like that idea.
I searched Marman Clamps, and lo and behold, it was invented by one of the Marx brothers. Harpo. (edit- Zeppo )
Anyway, looks to be an alternative. When mine dies, I'll take it apart and sort that out.
The Aprilia ones are cheap enough on e-bay, and modifying them with a Marman clamp will make it last well past my life time.

Cheers,
Phil

I don`t know if the hoses sizes are the same but did you see the one of the Hyosung GT 650 ?
Its problem of course is that hose nipple in the middle but seeing that the thermostat housing can be disassembled one could heat up the housing and pull the tube out (or cut it off) and if the housing was thick enough, tap the hole and insert a short screw with some thread sealant.
(That thread that can be seen inside the housing on the last picture is for a temperatur sensor)

G.

Actually it was Zeppo Marx (Herbert)

just got a reply from a seller of a Hyosung thermostat on ebay. The larger hose connection is 26,6mm outer diameter (21mm inner) and the two others are 19mm (14mm inner).