450 desmo carb

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Beach Life
Posts: 9
Joined: Sun Jun 28, 2020 3:22 pm
Location: New Zealand

450 desmo carb

Postby Beach Life » Tue Jun 30, 2020 1:08 am

I'm considering a 32phf carb for my 450 desmo as an upgrade from the VHB29 that is on it. It will have an 87mm piston, standard valves and a fairly straight through conti style megaphone. Any thoughts, advice? And jet sizes, or where to start?
Cheers.

Duccout
Posts: 261
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: 450 desmo carb

Postby Duccout » Tue Jun 30, 2020 5:33 am

The 32mm is the right size carb for road use. There is some info on here about it, and a good starting point would be the settings from a Ducati 860 GT, GTS, or Darmah, although be wary of the Darmah settings as they had anti-pollution carbs.

Beach Life
Posts: 9
Joined: Sun Jun 28, 2020 3:22 pm
Location: New Zealand

Re: 450 desmo carb

Postby Beach Life » Tue Jun 30, 2020 11:02 am

Thanks Duccout, If I have trouble getting a clamp type, would the ones with the rubber manifold sit alright on a modified inlet manifold?

Duccout
Posts: 261
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: 450 desmo carb

Postby Duccout » Tue Jun 30, 2020 11:44 am

Some people on this site have used a flexible fitting, but the big problem is clearance, because if the carb is moved away from the head by very much then the frame gets in the way. It is possible to fit the rubber sleeve over the original Ducati manifold, but as this is only 29mm bore it defeats the exercise a bit, but there are lots of possibilities if you don't mind a lot of fiddling. Try Road and Race in Australia.

The easiest way to fit a 32mm carb is to use an Amal, which bolts straight onto the head, and was a common fitment here back in the day.

graeme
Posts: 705
Joined: Sun Mar 25, 2012 12:00 am
Location: Tasmania Australia

Re: 450 desmo carb

Postby graeme » Tue Jun 30, 2020 9:08 pm

I have two 450’s with 32 phf
Darmah jets and slides but change the atomiser to 262 instead of the standard 265.
Both are standard valves, and are 87mm bore.
The Scrambler has a clamp type carb, but you will have to try and get an air cleaner to fit due the the 450 frame gusset.
The RT has a rubber hose connection which doesn’t give as smooth a flow internally. You have to play around with an extra hose clamp to get the rubber coupling to sit properly.
There is no issue with the RT frame interference fitting an air cleaner

Graeme

Beach Life
Posts: 9
Joined: Sun Jun 28, 2020 3:22 pm
Location: New Zealand

Re: 450 desmo carb

Postby Beach Life » Thu Jul 02, 2020 7:29 pm

Thanks Graeme


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