Fantasy Ducati Thumper

[Dirty Duc]

Which tooling are you talking about?

Also....

60HP out of a production 500 is ambitious.
KTM can get 50 out of a production 500.

KTM also has to play in the big-boy class, this fantasy gets more HC+NoX and the same 12 points of CO.  Although KTMs are water-cooled.  Nobody said anything about naturally aspirated...

I'm talking the patterns with which to make the molds for say: cylinders, cylinder heads, cases, etc.

[Düb Lüv]

i may be mistaken, but i think i saw this for sale on ebay not too long ago.

[Raux]

Half a 1198 makes a 599 thumper, 4v watercooled...
Would you keep front for low center of gravity or rear and shorten frame/lengthen swingarm?

[Speeddog]

I'd keep the vertical cylinder.

Dunno why they kept the horizontal on the Supermono, makes no sense to me.

[ducatiz]

I'd keep the vertical cylinder.

Dunno why they kept the horizontal on the Supermono, makes no sense to me.

It's a balance shaft.  Plus it let's them use the same crank and case.

[Speeddog]

It's a balance shaft.  Plus it let's them use the same crank and case.

Same parts will work either way.
set up like they did it on the Supermono, or with the balance rocker on the horizontal and active cylinder on the vertical.

[Curmudgeon]

If I had a "rich aunt", I'd take a Borile. 

[Dirty Duc]

I think for the supermono it made sense to keep the weight down low.

For a scrambler...   I'd put the horizontal head on the vertical cylinder move the plant up and forward in a shallow sump case. 

I would use small end located piston, and just run balance on the flywheel... Harmonic damper or whatever.

[Raux]

That 599 848 conversion uses a super lightweight balanced crank and a spacer where the second rod goes. Seems the simplest way.

[Dirty Duc]

Yeah, but the 848/1198 cases have the dangly ball-sack sump.  It just looks like it wants to meet a babyhead rock square on the drain plug.

Shallow sump looks better in my head, especially after adding skid plate.

[Raux]

999 shallow sump would work for a 500 thumper.

[Speeddog]

Small motor cases (800 and smaller wet-clutch) are about 1/2" shallower than the big case.

Dunno compared to the deep-sump, IMO those are a lost cause for off-road use.

Depends whether this fantasy thumper is a street unit or a dual-purpose ride.

[Raux]

True. Sooo 400 thumper scrambler... 600 thumper supersport

[Speeddog]

OK, 2 models then.

I'd prefer Enduro and SuperSport.

Scrambler has already been sullied by various foo-foo motos.

[Raux]

how about an old 620 mts with a thumper and big front rim