350 scrambler

[veloduke]

Just to help in your search for a Road 77 motor, frame numbers for this model start MD42--- but engine numbers start MD402---

That's interesting, Jon. I was looking at a '77 Road for sale some time ago, and I would have sworn that had an engine no. beginning MD42xxx (and frame no. MD42---).
I see chassis no for the -76 Road were MD40xxx, so presumably they carried on with engine no. sequence.
A Road 77 would have 12V electrics, I think.

[veloduke]

Ok I'll have a look

Thanks Dave, looks like I need to think about engines beginning MD 40xxx, too!

[Jon Pegler]

For some reason the Road 77 was numbered with MD 42--- for the frame number s and MD 402--- for the engine number.
The 250 Strada followed on after the Road 77 in 1978 with a similar numbering system but beginning MD 43--- for the frame and 403--- for the engine numbers.
I'm not sure why this was done as engine numbers starting 42--- and 43--- were not used for any other Mototrans model.
The Road model was always a bit chaotic, with both narrowcase and widecase variants and many parts from the Scrambler.

Road 77 models were all 12 volt with the same alternator rotor as the Strada and Vento models.
This used a different puller to most other flywheel pullers, requiring a puller with a male thread 33 x 1 mm in size.

Just another part of the fun of owning a Mototrans Ducati.

Jon

[veloduke]

Thanks Jon
That clears things up, MD40xxx it is then.
Hopefully Dave L can come up with something - this one is a narrowcase version.

This is an endless voyage of discovery

[Rocla]

Hello Dave,

I've also a Spanish Scrambler 350 1974. I guess yours is more recent. Which year ? Here some pictures of the mine one : https://strv.pagesperso-orange.fr/strvm ... alerie.htm

[Dave L]

Hi Rocla, my scrambler is 77-78.At least I think it is! The documents I got from traffico in Palma Said this but they also said it was a BMW so who knows!
Centre stand is available, see pic. He did say that a stand from a forza would also fit and I have compared one I have with the scrambler one they are very similar, the forza one being about an inch longer.
250 engine with 40... available in narrow case. It's a 24 hours model though.see pic

[Jon Pegler]

Forza centre stands may be a similar length but they do not work on a Scrambler frame.
The stops on a Forza stand to prevent it swinging too far are in the wrong position when on a Scrambler frame.
The photo that you show is the stand needed on a Scrambler.

Engine number MD 40157 is from a narrowcase Road model, not a 24 H.
It is probably from about 1975 or 1976.
Electrically it would have been 6 volt originally, although easily converted to 12 volt.
It would work fine in Veloduke's Road 77.

24 Horas engine numbers start 97... or 98... ( And not 96... as some sources believe )

Jon

[Dave L]

The case has 24h stamped on the opposite side to the engine number. Maybe that case comes from a 24 house engine!

[Jon Pegler]

I would guess that someone has stamped that 24H onto that case.
On genuine 24H cases the LH case is either unstamped or the numbers are facing the same way as the numbers on the RH case, not the opposite way around as has been stamped on that case.
There have been many fake 24H imitations produced in Spain due to the high price of genuine ones.
The engine number is certainly from a narrowcase Road, 5-speed.
Note the R stamped the same way as the engine number. Road.

Jon

[Dave L]

It could also be that the top end and piston are 24 hour spec. I’ll ask the boss and see what he says. He is a retired Ducati mechanic and will have, no doubt an explanation