I have a love for all two wheels this one stood out for me . what engine from bultaco is it based on anyone knows  please or a one off ?

Thats a bultaco TSS

 

Worth loads of money they are. All the Bultaco engines are essentially the same carcass, just different states of tune and gears to suit their application. The outward appearance changed in early seventies when they went from the round barrel and rounded cases to the square barrel and slimmer cases as fitted on your 175

It's not a TSS, it's a Montjuic 360 based 24 hour racer. Hence the lights and big tank. 

Yes it is a Montjuïc race bike.  The engine is a 4 speed 350cc    This engine was used in the bandito and el montadero models.  As well the M29 TSS used it. The preproduction Montjuïc road bike that never came to be used this power plant in its early development stage.  Note the center port exhaust exclusive to this engine type.  I believe the factory called this the “pedrables” engine.   Whereas the 5 speed models were called San Antonio.  

There were only 2-3 of this montjuic built by the factory for 24 hours racing.  It was likely loosely built around the 350 TSS but didn’t carry the M29 designation.  Highly regarded and exceedingly rare 

Steve 

The Montjuic did share the El Bandido engine for reliability the TSS only shared engine cases and was in a much higher state of tune with a 5 speed box.

I'm lucky enough to own and race a TSS 

 

Very nice !! One of only 57 made !!! (Or 58 depending who you talk to) I’ve seen serial #33 and one other one but can’t remember it’s serial.  I actually wasn’t aware the M29 had a 5 speed box but it does make sense they would use it.  

Steve 

On 28/08/2018 at 9:12 PM, woody said:

All the Bultaco engines are essentially the same carcass, just different states of tune and gears to suit their application.

The El Bandido/Montadero & TSS engines are actually stand alone in that they have gear driven primary not chain and have a central exhaust port rather than off to the right as all other Bultacos 

Edited August 31, 20187 yr by watch this

I could never understand why Bultaco didn't use/develop that engine more in their motocrossers, especially the big-bores, but I'm told it is a very heavy engine and that Pomeroy hated it. Apparently that meant end of story at the factory at the time, whereas the Brits (Malcolm Davis & Vic Allen) loved the last 400 prototype based on that engine.

Seemed to me to be a much better design than the chain-drive engine.

Anyone know the truth?

I don't think the engine was any heavier maybe the bike as a whole.  On the dirt bikes they would regularly crack gearwheels and shear crankshafts for the mkII's they did redesign the cush drive but it only slightly reduced the breakage issues, it is very rarely an issue with the road bikes so I assume it must be the constant knocks and chopping of gears on a dirt bike.

I thought the engine died when Bultaco gave up on road racing and didn't realise the 400 was based on it, everyday is a school day!

I only know all this because one of the few interchangeable parts between the TSS & El Bandido/Montadero is the clutch basket and I've been after one in good shape for years so I can build up a spare clutch, parts for these engines a few and far between now. 

Edited September 1, 20187 yr by watch this

I don’t think the 400 prototype motor was the same as the el mont or the bandito. it was a right side forward kick that directly engaged the crankshaft.  It certainly was a gear drive primary though. I do have several close up pictures of the prototype engine.  Even the Center cases look different.  Having said that some of the peripheral parts were common to other models.  Incidentally the 400 prototype engine number is M100.  Not to be confused with the 125 pursang that also has this designation.  I’m told most prototypes always began with M100

 

steve 

Edited September 1, 20187 yr by stevem75

Here are a few pics of the 400 prototype engine.  

4 hours ago, stevem75 said:

 

Here are a few pics of the 400 prototype engine.

 

Compact unit innit? Shame it never progressed.

 

Looking closer at the Montjuic its interesting to note what a parts bin special it is, the frame looks very close to a TSS with additional bracing on the head stock and swing arm, the front and rear mudguards look like plastic items from a trials bike, air filter from a Metralla maybe? and very interesting to see they choose to leave the kickstart and clutch inspection cover (the TSS cases have neither its bump start only and no air filter), and most strangely the reversed gear-lever why no linkage like the TSS? The hole in the frame is there for it.

Edited September 1, 20187 yr by watch this

Watch this, which year and which sprint are you in on the picture ?  I remember seeing a picture in the local paper of a TSS being loaded in Granville I think it was, a couple of years ago, to Jersey.  Then the trail went cold !  As I had a 1960’s TSS I was hoping to see it.  Regards, John Parry.

19 minutes ago, johnjsy said:

Watch this, which year and which sprint are you in on the picture ?  I remember seeing a picture in the local paper of a TSS being loaded in Granville I think it was, a couple of years ago, to Jersey.  Then the trail went cold !  As I had a 1960’s TSS I was hoping to see it.  Regards, John Parry.

Hi John, yep same bike sprint was only last year, I've been over to the mainland with it for a few race meets good fun little bike eh? I'm currently out of action with a hand injury so all my toys are tucked away, will hopefully have it out next year. Double entry for the hillclimbs for old times sake?

Edited September 1, 20187 yr by watch this