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Discussion Starter #1 (Edited)
Hello all,

Just wanted to pick your brains on this bike that has come my way... and I'm pretty sure it'll create the disagreements I have seen on here regarding this model in question.

Please cast your eye over the photos I attach and be brutally frank, as I will probably have to sell this bike and don't want any wool pulling over any potential purchaser's eyes.

I am under the impression it is a 175 CS Sport... (is that the Dischetta?). It is a UK registered bike, imported from Italy about 8 years ago. Was originally supplied with a Disco Volante tank which turned out to be a little spurious, but now has what is believed to be the correct tank for the model. I know the rear shocks are the wrong colour, and ignore the battery wiring, as this is just a lash up to get it running.

The UK log book states date of first registration as 01/12/1955 (that's 1st December 1955 for any US readers...).

What bothers me is the engine number which is 47**** but followed by lower case SS, which would suggest the Disco Volante engine from '54... (am I correct?).
Frame numer is 40**** stamped on headstock, though I have not found to what model this number relates.

It was used twice on the Motogiro D'Italia, in 2005 and 2006.

Any thoughts or input, and don't pull the punches! Any more info required, please ask.

Over to you....
 

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Discussion Starter #2 (Edited)
Though I have read that a '55 engine should have a single S suffix... this is also assuming nobody has had the sledgehammer and stamps out to make it something it isn't.....

Anyway, as I am new to these particular bikes, I am sure you will impart your wisdom upon me....
 

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well im no expert at all but thats very nice
shame u may have to sell it
 

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I believe that you can contact the curator at the Barber Museum in Birmingham Alabama with a request for information and assistance. They have considerable knowledge and an expansive library related to MV Augata products.....not to mention a pristine correct example of just about every MV made, including some original factory team racing models.....

And they are nice people...


And that's a nice bike. Would love to have something like that in my garage one day.
 

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Discussion Starter #5
Thanks for your reply and the infor regarding the Barber Museum.. I have just emailed them, so hopefully will have some response. What a fantastic looking place! If I am ever over that way, I know have reason to visit Alabama.

As for having to sell it, we'll see... it may not be the case but I can't have everything....

Roger
 

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You need to contact the MV Agusta owners Club of Great Britain, they have the only set of the factory dating records and without doubt the most knowledgeobout bikes of this vintage.
Join the MVOCGB and also benefit from the vintage spares scheme.
jimboF4
 

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Hi Roger
Very good looking Sport. Very little jumps out as unusual: carb, muffler tip, exhaust collar, horn. Why did you find the Disco tank suspicious? If you can PM me a clear photo of the motor number I can tell you a lot more, also the third and fourth digit of the numbers.

What size is the carb? Overall length of saddle? Are there any numbers stamped on the bottom of the motor?
Best regards
Ivan
 

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Discussion Starter #8
Thanks Ivan. I will supply the photos and details later once I am back from work.

Those items you list, carb, exhaust etc. do you mean those aren't standard?

As for the tank, it was fiberglass and didn't seem to fit the frame mounting properly... had a pair of 2 inch brackets from the lugs on the tank to the mounting point on the frame, so it seemed a little suspect to me....

I know there are so many being passed off as something they aren't that my first opinion was one of cynicism... I am English after all!

And Jimbo, thanks for the advice. I will look into that one.
 

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Thanks Ivan. I will supply the photos and details later once I am back from work.

Those items you list, carb, exhaust etc. do you mean those aren't standard?

As for the tank, it was fiberglass and didn't seem to fit the frame mounting properly... had a pair of 2 inch brackets from the lugs on the tank to the mounting point on the frame, so it seemed a little suspect to me....

I know there are so many being passed off as something they aren't that my first opinion was one of cynicism... I am English after all!

And Jimbo, thanks for the advice. I will look into that one.
Sometimes it pays to be cynical. Your new tank is great, these bikes were well styled when new and did not require a Disco tank to be handsome.

When new the horn was mounted up under the gas tank, centered on the frame spine. Usually they are the fat-bodied style typical of 50's Italian 6 volt horns.

The exhaust nut at the head should be ribbed around it's circumference.

The original muffler body is more curved than angled, and the tip has a different outlet fin profile.

The original carburetor was a Del'lorto tipo MB22B.

Here is a 1956 brochure for reference. The 1955 and 195 Modello Sports were virtually identical, except for handlebars.

Thanks!
Ivan
 

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Discussion Starter #10
Thanks Ivan. I will email you the photos of the numbers, and if you let me know what background you can find, I'll be most appreciative.

The silencer on the bike is an Emmeri (?) which I have seen on a few Italian bikes of the era, so I assume that was a common aftermarket part.

As for the horn, I have noticed them mounted under the tank like you said. I actually have one i could use on a Ducati Elite project bike I will be putting some time into over winter, so may steal it from that in the meantime.

I'm not too concerned about overall originality to be honest.

I have noticed the gearbox is a little stiff at times... was this a characteristic or should I take a look at it?

Oh, and here is a photo of the suspicious tank... apologies for a slightly dark photo
 

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Discussion Starter #12
In answer to your carb question, the one on it is an MC26F

I do have a NOS UBF22B in the garage, but this has a manual choke lever on the body of the carb, rather than a cable and lever on the bar.
 

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In answer to your carb question, the one on it is an MC26F...I do have a NOS UBF22B in the garage, but this has a manual choke lever on the body of the carb, rather than a cable and lever on the bar.
Hi Roger!

"Emmeve" is the phonetic spelling for MV, and commonly stamped on MV mufflers. But the muffler on your bike is from possibly a CST or CSTL. If it fits well, you can leave it, it should function OK.

The MC26F is an interesting choice (original to 1940's Bianchi and Moto Guzzi 500cc motors). How does your motor like it? From experience a UB24 carb will fit easily and is very good for general riding around. The Dellorto UB choke is rarely needed, the float bowl tickler is normally enough for starting.

Your UB22 would be OK too, but it won't fit, unless your Sports intake stub has been modified for a flange mounted vs spigot mounted carb.

Looking forward to more info,
Ivan
 

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Discussion Starter #14
I should have known that one, given that I speak Italian and lived there for a couple of years! The script makes it look like an 'r' and not a 'v'... thanks for clearing that up. It seems to run fine with that on, though the end fishtail is removable, so I might whip it off, depending on the increase in dB and see if it helps it a bit more.

Runs fine with the carb as is, and completed 2 Motogiri d'Italia with it, so all good.

I have sent those photos to your yahoo mail address
 

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Roger,
Just sent you a response by email. Thanks for the extra info.

I forgot to mention the gearbox shifter parts can be (partly) accessed thru the right side motor cover. It may be you can find something hanging up there in the lever mechanism? Frequent oil changes with good oil may help a little. Unfortunately these gearboxes are fragile and often in abused condition. Proper shimming at reassembly is important. We once made a small run of new second gear cogs since those are often badly worn and chipped. Of course gear box work requires splitting the cases.
 
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