175 CS engine? - MVAgusta.net
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post #1 of 4 (permalink) Old 01-13-2018, 05:20 PM Thread Starter
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175 CS engine?

I bumped into these engine parts for sale.

As far as I understand these are of an 175 CS (with the hairpin valve springs).

Can this engine be build up (since it's empty) with the internals of a more common Turismo 175cc engine.
I'm not familiar with these engines. Does anybody spot any problems with these engine casings? (unfortunately the seller is not the most communicative kind of guy)

I've been told the CS engine will bolt straight into the cycle parts of a regular 175 cc. Be it an overhead cam model or a later AB model. That's correct, right?

Basically I'm wondering if this would be a good start to build a CS engine, or would it be better to look out for a complete one to start with?
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post #2 of 4 (permalink) Old 01-15-2018, 03:01 AM
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Hi Sarolea,
There are a lot of common parts between the CS and CSTL engines. And yes, it certainly looks to me like a CS cylinder head.
The following link will take you to the parts list for both bikes in my Dropbox. Page 36 onwards lists the unique CS parts.


You'll see there are a lot of differences. Some will be major and some minor. I know, for example, that you can use the CSTL cylinder on a CS engine by drilling out the four cylinder bolt holes to take the larger CS bolts.

I think the key to answering your question is what other parts the seller has.

I can see there are some internal parts in the background of the photos and some look like they could be CS parts (clutch?). If he has some of the critical parts, like camshaft, valve springs etc, then yes I think you could rebuild the engine.

If however, he doesn't have the critical parts, then your task will be very difficult as the unique parts are hard to find and may even have to be made as specials.

Hope this helps. My CS engine is in bits at the moment as I'm rebuilding it. So if you want any pictures of my internals, ask now as I'm starting reassembly this week.

And finally, if you don't decide to rebuild the engine, then I may be interested in the parts as spares for mine. Where are you located?
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post #3 of 4 (permalink) Old 01-18-2018, 06:10 AM
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Just noticed a couple of problems with the castings.
1/ the hole in the centre of the RH cover(first photo, magneto side) shouldn't be there, so is probably corrosion.
2/ the hole in the RH crank case, (third photo) where the clutch actuation rod goes, looks to be badly damaged and oval, where the oil seal goes.
Both problems are repairable with welding. The RH cover may not polish up as it looks badly corroded towards the bottom (yellowish area).
And it may just be me but the valve apertures in the combustion chamber look big, so standard valves may not fit.
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post #4 of 4 (permalink) Old 01-26-2018, 10:12 PM
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Sarolea, proceed with caution. That motor looks pretty well worn out, and incomplete. That said, some parts may be saveable. But trust me, if anything critical is missing you have a long difficult search ahead. It may be worth buying for parts, but get REALLY GOOD photos or better yet, inspect in person.

My recommendation is not to try and piece something together. Find either a running bike or a complete basket case (LOL do these exist?) and know what you are buying.

Good luck!

1954 MV 175 CSS Super Sport
1957 MV 175 CS Modello Sport
1967 Motobi 125 Sport
1974 Ducati 750 GT
Left Coast USA
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