Modern Vespa

I own a 1968 Sprint with original engine. It has the 2 port openings. What would be my options for a case upgrade?

Are you referring to upgrading it to 3 larger ports to do a performance build?

Depending on what you are trying to build, there are many options.

I know about the 3 port expansion with welding on some meat a then machining that 12 o'clock port, I would rather not go through that.

I already mentioned in another post taking an engine with more ports vs displacement and I would rather the displacement but would consider anything as an upgrade.

I was also going to start another thread about what the P200 cases mouths look like.

Yes performance build.

If you put one of these on with a 60mm 110 rod reed crank and all base packer it fixes everything, all at once.
https://www.sip-scootershop.com/en/product/racing-cylinder-quattrini-m1xl-11-172-cc_15046100
All that's left to do is brace yourself.

Are you open to replacement cases? A worthwhile upgrade would be a set of used P series cases. Not only does this give you the third port, it also gives you better crankshaft options and the later oil seal type. At that point, if cost is not a big consideration, you could look at new Malossi cases. It depends what your performance requirements are. Either way, you would need a number of other components to complete your build, starting with an EFL style gearbox and better clutch.

I was going to say…The easiest way to get power out of a 2 port case is the 2 port Picasso 177 kit. Going any further, things more complicated. A P case will definitely give you more options and be easier to work with. I bought a VBB a few years back and went through the same questions. I will probably end up using an LML reed case for that bike. I might rebuild the original stock engine at some point.

For me, the 177 + big box exhaust goes faster than I have the nerve to ride. If this is your first performance build, you might want to keep it simple and cheap. Simple, because setting up a performance build can be time consuming and frustrating. Cheap, because you might find that you eventually want something different at some point.

I was also going to start another thread about what the P200 cases mouths look like.
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Here you go, stock Piaggio 200 case.

Malossi V1 case for comparison.

Say I get a p200 case what parts transfer over to it from the sprint engine?

Seems like it doesn't *need* a 110 rod. If so, I might do this with my VBB motor that's sitting with nothing wrong but an over-Dremeled exhaust port on the Pinasco 177...

I know the 60mm is the length of the rod, what's the 110?

110 is the length, 60 is the stroke.

Thoughts on an LML 3 port case with the following cylinder: https://www.sip-scootershop.com/en/product/racing-cylinder-pinasco-vespone-stx-190-cc_84151100?usrc=Cylinder

190cc looks like the biggest displacement that fits the 150cc motor.

Given the questions you're asking, you should go with the Pinasco 177. It'll be a nice upgrade without putting you too far into blow up territory.

It does need a 110 on a 2 port. Gives a 6.5mm base packer to transition the 3rd port to the cylinder. Also gets the carb further away from the frame.

Already have the 2 port Pinasco on my bike. What do you think I would need to know to put that Pinasco 190 on mine. I am willing to ride carefully.