Modern Vespa

Rikko,
Just catching up on the insanity.
To fix the hole, it may be smarter to use a patch piece of aluminum.

Because the area is thin, this will likely improve the outcome vs trying to build up filler material, and require less heat.
Have him then tilt it on its side and put water in that area to check for any leaks.

Bolt cases together. Preheat. Wrap in welding blanket for longer cooling, etc.

I tried to follow the issue you had with pattern, was it that the actual cylinder studs didn't match the pattern they sent?

That's an interesting take, that may work actually. I want him to "fill" from the fly side, so that I don't have to dig again. I don't know if he'll agree to preheat and blanket, but I'll ask on Monday. I guess I can wrap it in blanket myself, after he finishes welding.

Re. the pattern, template VMC provided perfectly matched the stud pattern a.k.a. the cylinder. But I found that the pattern itself is not exactly P2 like. Stud bores are smaller, by 0.4mm and one of the studs doesn't match the P2 patterns available here on NSM. It's off slightly, which could cause mounting issues, but maybe not. Didn't go that route to find out.
In addition, when exhaust is bolted, cylinder assumes a position which didn't match any known reference. So went back to basics, and determined the location by lining up the crank, rod, piston and cylinder. Then marked the template and ground it down. Unfortunately, I was so excited to be moving along, that I forgot to pay attention to wall thickness. So I punched a window in the side of the block, and here we are.

Recommend you check that MRP manifold for air-tight. I've had two now that leaked from new. Could even see through the holes in the weld area in one of them. Ended up fillet welding them myself over the top.

I'd say the window on the side of the block is mandatory if you're shaping the ports right, based on the Malossi design. I'd assume you're going to have to return to the dremel once the window is closed anyway to get the shape right again. The shape of those slides is more important than the allure of skipping a step..

Yeah, I get the sentiment. It does look botched. Firstly, I can see how it could have failed at the weld seam, secondly the flange is bent from welding process.😂
Thanks for the heads up. I didn't mean literally to leave it, I'll give it a lick. 😁 But I'm happy to give it less, if it can be helped.

Yes I see Autosol is available here. I'll take your recommendation in the unlikely situation I ever decide to polish something!

As per my post in Shock me! topic, shocks have been ordered.

In the meantime, I went to purchase a piece of alu coupon. To repair the window in the side of the crankcase, I needed roughly 3cm², so looked a 100cm² (same that I had for the SaFis reinforcement plate). None were available, so I had to buy 1000cm².

But think of all the things you can make with it..

Make and sell some reinforcement plates

Fuel pump mouting brackets to hang off the engine.

Combined fuel pump and coil bracket to suit vape and assorted manufacturer


The list goes on 😀

🤔 making some extra brackets... Good call. 👍🏻

Don't see myself making anything for sale though. Too much squeeze for not enough juice.😁

Depends on how much free time you have i guess.... and you underestimate how much people are willing to pay for "specialist and unique".

Line your own swimming pool 😉 or at least pay for the cleaning chemicals

So now there is a large capacity cylinder for the PX1 engine. Or I didn't understand the video?

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Smallframe scooters from what I xan make out

That's for the smallframe. However they have had the 251 for largeframe out for a few years now. It's loosely based on the T5 apparently, "loosely" in this case means that almost every part is proprietary - so Pinasco!
Given the known outputs for the Q244 and VMC244 at about 30hp, the 251 bolt-on sits at about 24 if memory serves. So, really expensive and underwhelming.
Jurgen does say it's his favourite motor though. But then he's absolutely gone to town on it to get it to perform. What he says he likes most is how smooth it is compared to PX. Think the crank is wider than PX and much heavier. Plus a very symmetrical cylinder layout, much more motorcycle looking than anything Vespa.
If somebody would produce a decent cylinder for it, it would probably be a good thing.

Maybe I misunderstood when he said 260 for the large frame. 🤔
I thought this was supposed to be a new product they just raced.

Anyhow, not like I'm gonna change anything my project right now, I think I got everything that I need in terms of parts. The only variable is time to complete it. 😁

Must admit I didn't actually watch it! But I think they also more recently produced a large cylinder to fit the 200 case as well, a la Quattrini etc. I'd like to imagine due to poor sales of the 251, but maybe that's just me questioning Pinasco's tactics.

If success was measured in Italian fanboys posting big gifs of "100%" on every information-free post Pinasco puts up on FB, then they would be doi9ng very well indeed.

Yeah...if you're going for absolute maximum smallie power, the Quattrini M200S is still the end-all-be-all for anything other than totally custom dyno builds. All you have to do is not screw it up and you're sitting about 44 HP.

I rode my friend's M200 (non-S) track bike a few weeks ago and while my smallie beats it for in-band power, the M200's power band is insanely wide.

Good stuff (and loud AF) either way.