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@shepys avatar
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Vespa T5 classic 1994 and 1980 Vespa p200e
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@shepys avatar
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Do engine casing have to be matching ?. I went to buy a Vespa P200E engine and I noticed the engine wasn't match where the cylinder goes. The top part is out by a 1/4 of inch. I pointed it out to the guy and he said it is fine it was out of a running scooter it wouldn't be a problem. I told him I will get back to him about it. Was he trying to be ripped off.
@mjrally avatar
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Don't buy it! The halves need to match. They are machined as a pair. It'll work till it doesn't and then they're garbage. Just dealt with this on a locals scoot.
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2007 Stella 225
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UTC quote
shepys wrote:
Do engine casing have to be matching ?. I went to buy a Vespa P200E engine and I noticed the engine wasn't match where the cylinder goes. The top part is out by a 1/4 of inch. I pointed it out to the guy and he said it is fine it was out of a running scooter it wouldn't be a problem. I told him I will get back to him about it. Was he trying to be ripped off.
Do you have a picture? Did both case halves have same number stamped on them?
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what do you mean by "out by a 1/4 of inch"?

Matching is normally identified by a 3 digit number stamped in the cylinder gasket surface or at the back of the case near the oil drain. the same number should be on both sides.

If the machined surface where the cylinder sits was different from one case to the other that would be bad, but even on unmatched cases they are never off by 1/4"

If you mean that the un-machined edge of one case is 1/4" different from the edge of the other on, that is not a big deal and not uncommon around the rotary valve.
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I realised after my last trip back to the UK, that unmatched cases is the norm.

Everyone seems to be riding/trading unmatched cases.

I brought a few unmatched cases and they seem to line up. But I haven't built any engines up yet. So still don't know if they work.
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I've see enough perfectly fine running bikes here with unmatched engine case numbers to make me think it's not much of an issue. I guess it devalues the bike somewhat.
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Vespa T5 classic 1994 and 1980 Vespa p200e
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When I said unmatched by 1/4 I'm guessing. It could be abit smaller. I can't remember what numbers what was on the top where the cylinder sits. Another guy I know said the engine was out of his friends scooter and it is ok he he it for years. I always fort engines have to be match so it's all new to me I don't know much about it.
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I forgot to mention, between the 3 mismatched cases I have, I tried swapping them around and they're not interchangeable.

I suppose the most important things is the mismatched cases "line up".

On initial inspection, the ones I have the driveshaft seems to fit ok, but not sure the rest. Only time will tell.
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This link has some insights.

[url] P200 VSE1M engine cases non-matching halves

Haha!

"Piaggio also did not advocate 'matched cases only' until after the mid 1950's. even though engine cases were stamped with the serial part of the vin on both sides, they would happily sell you a spare side if you had a damaged one."
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If the deck isn't flat the air leak at the cylinder base will haunt your jetting…
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Shepys - there are two different conversations going on here I think.
1. "matched case numbers". The cases have numbers stamped in them. Its on the opposite side of the cases from where the cylinder goes.
2. You are referring to the base formed when two halves come together - to allow the cylinder to sit on it? Your description could perhaps be clarified. What exactly did you see? Were the cases bolted together when you saw it?
Etc.

Your seller could shoot you a couple pics.
Perhaps ask him to shoot a pic showing the case numbers - so you know if they are or are not a factory match.

Guys here want to help - but need a bit more clarity to give you good feedback.
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Could the perceived issue be what's in this picture here?

If so, so long as the case numbers match, then probably not an issue. Every set of p200 cases I've worked on has the same offset at the top of the mouth there.

¯\_(ツ)_/¯
Forum member supplied image with no explanatory text
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JimVanMorrissey wrote:
Could the perceived issue be what's in this picture here?

If so, so long as the case numbers match, then probably not an issue. Every set of p200 cases I've worked on has the same offset at the top of the mouth there.

¯\_(ツ)_/¯
^^^ this is what i was thinking Shepy was asking about
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Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
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Vietnamese matched cases
Forum member supplied image with no explanatory text
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I have almost 1k on unmatched P200 cases.
I don't advocate it, but I also don't ascribe to the idea they are bound to explode if not matched. Pretty rudimentary design and fairly robust in their simplicity, and really the tolerances aren't thatttttt tight. YMMV
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JimVanMorrissey wrote:
Could the perceived issue be what's in this picture here?

If so, so long as the case numbers match, then probably not an issue. Every set of p200 cases I've worked on has the same offset at the top of the mouth there.

¯\_(ツ)_/¯
I have seen that offset in a number of my number matched cases. That kind of thing doesn't matter.

My preference would always be to buy a matched set. I wouldn't bother with a mismatched set for a small block case, but would be willing to do more work on 200 cases if the price was right. I would have to check them first. I would bet any differences could be set right with basic matching techniques.
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@shepys avatar
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Vespa T5 classic 1994 and 1980 Vespa p200e
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The engine has been sold now guys. Thank you for the feedback
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shepys wrote:
The engine has been sold now guys. Thank you for the feedback
If you were having doubts, i think you might right choice walking away. Something else will turn up. If the friend had it in his scoot for ages and it was OK, why on earth was he selling it in the first place?
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@shepys avatar
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UTC quote
A friend know the guy who was selling it. When I went to have a look I ask why is he selling it and he said he got a pinasco casing. That's when I saw it wasn't matching and I said it's not a match engine. He said it's ok it's not a problem. I said I will get back to him because I had a funny feeling about it. So I put it on here to find out if he was right. I didn't bother to go back to check if the numbers match or ask for photos after the feed back I got. Feel abit silly for wasting your guys time. I had doubts straight away. As far as know engine should be matching but I don't know that much about it.
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