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2007 Stella 225
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I was looking on SIP and selected 1980 V5B3T, several cylinders showed up all the way into 130cc range.
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Don't quote me, but I think all small frame engine cases are the same after like late 60s, when they introduced the 125 top end to the small frame lines. To make the case compatible with all size top ends offered in the frame size. So any of those cylinder kits for small frame. I believe I read it in one of my vespa all model books recently cause I'm looking at a 71 v90 to compliment my 78 v100 and wanted to double check that same idea.

But maybe someone who definitely knows for sure will chime in.
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swiss1939 wrote:
Don't quote me, but I think all small frame engine cases are the same after like late 60s, when they introduced the 125 top end to the small frame lines. To make the case compatible with all size top ends offered in the frame size. So any of those cylinder kits for small frame. I believe I read it in one of my vespa all model books recently cause I'm looking at a 71 v90 to compliment my 78 v100 and wanted to double check that same idea.

But maybe someone who definitely knows for sure will chime in.
Poking around it looks like up to low 100cc no mention of crankshaft, 130cc mentions 51mm crankshaft stroke.
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Probably anything fits, if the cases have the bigger "spigot" diameter of the later ones. I can measure a set of V50 cases I have, that definitely accept a 130cc cylinder and let you know. 43mm stroke will work for up to 102+ kit, for a 130+ kit you'll definitely need a 51mm stroke crank. This is what I've done on our "Special" build...
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SaFiS wrote:
Probably anything fits, if the cases have the bigger "spigot" diameter of the later ones. I can measure a set of V50 cases I have, that definitely accept a 130cc cylinder and let you know. 43mm stroke will work for up to 102+ kit, for a 130+ kit you'll definitely need a 51mm stroke crank. This is what I've done on our "Special" build...
From what I have read 1980 is newer version with larger spigot hole.
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Here is where I was reading it.. from the Jasper Foehn FB content that I reposted on MV:
Smallframe Chassis Identification
Quote:
Unificata came in the fall of 1965 with the debut of the VMA1 "Nuova" and the Super Sprints. Unificata means unified. They called it that because they transitioned the Vespa 50/50S/90 to the new base with the large engine door and thus unified production, all small frames now being built on the same platform. They had to do this because they had transitioned to a larger engine case for the 125 and they only wanted to manufacture one engine case moving forward just as they only wanted to manufacture one chassis moving forward. The larger engine case requires the unificata chassis. With the unificata molds, the pronounced curve at the forward end of the bottom of the cowl is gone. Because it is still short wheelbase the floor and the sides still reach the same distance back.
Unificata being the unified small frame body they introduced in 65 to pair down all the small frame variants into one body style and engine case style for simplicity of manufacturing.
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I'd suggest you get the longer crank. I ran a Polini 100+ kit of some kind on the stock 50Special crank and didn't like at all. No real power until you are winding the piss out of it, please gimme 125cc or more for some torque! Especially if you are running a stock 50 Special 3 speed.
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Opening is 62mm
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V oodoo wrote:
I'd suggest you get the longer crank. I ran a Polini 100+ kit of some kind on the stock 50Special crank and didn't like at all. No real power until you are winding the piss out of it, please gimme 125cc or more for some torque! Especially if you are running a stock 50 Special 3 speed.
Agree. Then deal with the gearing. You really have to do:cylinder, crankshaft, and gearing.
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We'll see what happens, didn't sell at $450.00 last time, issue is if people know fee structure, $600.00 bid is $800.00 with fees for an unknown scooter. I'm not willing to go any higher on bidding only interest is because its a small frame, and I don't see many local to me. It's missing motor door so that's another expense.
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2007 Stella 225
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UTC quote
V oodoo wrote:
I'd suggest you get the longer crank. I ran a Polini 100+ kit of some kind on the stock 50Special crank and didn't like at all. No real power until you are winding the piss out of it, please gimme 125cc or more for some torque! Especially if you are running a stock 50 Special 3 speed.
From reading I've done should be a 4 speed that year.
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64 V90 survivor '65 Allstate survivor. '75 V90 SOLD. '77 P200 SOLD
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If they are at all like the V90, the 63 to 65 had 56mm small spigot cases. A 14mm wrist pin with a bushing and 3 speed that is extremely difficult to change to 4 speed.
66 and later had 61mm spigots, 15mm wrist pin with needle bearings and an easy upgrade tp 4 speed.
I looked but could not find specs for the 50.
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