Newbie question....
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Ossessionato
2015 Sprint 150 ABS Yellow. 1974 Vespa Rally 200 White, non battery model.
Joined: 06 Feb 2006
Posts: 2304
Location: Austin, Tx
Sat Feb 14, 2009 8:49 am quote
Alright you bunch of vintage experts...

We just got in a pair of 78 and 79 Vespas in for service.
These were bought new by the current owners.
They have been sitting around for a little while and well, they need some serious TLC.
One is a 79 PX125 (685 original miles!) and the other a 78 50 Special small frame (282 original miles!).
If the motor cannot be reworked, will a bigger motor fit in that small space???

Thanks in advance.
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2006 PX 150 & Malossi Kitted Malaguti Yesterday (Wife's)
Joined: 11 Dec 2007
Posts: 12959
Location: Paros Island, Greece
Sat Feb 14, 2009 9:16 am quote
Re: Newbie question....
AlexBv200 wrote:
Alright you bunch of vintage experts...

We just got in a pair of 78 and 79 Vespas in for service.
These were bought new by the current owners.
They have been sitting around for a little while and well, they need some serious TLC.
One is a 79 PX125 (685 original miles!) and the other a 78 50 Special small frame (282 original miles!).
If the motor cannot be reworked, will a bigger motor fit in that small space???

Thanks in advance.
Are you referring to the P series or the small frame? They are not the same. And, what do you mean by "bigger" motor, and what would require such? A p200 would fit in the 125. Larger displacement small frame engines could be put into the 50cc.

Or are you talking about a unit other than Vespa?

Al
Ossessionato
2015 Sprint 150 ABS Yellow. 1974 Vespa Rally 200 White, non battery model.
Joined: 06 Feb 2006
Posts: 2304
Location: Austin, Tx
Sat Feb 14, 2009 1:40 pm quote
Re: Newbie question....
Aviator47 wrote:
AlexBv200 wrote:
Alright you bunch of vintage experts...

We just got in a pair of 78 and 79 Vespas in for service.
These were bought new by the current owners.
They have been sitting around for a little while and well, they need some serious TLC.
One is a 79 PX125 (685 original miles!) and the other a 78 50 Special small frame (282 original miles!).
If the motor cannot be reworked, will a bigger motor fit in that small space???

Thanks in advance.
Are you referring to the P series or the small frame? They are not the same. And, what do you mean by "bigger" motor, and what would require such? A p200 would fit in the 125. Larger displacement small frame engines could be put into the 50cc.

Or are you talking about a unit other than Vespa?

Al
Sorry; I was refering to the 50 Special which is a small frame, or narrow body (Is it the same thing?)
If we cannot rebuild the 50cc engine, can a 125 or 150cc engine fit?
Moderator
2006 PX 150 & Malossi Kitted Malaguti Yesterday (Wife's)
Joined: 11 Dec 2007
Posts: 12959
Location: Paros Island, Greece
Sun Feb 15, 2009 2:56 am quote
Alex-

This thread will give you the conventional wisdom here.
http://www.modernvespa.com/forum/topic40873?highlight=frame

If you compare the two scoots visually, I think you will see the magnitude of the task.

Unless the smallie engine is profoundly damaged, you should be able to rebuild it and increase the displacement enough to get impressive performance. It doesn't have to remain at 50cc!

Good luck, and keep us posted.

Al
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 7258
Location: The state of insanity, SoCal
Sun Feb 15, 2009 3:22 am quote
Re: Newbie question....
AlexBv200 wrote:
78 50 Special small frame (282 original miles!).
If the motor cannot be reworked, will a bigger motor fit in that small space???
Quote:
...Sorry; I was refering to the 50 Special which is a small frame, or narrow body (Is it the same thing?)
If we cannot rebuild the 50cc engine, can a 125 or 150cc engine fit?
if you've got a '78 50 special then you're in a good place.
replace the primary, add a top end kit (dr, polini, malossi) throw a noise maker pipe at it, upgrade the carb to a 19 and be done.

if you're looking for a budget rebuild, go with a primmy 125 stock top end and a ET3 bananna pipe and the 19 carb-- just be sure to change the primary out from 50 to at the least a 90, or a 125. otherwise, it'll just be slow and disapointing.

best,
-greasy
Molto Verboso
many
Joined: 10 Jan 2007
Posts: 1042
Location: NY
Sun Feb 15, 2009 5:39 am quote
Quote:
Unless the smallie engine is profoundly damaged, you should be able to rebuild it
+1



Rob
Ossessionato
2015 Sprint 150 ABS Yellow. 1974 Vespa Rally 200 White, non battery model.
Joined: 06 Feb 2006
Posts: 2304
Location: Austin, Tx
Sun Feb 15, 2009 8:14 am quote
Thanks guys.
The owner of that bike is in her mid 60s... we will see what she wants to do. She absolutely adores her Special.
We will start taking the bike appart on Tuesday or Wednesday, so I'll keep you guys posted.
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