1977 Sprint 150 engine to Rally 200 engine
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Sprint 150
Joined: 26 Jul 2020
Posts: 1
Location: Virginia
Sun Jul 26, 2020 11:44 pm quote
Good day,

I am trying to figure out if I can put a Rally 200 engine into my 150 Sprint. My old engine has seized up do to someone pulling the spark plu and leaving it out, while I was over seas. I always wanted more power and speed so I figured this is the time to finally beef her up.

Thank you for your help and I look forward to your answers.
Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7799
Location: seattle/athens
Mon Jul 27, 2020 12:24 am quote
I did it in my Sprint and very happy, more torque & power plus my stockish P200 motor is so reliable too. Piece of cake to bolt the motor in, you will only have a little fiddling to get it wired for 12V. Check out TrailTech regulators, works fine for me. Show us some pics and I'll show you mine.
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 7706
Location: Victoria, Australia
Mon Jul 27, 2020 4:09 am quote
Yes it will fit, do you already own the Rally motor? They're not especially common if not. The P200 motor is really the same thing and much easier to get hold of. The other option is a cylinder kit like the BGM 177. More power than a stock 200 and you use your original motor.
Rally 200, Lambretta Li125
Joined: 12 Jun 2018
Posts: 15
Location: Austin Tx
Wed Jul 29, 2020 1:46 pm quote
Unless you already have a Rally motor and a willingness to deal with the 6V Femsa electrics, I would seek a P motor. Both will fit but parts are more easily sourced for the P.
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 7799
Location: The state of insanity, SoCal
Thu Jul 30, 2020 8:39 pm quote
depends... is it a late rally motor with P electronics or a femsa style one?

has it been recently rebuilt and runs well? hmmm

big question marks here.

are you willing to ditch the femsa stuff and upgrade to an aftermarket ignition set up?

if it needs a rebuild are you willing to upgrade to P style electrics on the flyside?

are you looking for plug and play?

what is your level of mechanical proficency?

Old Vespas and Lambrettas
Joined: 11 Feb 2019
Posts: 39
Location: Arizona
Mon Aug 03, 2020 7:41 am quote
P motor. Easier to get parts and bullet proof. My 74 Sprint has had a P200 motor in it since 2000(ish) and I love it. Now a nice solid 3 port with a BGM 177 kit sounds like a good time as well!!
63 Lambretta LI 125 series 3, 71 Sprint Veloce , 2005 Vespa PX150, 1979 P200E
Joined: 04 Jul 2011
Posts: 872
Location: Tucson, AZ
Mon Aug 03, 2020 8:25 am quote
I guess you can say I done it twice , first on a 71 sprint veloces then I swapped again (same engine) into a PX150.

My best advise to you is to think about the type of riding that you do, the reason why I am saying this is because before I did the P200E engine(malos 210) into the PX150 I was running a malos 166cc and I was bit-thing that my scooter was revving to high on the hwy and I was concerned about "blowing up" the engine(seizing it).

Fast forward and now I am on the opposite case, I swapped it to the P200E engine with a malos 210cc and now my revs are too low and the scooter has hard time passing over 65-70 mph in 4th gear.

If you do a P200E engine try the shorter 4th gear. My other advise also is to snag a nice 175-180cc aftermarket kit, they make even more power than a standard P200 engine.
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