Wed May 10, 2017 6:42 am

Lurker
2017 Primavera 50cc 4V 4T
Joined: 25 Apr 2017
Posts: 3
Location: Washington, DC
 
Lurker
2017 Primavera 50cc 4V 4T
Joined: 25 Apr 2017
Posts: 3
Location: Washington, DC
Wed May 10, 2017 6:42 am linkquote
So about 6 months ago one of my friends tells me he bought a Vespa, I have wanted a Vespa since I was a teenager (now 45) so I convinced the wife and took the plunge. I got a Primavera 50cc 4T 4V and really enjoyed it. I rode it to work almost everyday. I could to 35mph maybe 40mph going down hill w/the wind at my back, but I was still having loads of fun!

Then I started reading post here on the forum (bad idea) and got interested in seeing just how fast I could make my little 50cc go.

First I did:

Malossi 78.8cc Cylinder kit...adjusted Carb jet to 78
Malossi Power cam
Malossi Multivar Variator kit w/6.1g rollers


This was incredible the speed off the line was amazing I was at 45mph (GPS) really quickly. It was at least 3 times the acceleration! But... I would hit the Rev limiter at 45mph and still have more throttle left.

To fix that I replaced my CDI which was restricting my bike with:

Malossi Digitronic Variable Advance Digital Electronic Controller (CDI)

The bike was noticeable smoother as this CDI does more than just up the rev limiter by 1000rpm, unfortunately the 1000 extra rpms only equated to about 3 mph. I was now getting 48 MPH before I hit the rev limiter.

Back to shop... Next I installed:

Malossi Secondary Gears 15/55
Tecnigas GP4 Exhaust for Vespa 50cc 4 Stroke


This did the trick!! The Secondary gears let the engine purr right along w/o hitting the rev limter I can get 58mph (GPS) on flat no problems, and the pull up hills is great I was afraid the new gears might make the acceleration suffer but I honestly can't tell the difference.. While the exhust may have help somewhat, hard to tell, it does look and sound great.
⬆️    About 2 months elapsed between posts    ⬇️
Wed Jul 12, 2017 7:59 am

Member
Primavera 50 Settantesimo
Joined: 14 Mar 2017
Posts: 6
Location: Montreal
 
Member
Primavera 50 Settantesimo
Joined: 14 Mar 2017
Posts: 6
Location: Montreal
Wed Jul 12, 2017 7:59 am linkquote
a sound clip would be great ! I'm in the process of doing cylinder ,cam, variator and 15/55 secondary gear. do you think the cdi makes enough of a difference ?
Fri Jul 14, 2017 1:13 pm

Lurker
2017 Primavera 50cc 4V 4T
Joined: 25 Apr 2017
Posts: 3
Location: Washington, DC
 
Lurker
2017 Primavera 50cc 4V 4T
Joined: 25 Apr 2017
Posts: 3
Location: Washington, DC
Fri Jul 14, 2017 1:13 pm linkquote
I would go with your current setup, only change out the cdi if you hit the rev limiter. It is easy ScooterWest has a video on removing the glovebox so that you can acces it. Let me know how it goes, I am sure you will be pleased.
⬆️    About 2 months elapsed between posts    ⬇️
Tue Sep 19, 2017 4:37 am

Member
Primavera 50 Settantesimo
Joined: 14 Mar 2017
Posts: 6
Location: Montreal
 
Member
Primavera 50 Settantesimo
Joined: 14 Mar 2017
Posts: 6
Location: Montreal
Tue Sep 19, 2017 4:37 am linkquote
Update.
I did all of the same mods, minus the exhaust. I changed out the 6.1gram rollers to 8.1gram though. Made more sense because of the bigger displacement . Off the line is VERY minimally slower but all throughout the range it feels much better and keeps the revs lower.
Tue Sep 19, 2017 5:01 am

Lurker
2017 Primavera 50cc 4V 4T
Joined: 25 Apr 2017
Posts: 3
Location: Washington, DC
 
Lurker
2017 Primavera 50cc 4V 4T
Joined: 25 Apr 2017
Posts: 3
Location: Washington, DC
Tue Sep 19, 2017 5:01 am linkquote
the heavy rollers are keeping the acceleration down
⬆️    About 4 years elapsed between posts    ⬇️
Mon Jun 21, 2021 4:58 pm

Member
typhoon,pgo metro
Joined: 21 Sep 2020
Posts: 31
Location: montreal
 
Member
typhoon,pgo metro
Joined: 21 Sep 2020
Posts: 31
Location: montreal
Mon Jun 21, 2021 4:58 pm linkquote
Presby wrote:
the heavy rollers are keeping the acceleration down
no,not at all at 7.5 gr you are right in the power band of the 80 with the cam,also drilled two half inch hole in the air box,cut half of the s pipe,more air...and went with a 82 jet.how do i know ? the set up was made on a dyno jetting,variator,weight,air,clutch and contra spring perfectly set 8300-8700 rpm top torque,when variator fully close goes up to 9900.
and now im about to mess all that with the addition of a gp4 ...lol
must be crazy
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