Sportcity 250ie -->350ie swap
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Enthusiast
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 80
Location: Zagreb/Croatia/EU
Tue Nov 08, 2016 2:45 am quote
Hi Modernvespa pals,

Sorry for not perfect english- I still learning;-)
Im Balki from capital of Croatia/EU- Zagreb. Two years ago I bought my 1st "bigger" scooter Sportcity 250ie with 24kkm after my few 50/70ccm "rockets". In same time I started to follow Modernvespa and get idea for some "upgrades".
I made bigger valves in original head and piston machining, tuned airbox, rised fuel pressure to 3.5 Bar, put Polini Hi Speed... but nothing happens. ECU simply doesn't alow any significant performance improvement.
Then idea was born about engine swap and research started...
Since Beverly 350ie share the same 250/300ie engine without any chasis or body adaptation I found that "project" can start. I found used 350ie engine with wheel and support arm. Wheel still had original tire what means that runs about 10~max15 kkm;-)
On ebay I found starter, airbox, manfold, exhaust, lambda, harness... and ECU without keys.
Guy from local forum mojskuter.com programmed me key transponder like "master key" and gave me needed antenna.
Original SC harness have 26 pins connector so I cut 350ie harness, found 26 pin male connector from faulty Bev500 ECU and made interconnection cable 26->34 pin.
From 350ie injector i removed original "rail" pipe (wo flow) and put rail pipe from original 250ie injector with flow- on this way I didnt had to make fuel pump modification.
With antenny and precisely placed transponder new ECU "recognized" key what I seen by added blue LED with 2kOhm resistor...
I successfully put original SC engine supporter to engine with small effort but found that whole engine and wheel stays 17mm "offset" on side. Small cut and weldings + few washers solved this problem and now all stays perfectly alligned. I must say that previously I "filled" support silent blocks with "SIKA Tack Drive" car glass seal and they are now much more stiff. Bottom end of shock absorbers also asked for modification but side cutter and welding machine was my friend again;-)
Finally I get what I want- fun, quick and agile scooter for city and local roads what not shame from longer seaside trips;-)
After few weeks of testing I found that gear was filled with gear oil but I replaced it with Eni i-ride 15-50 based on manufacturer SVC bulletin since they found that "wet clutch" doesn't like high density gear oils.
Here are some photos what can help if someone want to make the same on his Vespa or other scooter with Quasar engine;-)


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Last edited by balki on Tue Nov 08, 2016 5:29 am; edited 2 times in total
Addicted
GTS 300 Super ABS/ASR
Joined: 07 Jun 2014
Posts: 960
Location: Washington DC
Tue Nov 08, 2016 4:14 am quote
Fantastic project!
Enthusiast
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 80
Location: Zagreb/Croatia/EU
Tue Nov 08, 2016 5:46 am quote
Thank you;-)
I added two more photos. During making all this I didn't even wash or clean installed parts more then necessery what tells that I put focus on function and not appearence in this phase. Since scooter is 2007 and black plastic covers are totally shaded my next step would be paiting of them (normally before I have plan to invest in new tires- probably Pirelli Diablo).
Probaly two component black Hempel yacht paint with added "non slip" deck coating compaund. Previosly all would be degreased and would be used theiy plastic primer. I hope I will get stabile rough black surface resistant to UV and hard wear. (If this is good for boat deck surface I hope it would good for scooter plastic covers and rain guard).
If/when I finish this I will post this above in the same place...
Molto Verboso
Vespa GTS 250ie
Joined: 02 Jun 2015
Posts: 1142
Location: San Francisco Bay Area
Tue Nov 08, 2016 1:39 pm quote
Big job!
Enthusiast
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 80
Location: Zagreb/Croatia/EU
Thu May 09, 2019 12:27 am quote
Wheels are still rollin'



Enthusiast
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 80
Location: Zagreb/Croatia/EU
Thu May 09, 2019 12:38 am quote
Meanwhile front fork get Racetech Gold Valve emulators. Ordered new linear main springs and meanwhile I'm using original...







Lurker
BV350 Euro 3 '12
Joined: 11 Jul 2018
Posts: 1
Location: Barcelona, Catalunya
Wed May 29, 2019 2:59 am quote
Re: Sportcity 250ie -->350ie swap
balki wrote:
After few weeks of testing I found that gear was filled with gear oil but I replaced it with Eni i-ride 15-50 based on manufacturer SVC bulletin since they found that "wet clutch" doesn't like high density gear oils.
Hello Balki,

It's the second time I read this, but I couldn't find any aditional info. Do you have the SVC bulletin were that is said?

Thanks!
Enthusiast
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 80
Location: Zagreb/Croatia/EU
Thu Jul 04, 2019 11:17 pm quote
I don't have any written confirmation about this. Just get the same info from two friends and one still working like main engineer in Piaggio svc center in Zagreb/Croatia. Based on my knowledge and experience this was enough for me to follow their recommendation. Like you could see here I still rollin'

Before two days just changed engine oil. Didn't found in local shop Eni so next choice was Motul 15W50 Technosynthese (ester). In gear is still Eni i-Ride Scooter 15W50 because no needs to change it so frequently.

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