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UTC

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2007 Vespa 250 GTS
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Location: Nashville, Tn
 
Hooked
2007 Vespa 250 GTS
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Posts: 439
Location: Nashville, Tn
UTC quote
There is a 2011 300 motor on ebay, bid is $700. Sounds tempting but will it be compatible with my 07 GTS 250? This auction will end soon so I am asking for future reference. Mine has 38000 miles andit is using oil, I have to refill every 500 miles
TIA
Tony
⚠️ Last edited by tonymarchman on UTC; edited 2 times
@rob_g avatar
UTC

Hooked
2008 GTS250, 2009 S150, 2017 GTS300Super, 2006 GT200
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Hooked
@rob_g avatar
2008 GTS250, 2009 S150, 2017 GTS300Super, 2006 GT200
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Posts: 348
Location: Houston
UTC quote
Read this thread…
Fit GTS250 engine into GTS300SS - what needs to be done?

You're trying to do the opposite but all the points and concerns should make sense
@jimc avatar
UTC

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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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Location: Pleasant Hill, CA
 
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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Posts: 43658
Location: Pleasant Hill, CA
UTC quote
Easier and far cheaper to replace the rings. Even if you get the Malossi 275cc kit it's still under $400.
OP
UTC

Hooked
2007 Vespa 250 GTS
Joined: UTC
Posts: 439
Location: Nashville, Tn
 
Hooked
2007 Vespa 250 GTS
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Posts: 439
Location: Nashville, Tn
UTC quote
Do I need to replace the ecu if I did the malossi upgrade
@jimc avatar
UTC

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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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Location: Pleasant Hill, CA
 
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43658
Location: Pleasant Hill, CA
UTC quote
tonymarchman wrote:
Do I need to replace the ecu if I did the malossi upgrade
I gather you don't need to, but here's a link to one that would allow some tuning:
https://www.scooterwest.com/force-master-2-ecu-fuel-controller-250ie-malossi.html
UTC

Hooked
2013 BV350, 2014 GTS , 2016 GTS, 2013 Downtown 300i, 2018 Like 150i
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Location: Dahlonega, GA
 
Hooked
2013 BV350, 2014 GTS , 2016 GTS, 2013 Downtown 300i, 2018 Like 150i
Joined: UTC
Posts: 418
Location: Dahlonega, GA
UTC quote
jimc wrote:
Easier and far cheaper to replace the rings. Even if you get the Malossi 275cc kit it's still under $400.
Tony,
If you go this path, I'd go with new engine studs, Orings, and be aware that once you get in there and see wear,
you may want to replace a rocker or cam shaft. Also, it might be a good time to send your head off to scooterwest for a check/rebuild. You would end up with a fresh top end for another 30k miles.
@boraxman avatar
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GTS250
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Location: So. Cal.
 
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@boraxman avatar
GTS250
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UTC quote
Im in the middle of this - 300 engine into a 250 GTS. Im taking it slow time permitting. My only concern is the 250 ECU on the 300 but I did see a thread somewhere saying that ECU's are closed loop and should work? Only a small difference in cc's...Guess Im goin to find out...
@lottolearn avatar
UTC

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2019 Liberty 150
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Location: NEPA
 
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@lottolearn avatar
2019 Liberty 150
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Posts: 280
Location: NEPA
UTC quote
boraxman wrote:
Im in the middle of this - 300 engine into a 250 GTS. Im taking it slow time permitting. My only concern is the 250 ECU on the 300 but I did see a thread somewhere saying that ECU's are closed loop and should work? Only a small difference in cc's...Guess Im goin to find out...
The closed loop is it's using the O2 sensor to trim the fuel mixture and will use short term (additive and instant) and long term (multiplicative and takes longer) adaptives to correct the fuel mixture. If the short term reached there limit, either rich or lean, the long term will adjust until the O2 sensor can trim the mixture. You might have to put some miles on it before it fully corrects as long as the system is capable.

Think of it this way. The short term is constantly correcting say between 5 and 10 (sweeping back and forth between 5 and 10) it then finds itself constantly near 10. The long term will adjust the range to 7 and 12 and see if the O2 operates correctly in that range. The numbers given mean nothing, just used as an example. Hope this kind of makes sense.
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@boraxman avatar
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UTC quote
Thanks for the explanation ^^^^^
@treppenwitz avatar
UTC

saggezza di scala
2009 'Burma Shave' Red GTS 250ie
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Location: Israel
 
saggezza di scala
@treppenwitz avatar
2009 'Burma Shave' Red GTS 250ie
Joined: UTC
Posts: 7052
Location: Israel
UTC quote
I briefly considered going from 250 to 300 when my engine seized up after 130K+ kilometers. But a totaled low mileage GTS 250 became available in my shop, so I just swapped out the engine and have been slowly scavenging parts off the donor-scooter as mine break or wear out.

At some point I'll have my shop rebuild the old engine so it will be ready for service when I finally run through this one.

Not saying you shouldn't consider going the route you're considering. But there is some comfort in knowing that a same-same swap will be a perfect Form, Fit, Function (FFF).
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