OP
@pigletpilot avatar
UTC

Molto Verboso
Gina, 1965 Vespa 180SS, Bella,1968 Vespa 150 Super, Mia, 2017 Vespa Primavera 70th Anniversary 150ie, Gabriella, 2017 GTS300 ABS
Joined: UTC
Posts: 1887
Location: Hamilton/Kirikiriroa, NZ
 
Molto Verboso
@pigletpilot avatar
Gina, 1965 Vespa 180SS, Bella,1968 Vespa 150 Super, Mia, 2017 Vespa Primavera 70th Anniversary 150ie, Gabriella, 2017 GTS300 ABS
Joined: UTC
Posts: 1887
Location: Hamilton/Kirikiriroa, NZ
UTC quote
As I noted elsewhere I recently had Gabriella serviced at 20000km. As part of that I asked them to fit my 2nd hand Akrapovic exhaust. At 10000km we fiddled with the rollers to try to flatten the acceleration and appeared to improve things. With the new exhaust the shop felt it needed more help and we have lighter weights to try to hold it in a "lower gear". Initially the scooter seemed quick off the mark, but if the throttle is wound open to beat the traffic across an intersection I'm first across the white line but the acceleration from then on is disappointing - I described it to them as being as flat as a turd 💩.
We are trying to figure out if the exhaust is causing the problem, or the weights being too light, or something different like the clutch taking up too quickly and too well. It was in amazing condition when we looked at it, what wear there is is very even, but minimal.
So, has anyone got experience with adding an Akrapovic HP to a 300GTS [2017)? If so, what are we missing?
@srd0060 avatar
UTC

Enthusiast
2022 HPE 300 tech/ 91 PX 200e/97 PX 200e
Joined: UTC
Posts: 89
Location: Australia
 
Enthusiast
@srd0060 avatar
2022 HPE 300 tech/ 91 PX 200e/97 PX 200e
Joined: UTC
Posts: 89
Location: Australia
UTC quote
pigletpilot wrote:
As I noted elsewhere I recently had Gabriella serviced at 20000km. As part of that I asked them to fit my 2nd hand Akrapovic exhaust. At 10000km we fiddled with the rollers to try to flatten the acceleration and appeared to improve things. With the new exhaust the shop felt it needed more help and we have lighter weights to try to hold it in a "lower gear". Initially the scooter seemed quick off the mark, but if the throttle is wound open to beat the traffic across an intersection I'm first across the white line but the acceleration from then on is disappointing - I described it to them as being as flat as a turd 💩.
We are trying to figure out if the exhaust is causing the problem, or the weights being too light, or something different like the clutch taking up too quickly and too well. It was in amazing condition when we looked at it, what wear there is is very even, but minimal.
So, has anyone got experience with adding an Akrapovic HP to a 300GTS [2017)? If so, what are we missing?
Ever heard of Back pressure, it might bee worth a read. Also swap the exhaust back and leave the weights to see if it changes.
UTC

Member
Red 2016 GTS 300. Marrone etna 2012 GTV 300 Vie Della Moda. Maui Blue 1977 Suzuki A50P (AP50)
Joined: UTC
Posts: 39
Location: Northumberland
 
Member
Red 2016 GTS 300. Marrone etna 2012 GTV 300 Vie Della Moda. Maui Blue 1977 Suzuki A50P (AP50)
Joined: UTC
Posts: 39
Location: Northumberland
UTC quote
I always find they are better left standard.
Vespa spends millions designing them
@steelbytes avatar
UTC

Veni, Vidi, Posti
2019 GTS300 Supertech E3 59,000km
Joined: UTC
Posts: 5430
Location: Batmania aka Melbourne, Australia
 
Veni, Vidi, Posti
@steelbytes avatar
2019 GTS300 Supertech E3 59,000km
Joined: UTC
Posts: 5430
Location: Batmania aka Melbourne, Australia
UTC quote
My guess, wrong roller weights. Doubt it's an exhaust issue. But I'm just guessing
@juan_orhea avatar
UTC

Molto Verboso
S150 '09, Beo 500ie '08
Joined: UTC
Posts: 1238
Location: Bermuda
 
Molto Verboso
@juan_orhea avatar
S150 '09, Beo 500ie '08
Joined: UTC
Posts: 1238
Location: Bermuda
UTC quote
It isn't a question of "wrong" weights, the issue is that the intake/displacement/exhaust/weights/variator shape/clutch spring/transmission gears are an interrelated system. These components were selected together by Piaggio, but you modified first the roller weights (to your liking) and now the exhaust and the roller weights again (not so much to your liking). The shop took a guess on the second roller weight change and you don't like the result. So change them some more! It's a trial and error process unless you have a dynamometer. If you're running out of acceleration too soon, I think the rollers need to be lighter.
OP
@pigletpilot avatar
UTC

Molto Verboso
Gina, 1965 Vespa 180SS, Bella,1968 Vespa 150 Super, Mia, 2017 Vespa Primavera 70th Anniversary 150ie, Gabriella, 2017 GTS300 ABS
Joined: UTC
Posts: 1887
Location: Hamilton/Kirikiriroa, NZ
 
Molto Verboso
@pigletpilot avatar
Gina, 1965 Vespa 180SS, Bella,1968 Vespa 150 Super, Mia, 2017 Vespa Primavera 70th Anniversary 150ie, Gabriella, 2017 GTS300 ABS
Joined: UTC
Posts: 1887
Location: Hamilton/Kirikiriroa, NZ
UTC quote
Juan_ORhea wrote:
It isn't a question of "wrong" weights, the issue is that the intake/displacement/exhaust/weights/variator shape/clutch spring/transmission gears are an interrelated system. These components were selected together by Piaggio, but you modified first the roller weights (to your liking) and now the exhaust and the roller weights again (not so much to your liking). The shop took a guess on the second roller weight change and you don't like the result. So change them some more! It's a trial and error process unless you have a dynamometer. If you're running out of acceleration too soon, I think the rollers need to be lighter.
Thanks for the input. In jest I suggested they put it on their non existent dynamometer. They are keen to work to get it at least how it was so we will continue. Their thought is that we are being thwarted a little by a fuel map designed to comply with Euro regulations and we are dancing around it trying to overcome the dead spot created. The option of going back to original remains.
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