Performance exhaust to fit Vespa 90 with Battery Compartment
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Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Fri Mar 20, 2020 9:29 pm quote
Hey everyone! I've been on the forum for years for various reasons just never made an account or posted.
I picked up a beautiful 90 model from 1974 that has the battery for directionals.
I understand this eliminates the usage of a lot of exhausts because of left hand fender clearance issues.
I am looking for something cheap, nicely fitting as well better performance to replace my stock exhaust which had the tip knocked off at some point.
If i cant find anything in my budget, I will probably go for a nice stock replacement.
Ossessionato
Joined: 22 Oct 2011
Posts: 4365
Location: Tega Cay, SC
Sat Mar 21, 2020 6:46 am quote
I have a stock exhaust if you don't find what you want. Just pay shipping and it's yours.
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Sat Mar 21, 2020 8:15 am quote
Thanks! im gonna wait and see what other options there might be but much appreciated
Member
Joined: 22 Jul 2018
Posts: 16

Sat Mar 21, 2020 8:18 am quote
An et3 pipe fits fine. Had one on my 100 sport which has a battery tray. SIP and Scooter Center have nice ones you can choose from if you want something nicer.

Sito pipes should be available state side.

Here: https://www.scooterwest.com/small-frame-et3-muffler-sito-plus-banana-pipe-1393384.html
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 7508
Location: The state of insanity, SoCal
Sat Mar 21, 2020 1:47 pm quote
How performance do you want to go? A Leo Vince or polini noisemaker will fit, and as noted an ET3 banana as well.

If you want to keep the box and get a true expansion chamber probably a down and forward is your best bet.

-g
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Sat Mar 21, 2020 3:56 pm quote
thanks everybody. I heard some other member in a past thread saying the banana pipe hits a rectifier mounting screw. I think it was the SIP pipe though.

As far as performance goes, Just looking for a bit more overall power while changing out the stock exhaust. Looking for just a tad bit more speed in top gear.

Ive owned over a dozen mopeds and love to see how many similarities the small frame has as far as common moped parts go, same spark plug, SHA carbs used on tons of mopeds share the same Jet with the SHB. Interchangeable cables and so on.
bodgemaster
1963 GL, 1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 5111
Location: So Cal
Sat Mar 21, 2020 4:11 pm quote
ET3 would be my choice
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Sun Mar 22, 2020 3:59 pm quote
Anybody else? the SITO ET3 sounds like a good nice fitting choice.
Ossessionato
2015 GTS300, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 4376
Location: San Diego, CA
Sun Mar 22, 2020 6:51 pm quote
Polini kidney shaped for the win. ET3 will hit one of the rectifier screws but you can omit or flip it around for more clearance. But the Polini kidney is so much easier because you donít ruin a gasket every time you want it off, which makes life simpler. Performance is about the same between them but the Polini wins for ease of use.
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Sun Mar 22, 2020 7:05 pm quote
sdjohn wrote:
Polini kidney shaped for the win. ET3 will hit one of the rectifier screws but you can omit or flip it around for more clearance. But the Polini kidney is so much easier because you donít ruin a gasket every time you want it off, which makes life simpler. Performance is about the same between them but the Polini wins for ease of use.
can you post a link to the exact exhaust/ fit you are getting at? How much louder than the banana will it be? trying to make this mild, keep center stand in tact etc.
Thank you
Ossessionato
2015 GTS300, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 4376
Location: San Diego, CA
Sun Mar 22, 2020 8:03 pm quote
https://www.sip-scootershop.com/en/products/racing+exhaust+polini+banana+_20020250

The us shops stock them too. Loud is a matter of taste but I donít think itís unpleasant or too loud at all.
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Tue Mar 24, 2020 3:36 pm quote
So looks like I am leaning towards the Polini Banana. Although I must say I do trust you guys that it fits with the large battery compartment on US spec small frames, but it looks like it is gonna be super tight? before I place an order from SIP has anyone else had any trouble fitting this exhaust.

I just spent the day disassembling/ lubing the throttle/ headset, got the speedometer set up right, serviced the brakes and such.
These things are so much fun to work on!
Ossessionato
2015 GTS300, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 4376
Location: San Diego, CA
Tue Mar 24, 2020 6:04 pm quote
yeah it will fit no issues, it's pretty easy on my 74 with big battery box
Hooked
Joined: 06 Dec 2011
Posts: 437
Location: twincities
Tue Mar 24, 2020 6:25 pm quote
Fits no issues. I can't remember if you need to get rid of the exhaust elbow or just have the correct one. You can order stateside too, Mercato stocks them.
Ossessionato
2015 GTS300, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 4376
Location: San Diego, CA
Tue Mar 24, 2020 7:43 pm quote
it comes with a manifold that goes direct to cylinder, so you need the correct version for your cylinder. You don't need the stock elbow-thingy that went with some exhausts.
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Tue Mar 24, 2020 9:06 pm quote
just ordered a large part order from scoot mercato including the polini pipe. Lets hope i have the right cylinder...
Ossessionato
2015 GTS300, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 4376
Location: San Diego, CA
Wed Mar 25, 2020 7:56 am quote
it looks like the 90 uses the same cylinder exhaust height as the 125, you should be OK. are you keeping a 90 cylinder or going bigger? this should work in either situation.
Member
1974 Vespa 90
Joined: 19 Mar 2020
Posts: 9
Location: South Hadley Massachusetts
Wed Mar 25, 2020 8:45 am quote
Im gonna run it stock until it either seizes or wears out and then ill probably get the 125 cyl or malossi 135 kit.
That's gonna be pretty far into the future hopefully.
Banned
2:6
Joined: 11 Jan 2007
Posts: 7520
Location: San Francisco
Wed Mar 25, 2020 10:00 am quote
I've run the polini right hand on a our 102 and a primavera I use to have.

https://www.sip-scootershop.com/en/products/racing+exhaust+polini+for_20020550

fits nice, sounds great, and OK power
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