OP
Mon, 05 Dec 2022 18:12:49 +0000

Hooked
'81 Vespa P200e, '85 Vespa PX125e, '70 Vespa 90 basketcase
Joined: Fri, 12 Jun 2020 02:20:51 +0000
Posts: 255
Location: St. Catharines, Ontario
 
OP
Hooked
'81 Vespa P200e, '85 Vespa PX125e, '70 Vespa 90 basketcase
Joined: Fri, 12 Jun 2020 02:20:51 +0000
Posts: 255
Location: St. Catharines, Ontario
Mon, 05 Dec 2022 18:12:49 +0000 quote
Hey all,

Just debating with a friend about the specifics of an engine swap into a v90.

He states the 4 speed ET3 engine won't switch to 4 gear in a v90 chassis bc the shifter tube won't allow you to switch past 3rd gear.

I disagree but I really don't know for sure.

If I were to compete this engine swap, would I need to change the shifter tube from 3 to 4 speed as well?

Thanks for your input!
Mon, 05 Dec 2022 18:35:21 +0000

Not So Moderator
VNB VSC o9c VMA vbc vmb VSX
Joined: Wed, 28 May 2008 17:31:07 +0000
Posts: 6779
Location: Hustletown, TX
 
Not So Moderator
VNB VSC o9c VMA vbc vmb VSX
Joined: Wed, 28 May 2008 17:31:07 +0000
Posts: 6779
Location: Hustletown, TX
Mon, 05 Dec 2022 18:35:21 +0000 quote
Pretty sure-o your friend is wrong-o.

Resisdent cool guy Poi Dog swapped a pv125 engine into his 90 frame/headset and it shifts to 4th with no issues at all. Shift tubes are the same to my knowledge. Only issue would be if it's a pre 66 90. But, that has to do with the engine spigot that goes through the frame, not the shifter.
OP
Mon, 05 Dec 2022 18:40:10 +0000

Hooked
'81 Vespa P200e, '85 Vespa PX125e, '70 Vespa 90 basketcase
Joined: Fri, 12 Jun 2020 02:20:51 +0000
Posts: 255
Location: St. Catharines, Ontario
 
OP
Hooked
'81 Vespa P200e, '85 Vespa PX125e, '70 Vespa 90 basketcase
Joined: Fri, 12 Jun 2020 02:20:51 +0000
Posts: 255
Location: St. Catharines, Ontario
Mon, 05 Dec 2022 18:40:10 +0000 quote
I figured as much!
Thank you!

Does anyone else have any references that verify this? Thanks so much.
Mon, 05 Dec 2022 19:59:19 +0000

Addicted
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: Thu, 23 Jun 2022 06:30:20 +0000
Posts: 504
Location: Finland
 
Addicted
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: Thu, 23 Jun 2022 06:30:20 +0000
Posts: 504
Location: Finland
Mon, 05 Dec 2022 19:59:19 +0000 quote
Friend of mine also has a 125 4-speed engine on his 90 frame so no issues there.
Mon, 05 Dec 2022 22:32:10 +0000

Molto Verboso
Joined: Thu, 03 Nov 2011 19:17:41 +0000
Posts: 1668
Location: Racing Capital of the World
 
Molto Verboso
Joined: Thu, 03 Nov 2011 19:17:41 +0000
Posts: 1668
Location: Racing Capital of the World
Mon, 05 Dec 2022 22:32:10 +0000 quote
The only issue you might have is trying to take out the spark plug.
Tue, 06 Dec 2022 00:51:08 +0000

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: Fri, 21 Oct 2005 19:59:19 +0000
Posts: 12549
Location: The state of insanity, SoCal
 
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: Fri, 21 Oct 2005 19:59:19 +0000
Posts: 12549
Location: The state of insanity, SoCal
Tue, 06 Dec 2022 00:51:08 +0000 quote
like others said, it'll fit. if it's early small door getting at the plug is a trick but doable. just paint an extra dot on the shifter tube.

to note, you'll probably want to run new shifter cables-- at least inners when you do it.
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