OP
UTC

Hooked
'81 Vespa P200e, '85 Vespa PX125e, 1985 T5
Joined: UTC
Posts: 358
Location: St. Catharines, Ontario
 
Hooked
'81 Vespa P200e, '85 Vespa PX125e, 1985 T5
Joined: UTC
Posts: 358
Location: St. Catharines, Ontario
UTC 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!
@birdsnest avatar
UTC

Not So Moderator
VNB VSC 09C VMA VSX - vbc vmb
Joined: UTC
Posts: 8039
Location: Hustletown, TX
 
Not So Moderator
@birdsnest avatar
VNB VSC 09C VMA VSX - vbc vmb
Joined: UTC
Posts: 8039
Location: Hustletown, TX
UTC 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
UTC

Hooked
'81 Vespa P200e, '85 Vespa PX125e, 1985 T5
Joined: UTC
Posts: 358
Location: St. Catharines, Ontario
 
Hooked
'81 Vespa P200e, '85 Vespa PX125e, 1985 T5
Joined: UTC
Posts: 358
Location: St. Catharines, Ontario
UTC quote
I figured as much!
Thank you!

Does anyone else have any references that verify this? Thanks so much.
@finyoshi avatar
UTC

Addicted
Parmakit Primavera -74, Polini Primavera -68, VR-One 228 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: UTC
Posts: 540
Location: Finland
 
Addicted
@finyoshi avatar
Parmakit Primavera -74, Polini Primavera -68, VR-One 228 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: UTC
Posts: 540
Location: Finland
UTC quote
Friend of mine also has a 125 4-speed engine on his 90 frame so no issues there.
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
Posts: 2022
Location: Racing Capital of the World
 
Ossessionato
@gickspeed avatar
Joined: UTC
Posts: 2022
Location: Racing Capital of the World
UTC quote
The only issue you might have is trying to take out the spark plug.
@greasy125 avatar
UTC

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: UTC
Posts: 14786
Location: The state of insanity, SoCal
 
Sergeant at Arms
@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: UTC
Posts: 14786
Location: The state of insanity, SoCal
UTC 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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