Scooterotica

Hi stage tuning freaks! here is a new thread about what german people call o-tuning: standard top end, crank, ignition and lots of appaloosas right out of it.....

PX standard barrel is a crap, 9,5 hp out of the box, seize and pinging all the time: a tuner nightmare....

Olivier, main moderator of scootentole (bigger french vespa-lambretta forum) told me: hey FF Why don't you do me a mild tuning with a bit of extra power and revs? No need to ask twice Frog to get ready with his cutting tools....

The project is:
E:175°
T:120°
I: 178° with 123°(btdc)-55° light flowing. overlap:3°
Lets start by inlet: 123°-55°
Sip road, SI24 E or G, lightened flywheel.

Engine is a motovespa (motoplat ignition) PX200 seized but in a relatively good state:



piston before its one way ticket to the bin:





barrel needs a reboring or a change:



inlet in progress:





an old barrel of mine in a better state: everything is small, badly build and rough...


let's begin the moviluty cure:





after a few in-out in-out:











boost port:







almost finished:







next step: exhaust and crank....

spot on

timing with a std crank and 0,2mm gasket:
119/164°
with a 0,8mm base gasket:
123/167,5°
sounds better like this...

Yep I can see where your going with it..
Ralph saxleby use to do a standard p200 setup BUT TUNED of course and would guarantee 80mph +
oh an I think he used a leovinci pipe too but everything else as piaggio intended
There was a girl in the local club who had one done and it was pretty damn quick....

What piston you using and are you altering it ?

I'll take my previous o-tuning GS piston. ready to fit and still in a good shape.
inlet timing with its motovespa crank is quite unusual:
105° btdc/75° btdc 180° but shifted to the retard: Don't like this at all: too much blow-back and unecessary timing for an engine that won't rev beyond 8000....
timing with a std italian crank:
117°/53°



pics of my own o-tunig 200 posted in the "welcome" section some times ago: This is a more tuned engine with bigger ports and timing:

wish my dentist had your skills

he's only nazi?

loving those crank mods ,nice work

Really interested in seeing this go.Anything that would pass the Spanish MOT and hopefully cost effective.
Always like to see standard stuff reused.