O-tuning Olivier's px200

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fastfrog
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Main scooter: T5 mk1, SS180, PX200 millenium
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Tue Mar 04, 2014 5:23 pm

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:

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piston before its one way ticket to the bin:

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barrel needs a reboring or a change:

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inlet in progress:

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

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let's begin the moviluty cure:

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after a few in-out in-out:

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boost port:

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almost finished:

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next step: exhaust and crank....
Size matters!

ducksta
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Tue Mar 04, 2014 5:46 pm

spot on
live life your a long time dead

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fastfrog
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Main scooter: T5 mk1, SS180, PX200 millenium
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Tue Mar 04, 2014 8:46 pm

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

225worb
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Tue Mar 04, 2014 8:55 pm

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.... :o

mick1
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Tue Mar 04, 2014 9:09 pm

What piston you using and are you altering it ?

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fastfrog
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Main scooter: T5 mk1, SS180, PX200 millenium
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Tue Mar 04, 2014 9:57 pm

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°

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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:

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Size matters!

ducksta
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Tue Mar 04, 2014 10:09 pm

wish my dentist had your skills :)
live life your a long time dead

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fastfrog
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Joined: Fri Dec 27, 2013 3:37 pm
Main scooter: T5 mk1, SS180, PX200 millenium
Location: Paris, Taxes
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Tue Mar 04, 2014 10:19 pm

he's only nazi?
Size matters!

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sean brady scooters
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Thu Mar 06, 2014 8:04 pm

loving those crank mods ,nice work :)
Sean Brady Scooters - 01765 690 698

vespaloco
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Thu Mar 06, 2014 8:14 pm

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

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