KTy

Na.... ( It is one like this one (but this one is home-made by an intalian on et3.it) http://lnx.et3.it/phpBB-2.0.17/phpBB2/viewtopic.php?t=8642 Anyway, what exhaust would best match my timings ??

No

Yeah... It's a zirri silent-like up to date for the Quattrini M1 cylinder... But I just realized it has the same problem... Actually I was talking about another exhaust, maybe italian (Fabrizi ?), that has the muffler between the tyre and the belly... (Not the Polini :D)

I am just starting to look for a new exhaust that could allow me to race nicely... The zirri is very good, but it touchs a lot in left turns !! So, according to my engine spec./timings/... what would you recommend... ? HZ, Franz, M6,... etc Btw, I have finally fitted an 20mm HP4 over a PK 12V stator... Still no dyno :heul:

Ordered on lambretta-teil.de

Alloh, I have a KOSO 32, and I am looking for a choke conversion kit... SCK has: http://www.scootercenter.com/catalog/produ...roducts_id=7902 (looks good to me) and SIP has: http://www.sip-scootershop.com/pages/details.php?ID=23165 (doesn't look good :plemplem: ) Any other option or advice ? Thanks,

HUmkay... I have also checked that the previous pickup has been "sand-papered" in ordered to be clearly horizontal...

Is there a small spacer that is missing... ? Edit: For your information, it's from SCK, in a SCK packaging.

I tried the choke test at mid-rpm and instantly the engine "splutter". Two more hints: * I ran in the highway for a short time, the engine spluttered just before reaching maximum RPM. This is caused by the 130 mainjet, but I may keep it for safety... * While accelerating (throttle between 70% and 100%), if I go back to 30% of throttle while the engine is in its upper-mid-rpm range :grins:, then the engine splutter again. This time I think it is because of both my idle jet and my main jet being too big.

The safe way would be to change the clutch, it is true :D Back on the "method", Lucifer wrote So, what is the bottom line of this technik ? What should be expected ? If the engine behave "better" it means that I was running too rich, rigth ?

Yesterday, I adjusted the *mixture* screw, it is about 1 turn. Now it is fine, it is "4T-ing" only from time to time in very specific load and throttle condition. Because I don't have reed-valve and because I think the Leo pipe is not a very homogenous exhaust, I will keep this setup as a "working one". I will try what you said: AV264 + 50 idle jet + playing with the needle clip. And Btw, I have the feeling that the clutch is slipping at high-rpm under maximum acceleration... (new standard PX125 clutch)... :wasntme:

So, with 130, X2, CF262, needle clip 2nd position from top and 55 idle jet, it is almost perfect, it is "4T-ing" only at a very narrow RPM range, something aorund 1/3 of throttle. But before it's ok, and after it is also ok... It is just anoying while city-driving at low-rpm. I know this would disapear if I put the needle clip on the top position... Should I play with another needle size ? or with a different round-slide cutaway (40) ? How to make sure I am not running too lean in the upper-mid-rpm ? (paranoid !!) Does reading an EGT sensor at all RPM would help a lot ??

Thank you Lucifer I probably know why I had a mechanical defect... I had an air leak because of the rubber manifold, I couldn't find it and because of that I seized 3 times :haeh: Then you also have to know that the cylinder was overbored in its last size... Heat, mechanical stress and thin skirt should explain the broke :wasntme: As for my experimentations, I put the 130 main and at the same time I put an AV264. It was too rich from 1/3 to 3/4 of throttle. Then I put back my X2 needle clip to the top position, it was much better, but still "4T-ing" from 1/3 to 1/2 of the throttle. So, I put back the CF262 (=AV262 (?!)), I put the needle clip to the 2nd position from top, and I will tell you tomorrow ! What I am affraid of is that the Leo pipe delivers a "weak" signal at low RPM, so I adjusted the jetting to have a smooth city-ride (low and lower-mid-RPM), but because of that, I may run too lean at "upper-mid-RPM" without knowing it... What do you think ? I am still running 17-18° of timing advance. Actually, I don't want to gain revs, I want torque ! Not that easy with the Leo pipe, but that's probably one of the few that can be mounted on an 8" scooter without touching (driving solo). Is there any tweak that one can do to this pipe in order to gain torque and loose some power at high-rpm ??

Geil ! :D

Indeed, the previous crank was an original PX125E reworked (1.5cm if I remember)... You're right, usually a mettalic sound under heavy load is usually the sign of a lean mixture... We'll see I will first enlarge the main to 130, isn't that big ? :)

Back on this one :) I just have a quick question in my head... After this Polini 177 broke (the skirt broke !!), I bougth a new one along with a new mazzu crankshaft. I have now the feeling that I have to run richer, I have this metallic sound (Leo pipe ?) sometimes around mid-rpm and high-rpm. I put the needle clip on the 2nd position from the top, and the engine is not rattling or 4Ting at any rpm as it was doing before. Question is, considering enriching at mid-RPM should I switch back to an AV264 atomiser or only play with the needle ?

(

I would be interested in: -Primärzahnrad 26 Z für 2,56er -Primärzahnrad 28 Z für 2,56er - kurzen 4. DRT Btw, what about prices ?

Is there any power curves comparing a specific configuration with and without the Vespatronic ?

What about welding a bridge on the exhaust port.... ?? The idea is nice, but will it last ?? And how to make sure it is the same material ... ?

http://lnx.et3.it/phpBB-2.0.17/phpBB2/viewtopic.php?t=9427

Is this some sort of "security" to make sure there is always enough fuel ?? :plemplem:

Okay, I'll try to figure out what is important on this picture :)

Thanks, I'll check this out...

I did not investigate since I last drove it in June (there is only one "race event" here in France ), but I had the same problem on my racer every lap while I was racing: After the straigth line where I could push the 3rd and the short 4th, there were a big U turn on the left, so massive braking just before... Everytime I was pushing hard, I had "no fuel" after the first corner :plemplem: and when I was not pushing the 4th to high-rev, it was okay... Does anyone have ever had some "filling" problem with the KOSO ? Or do I have to blame my tank ? Or my engine is too *powerfull* ? We are talking about this cutty :love: : http://ktylife.free.fr/vespa/KTy133/AntoineVespaRacing4.jpg