Carb main jet et2
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Custom vespa et2
Joined: 31 May 2019
Posts: 7
Location: Wicklow, Ireland
Tue Jun 11, 2019 12:53 am quote
Hey guys, just bought a new 17.5mm carb for my et2 has been parked up for years and seals were gone on the old 12mm carb, I have the new carb in and have a red malossi air filter in the box with the snorkel removed. I don't know what size main jet came in the carb as it wasn't marked. I have steadily gone up in size till I was at an 88 main jet and with the air mixture screw all the way in the bike is still running a little lean. Am I missing something? Has a Leo vinci pipe. Thanks
lx 50
Joined: 09 Oct 2017
Posts: 864
Location: Brighton
Tue Jun 11, 2019 2:32 am quote
Put the air box fully back on with the stock filter mate.

You do not need the red, not even nearly.

Then youíll probably start winding stuff back and lowering your main jet.
ET2 2004
Joined: 27 Oct 2018
Posts: 64
Location: UK
Tue Jun 11, 2019 6:50 am quote
As Bill says I'd just go with the standard black filter and closed airbox. From memory mines got a 62 main jet and the standard type filter, the plug is a good colour and it does high 40's mph on the speedo (so low 40's in reality then...). It ran like absolute crap a few weeks ago and all it was was the airbox wasn't quite snapped shut properly

GTS 250ie Super, BV250, Italjet Velocifero, Scarabeo 150, S50,ET4
Joined: 22 Nov 2016
Posts: 338
Location: Winston-Salem, NC
Thu Jun 13, 2019 5:56 pm quote
How do you know it's lean? Is it only lean at WOT or idle and mid throttle?
Your air/fuel screw is only for the idle, if it's all the way in then your pilot jet is too big. This has nothing to do with being lean for much above idle but is still a problem. 88 sounds like a good place to start if it's to lean go to 90. I would get the pilot jet sorted out then go to the needle and slide for mid range then worry about the main jet.
lx 50
Joined: 09 Oct 2017
Posts: 864
Location: Brighton
Thu Jun 13, 2019 9:52 pm quote
This is just a thought.

The LX50 2 stroke, stock had in its earlier years a 57 main jet, then on later models it went up to 63.

What is actually different between the ET2 and LX50 2T?

My LX then had a 70cc head, performance exhaust, variator....the works, and I was still under a 70 main jet from memory.

If there fundamental differences then discount everything Iíve said, but if they are the same 88 seems way too high.
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