Vespa ET2 plug chop help
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2008 GTS250, 2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 277
Location: Houston
Fri Jul 19, 2019 10:15 am quote
Installed a malossi 70cc Kit onto a Vespa ET2. Itís got a Malossi (Dellorto 19) carburetor, currently with an 82 main jet, stock airbox only modified with the three holes Malossi indicated in the instructions, and malossi red filter. Iíve gotten this far and performance is pretty good, just a bit more tinkering needed to get the mid range to perform and sound as good as it does when coming off the line and at WOT.

This is a plug chop done after about 4 miles on a new plug at WOT. How does this look to the tuners here?


2003 Vespa ET2
Joined: 05 Apr 2019
Posts: 278
Location: Cambridge, MA
Fri Aug 02, 2019 12:56 pm quote
can you post another having a tough time seeing the electrode
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3616
Location: Oceanside/ SF
Fri Aug 02, 2019 2:14 pm quote
Is the bottom ring on the insulator from combustion or the blade touching?

If that ring is a nice chocolate brown Iíd say your jetting is fine. Remember though you want to favor the rich side/easy rpms for your break in and then jet accordingly.

The plug pictured was a little lean if you look at the step, not where the cutting occurred. It was tan not chocolate so I went a little higher and have run that scooter for thousands of trouble free miles since.


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