So the Vespa is running like a top, so what’s the first thing you do when it’s all good…? You mess with it!
So this day gets a Sito Plus exhaust. This was a semi easy install. The fit was about 1/4″ off though so I really had to push and pull on the bike to get it to bolt directly in. Word to the wise, Have two people around when doing this. I pulled the bike right down on top of myself while I was laying on the ground…CRASH. Right on top of me and off the jack and jack stands I used to prop the bike up. Luckily my 15 yr old son, Killian, was there to save my ass! YAY!
So below is the stock exhaust next to the Sito Plus. You will notice the size difference..you will loose a little ground clearance, but not enough to really worry about unless you’re a track racer..and in that case you wouldn’t run this pipe anyhow.
After bolting up this pipe – it’s recommended to up your main jet size on your stock carb. I’m running a stock 24/24. Just for the record, the following is STOCK:
venturi size: 24 mm
main jet: 116/100
slow running jet: 160/100
throttle valve: 8492.4
mixer tube: BE 3
atomiser: 300/100
starter jet: 60/100
You should only have to swap out the 116 main Jet. Recommended to go to 118. Some people jump to a 120 and this might help too as it should run a little more rich on the top end. Keep an eye on your spark plug…black is too rich, white is too lean (Lean when smaller, rich when higher number). Most people I know running a 120 main jet do so with no air filter and no carb box top. I went to a 118 and it runs just fine but time will tell how it breaks in.
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