Vespa grande backfires above 25, won’t go faster

Ľ̷̝̽͒i̶̛̼͑͠ȁ̸̧̛̽m̵̻̟̯̀̅ ̷͎̙̽̊F̶̲̺͑̓ F /

I just got my Vespa back together, and took it for its maiden voyage. At first it was going fine, but once it got up to tempature after around 10 minutes of riding, it began to backfire with loud pops coming out of the exhaust. I am running a 40:1 mix, it is about 45 degrees out. I am not running a an air filter and it has the stock carb and jetting. Is it becoming too rich?

Re: Vespa grande backfires above 25, won’t go faster

too lean, the stock airbox n sceen filters richen up the mix.

Re: Vespa grande backfires above 25, won’t go faster

Yes to what Pat says. I am surprised you can get out of the driveway with out it lean popping and bogging. They dont like to run with no filter.

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