Those quoting probably don't run standard Lambretta's.
Not all standard Lambrettas were quoted at 4%.
I believe the answer is in the oil. Back in the day Lambrettas were designed so one could rock up at any petrol/gas station and mix varying weights of mineral oil with the fuel. They recommended 4% .
That's because modern oils are much better that what was available back then, Vespa were using 2%.
That'd be a brave man on an expensive cylinder kit...mick1 wrote: ↑Fri Feb 23, 2018 2:13 pmThe primary use of the oil is to lubricate the crank. With vespas have the induction directly over the crank, the crank is directly lubricated, hence the 2%. With Lambrettas having modern, improved, cranks and better quality cylinders, pistons and 2 stroke oil then running 2% is achievable. I think some wrote about trying at 1%
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