Aprilia RS125 Carb Main Jet Dellorto 6mm Genuine Dellorto Main Jet For Both 28mm And The 34mm Carb For The Aprilia RS125 Word of warning, there are cheaper jets out there but the "hole" in the jet that determines the size vary quite a lot! So you may be buying a 125 size but it can be a 130 or worse a 120. We always recommend using a Jet Gauge to check what size jet you have and what size you need.
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Price: £4.68 (£5.62 Including VAT at 20%)
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Jetting I bought loads of jets off eBay some even had a dellorto stamp on them but it was still spluttering so I bought a check size checker I couldn't believe it 155 main jet was bigger than my 160 so now I buy genuine dellorto from here they are a very good price think you get it wrong a top end go's bang (26/01/2016) Paul - Hull
Don’t by cheap eBay jets! I was buying cheap jets of EBay trying to set up my Aprilia RS125. I fitted a Arrow pipe, but kept having set up issues? I called up Luke@pjme for advice, he told me that the cheap jets can vary in size and the Dellorto jets are calibrated, once i had the genuine jets i set the bike up easy. (27/06/2012) Dan West - Shropshire