Aerox, malossi sport mainjet

Jonas87

Well-Known Member
Hello. Which mainjet size should I use on a yamaha aerox 2004 with this setup: 17.5mm phva ts dellorto carb(A20 needle), malossi sport 70cc, yasuni R exhaust, polini reed valve, malossi multivar(7g rollers) and with completely standard filterbox. Jet size 75 is the best of them all when it comes to throttle response and power.
It also run up to jet size 88 with loss of power, with jet size 90 its start to booging ( spluttering ) I dont want it to run lean, but I also dont want to have to much power loss. What is the most healthy and best jet size for my setup? If someone have a similar setup I will like to know which mainjet size that was used. Remember: standard airbox.
 
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