YAMAHA RD 500 V4 Low-Speed EGT readings

Low speed ride with Yamaha RD 500 V4 for measure EGT on 1 upper & 1 down cylinder. Testing 207mm MainJets on OKO 34mm carburetors. The 207mm MainJets are way to big, engine is running very rich, doesn’t rev well above 7 000rpm.