5D58 or 9

[Sidman]

Hello , firstly what a great site this is , a font of information .
My question is , I have a 1985 GS1100G Australian delivered bike that is totally standard , the carb specs state that it should have a5D58 needle but it has 5D59's fitted to all 4 carbs , are these needles richer or leaner . It goes ok but I think abit lean . Did Suzuki lean them off more and more as the years went by to meet emission regulations , thanks Sid

[Tom R]

It’s not as straight forward when reading OEM needles as it is off the Mikuni charts.... in this case I think it means adjustable or not..... same needle otherwise.

[Guest]

Dunno how much it'll help as the 5D series isn't listed but here's the 5 series selection available: https://www.mikunioz.com/shop/jet-ne...v=6cc98ba2045f

If it helps at all the stock CV's I've loaned for the Kat also have the 5D59 needle in them.