there are new o-rings out for the carbies i put some in my 5 port
this is the number on mm website
NEW MM Carb Seal Kit
[MMCO]



New MM Carb Seal Kit comes with 10 carb seals for HSN and LSN needles and some Midrange needles.. Will suit Most carbs including Go, OS , Nova , HPI,Thunder Tiger, Hyper.

Comes with 5 x 6.5 mm OD and 5 x 6.9 Mm OD seals. These are made from HDPE Nitrile Compound which is flake and fuel resistant.