Choosing the main jet on a suzuki DF2.5

[madabouttheboat]

I need to replace the main jet on a Johnson 2.5 4 stroke, which is basically a suzuki DF2.4. It is a 2007 model J2R4SU ser no S35030486

It's part number 3 on the parts diagram, but they list three different types/sizes. (68, 70 and 72)

If I look it up as if it were in Suzuki colours, there are even more choices. (62, 64 and 66 as well as the above three)

I'm guessing this has something to do with the jet size. Does anyone know whats what? @VicS

There is nothing on the old jet. Do I just go with the middle option (70) and hope for the best?

 

[greeny]

Looks like the only one in stock is #3. and they have 10 of them. Maybe that suggests that is the one that is normally required so they keep a healthy stock. Or does it mean they never sell that size? who knows. Only ten dollars - worth a punt in the absence of other advice?

 

[greeny]

https://www.marineengine.com/boat-forum/threads/suzuki-or-me-whos-right-2-5hp.393528/ Maybe a clue in this forum post for you.