Regardless I still plan to change it consider my bike already 10 yrs old and I still need another 1 or 2 at least 30mins heavy rain session to confirm the stutter and stop issue are really gone.

By the way consider my Air filter has no foam inside for god know how long so there definitely a good route for the wet air to get inside the carb ...

Yeah I just put in a new sponge, the original one already turn into ash by heat after decade without any proper service. As a matter of fact I don't even know there is a air filter to begin with until 2 weeks ago.

By the way you mean oil the sponge first before install ?? Why ??
[attachmentid=11492058]
[attachmentid=11492059]