I have long heard of the qualities of Seafoam for cleaning our old carbies but could never get it as it seemed to be a US only deal...no longer thanks to Amazon Australia,

https://www.amazon.com.au/gp/product...?ie=UTF8&psc=1
I have a bottle on order that I will try on my Yamaha F80 carbed outboard that is running badly and might put a little in the CBR for fun.