Carby cleaner from Burson, Repco, Supercheap Auto, etc is something that comes handy.
It's more penetrating than petrol.
Tooth brush and carby cleaner can do lot of work.
But, if the soot is bad, it may be able to benefit from trisodium phosphate bath in high temperature around 90 degrees celsius or so.(I haven't used that chemical myself, but a friend used it to clean a badly sooted carby. Not sure how long to leave the carby in the chemical hot bath though.
But, you would have to dismantle all the diaphragm parts of the carby before dipping it in any liquid.
You would need a high pressure air gun to clean the interior passages properly, combined with carby cleaner.
However, pressurized air can send interior bits like springs and balls into air and you will never find them.
So, having a cloth over it before spraying air is very important.
I think the rebuild kit sold on ebay and parts stores is the same, but don't take my word on it.
You need to be super careful when inserting the accelerator pump rubber boot. It can break very easily while trying to
install it to the hole. Use sewing machine oil or grease to lubricate the edges of the hole & rubber boot, so it won't break. None of the parts that comes in the carby repair kit are available to buy individually, so keep the old parts in case. Apply a thin layer of lithium grease on gaskets to help seat better.
Check my threads from 2013-2014. I've documented what I did with lot of photos. RB30 carby & the TB42 carby is pretty much the same. Take plenty of time to do it if this is your first carby job.
If yours on LPG take extra care and time with the cleaning.
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