SOHC.co.uk Forums > CB350/400
White deposits in carbs from Ultra Sonic cleaner
Nurse Julie:
Progress made, crisis averted :). Put loads of carb cleaner in every orifice I could find on the carbs and took up local workshop and they gave them a really good blow out. But, prior to this the slides were totally seized, or the mechanisms that moves the slides up and down were seized so had to kept putting a mixture of WD40 and carb cleaner in and was gently levering the bit where the throttle cables attach and eventually they started freeing off 1 by 1. Managed to accumulate some of the white powdery deposit, definitely a calcium type deposit, can feel a very slight grittiness to it. It melts totally in carb cleaner and WD 40 but not fully in water, it forms a paste. My first experience of Ultrasonic cleaning on carbs, lesson learnt, won't be going that route again anytime soon ;D ;D ;D
Trigger:
Not understanding where the grittiness has come from ? You put the carbs in a ultrasonic machine, wash out with hot water, blow out with air line until dry and squirt a little wd40.
Nurse Julie:
The grittiness was definately in the white powdery deposits. Maybe grit is a too harsher word for it but you could feel something when rubbing it between you fingers, sort of like a paste.
fisjon:
Hi Julie,
I take it you paid for this to be done, if so you should take them back and get them done again. If they moan about it just tell them that you will let everyone know that they do inferior work.
If any of the 'grit' is left inside the air/fuel tubes then you are going to have probs. I had an ultrasonic cleaner and I had nothing like that in any of the work I did. for an example see photo.
Everything I put in came out clean as a whistle with no crud or powder. I suspect they are not using the correct cleaning agent.
john
Clem2112:
Nothing wrong with ultrasonic cleaning if its done right :)
I did some research before I took the ultrasonic route.....
The media should not be too aggressive and something like Sea Clean is considered safe for alloy carb bodies.
Using acidic or alkaline fluids or ones containing abrasives are not a good idea.
The carburettors need to be completely stripped first - the liquid needs to be able to get into all the passages and voids and be free to drain out afterwards.
Jets and other loose parts can go in too but I don't know if the tiniest holes allow much liquid through?
It's essential to blow out all these internals with compressed air after cleaning.
After drying in a warm airing cupboard I sprayed the outsides with WD40.
Total cost £40 for a small cleaner and £8 for the fluid.
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