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Rebuilding an FCR 39 MX Carb
Posted: Mon Apr 27, 2026 8:17 pm
by beepbeep
Finally got the WR450F out of storage, as it's been sat for a while withoiut the fuel being drained thought it would be wise to give it a quick clean.
After ordering the rebuild kit and opening it up, it needs more than a spray of carb clean and a wipe over.
Can anyone recommend where I can get this ultrasonically cleaned before I starte the rebuild?
Thanks, Mike
Re: Rebuilding an FCR 39 MX Carb
Posted: Mon Apr 27, 2026 11:29 pm
by MyLittleStudPony
Hasn't Julian got one of those ultrasonic baths? Maybe he'd do it for a ha'peth of gruel. I think he's in Suffolk somewhere.
Re: Rebuilding an FCR 39 MX Carb
Posted: Tue Apr 28, 2026 7:50 am
by Count Steer
If there's no-one local that can offer free use of a cleaner, a 3 litre one is about £74 on Amazon. Handy thing to have.
Hmmm...3l may not be enough, see thread here...
viewtopic.php?t=10844
(It also gives some idea of who has one and, with a bit of detective work, where they are.

I know one is near Chichester and another in the Norfolk/Suffolk region. Pretty sure there's a Surrey one too).
Re: Rebuilding an FCR 39 MX Carb
Posted: Tue Apr 28, 2026 8:27 am
by Rockburner
beepbeep wrote: Mon Apr 27, 2026 8:17 pm
Finally got the WR450F out of storage, as it's been sat for a while withoiut the fuel being drained thought it would be wise to give it a quick clean.
After ordering the rebuild kit and opening it up, it needs more than a spray of carb clean and a wipe over.
Can anyone recommend where I can get this ultrasonically cleaned before I starte the rebuild?
Thanks, Mike
Where are you based in the UK?
Re: Rebuilding an FCR 39 MX Carb
Posted: Tue Apr 28, 2026 10:21 am
by beepbeep
I'm based in London, but can travel a bit. din't realise they were so reasonably priced to be fair!
Re: Rebuilding an FCR 39 MX Carb
Posted: Tue Apr 28, 2026 10:34 am
by Rockburner
beepbeep wrote: Tue Apr 28, 2026 10:21 am
I'm based in London, but can travel a bit. din't realise they were so reasonably priced to be fair!
As said in that other thread - just make sure that IF you buy one, it's large enough to fit your largest component.