SOHC.co.uk Forums > CB350/400

My 400/4

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kent400:
Having removed and re-fitted  a bank of 400f carbs only last weekend my memory of the task is very fresh! Yes the task is a bit of a pig. Just to add to the good advice above, you need to loosen the clip on the airbox where it joins air filter/battery box and pull out the oval tube from the inside of the box. The air box and the carbs come out on the right hand side. Fortunetly the air box rubber are still good, a spot of WD40 on the inside of air box rubber helps them slip on a little easier. Take a note of the route of the 4 overflow hoses and the 2 breather hoses. There is also a larger hose on the bottom of the airbox. Feeding these hoses down the back of the engine upon re-assembly is a bit of a fiddle.

Dan:
When I had the old hard rubbers I should have tried your method Kent.
I guess as you get to learn your bike you find your own way and methods.  If there's room to get the carbs and air box into the frame together my swearing vocabulary would be a bit smaller :-)

hondatri:
Hi Guys Thanks for info on your experiences . I saw on another site that a Strap around the Airbox and pulling back gives more room by 1/2".Fingers crossed as job progresses. Anyone have idea of cleaning parts in Sonic cleaner or is Carb cleaner enough.

Lobo:
Sonic cleaner... the general consensus seems to be "yes".

But... I bought a cheap sonic cleaner from ebay (£100 thereabouts & intended for jewellery / watch straps etc)... and wasted my money. It wasn't beefy enough (I now realise), and you also need the right cleaning agent... which I didn't really appreciate. If the parts were actually cleaned it was likely more to do with the long / hot soak in a warm cleaning fluid! (it was heated)

What I'm trying to say here then, is sonic cleaning prob very good if done by someone who has the right equipment / knowledge etc.

I also forced pressurised carb cleaner etc through the galley ways... I got them clean in the end through a variety of means versus, simply, a sonic cleaner.

kent400:
I too have a heated ultrasonic cleaner and I share lobo's views. However they do work rather better with a special carburetter cleaning fluid. The fluid I have is produced by R & D Laboratories, it's used at 80c There are fluids listed on ebay and whilst it does improve the cleaning process it's not a 'silver bullet' as far as carb cleaning is concerned. Will shift the general dirt and grease. Carb cleaner in a spray can is effective.  The unheated cleaners are not much good, well good for cleaning false teeth apparently

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