bmw r80 rt cab isues

bikerbastard · L Plate Warrior Joined: 08 Dec 2011 Karma :

hi guys need some help with my 1985 bmw r80 rt i got a real issue with it pissing out petrol from the overflow. i keep trying to adjust the float heights but cant seem to get it right does anyone know the correct float height. bike has standard carbs and jetting no modifications i have had the carb totally apart and cleaned it thoroughly inspected parts under a magnifying glass no defects (as far as i can see)

Vincent · Banned Joined: 16 Oct 2006 Karma :

Take the carb off, remove the float bowl and try blowing gently through the fuel feed pipe while operating the floats by hand. Remember that the force of the floats on the needle valve when in normal operation is very slight so if their is a leak, it only needs to be while pushing very gently on the floats.If the float needles are rubber tipped, it could be that the rubber has gone hard with age. I'd try a pair of new valve needles. Also check the valve seat for any faults.
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bikerbastard · L Plate Warrior Joined: 08 Dec 2011 Karma :

thanks for the advice Vincent i'm going to try that now i will also try to take some pics of some of the parts so you can cast your knowledgeable eye over them

bikerbastard · L Plate Warrior Joined: 08 Dec 2011 Karma :

ok have tried blowing gently down the fuel hose i can detect a change when i raise the float.

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

bing carbs i take it??
my money is on the floats, the bing ones are made from a funny material kind of like foam,
it absorbs the petrol and after a while they stop floating properly,
you can get "ethanol replacements" which are made from plastic and always float Very Happy

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Vincent · Banned Joined: 16 Oct 2006 Karma :

Could it be the gasket if not the above?
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bikerbastard · L Plate Warrior Joined: 08 Dec 2011 Karma :

thanks for all the info guys after blowing through it discharged what can only be described as carb snot and now all seems to be fine just ran it on a 10 mile test ride and no more leeks also threw a shot of redex for good measure

Vincent · Banned Joined: 16 Oct 2006 Karma :

good

might be worth checking the tank and filter for crud.
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bikerbastard · L Plate Warrior Joined: 08 Dec 2011 Karma :

thanks for that thats my next port of call

Vincent · Banned Joined: 16 Oct 2006 Karma :

You will eventualy have to replace the floats as Hmmmnz says, with the "unleaded fuel" type. Might be worth doing it while you have the carbs off. Try MotoBins for the kits.
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