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 Post subject: Carb bellows?
PostPosted: Sun Feb 11, 2018 3:40 pm 
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On the street

Joined: Tue Aug 22, 2017 5:29 pm
Posts: 15
Country: Canada
Bikes owned: Original owner GT550L
Why do the carb bellows turn to goop??
I bought a parts bike that had been in a storage container since the late seventies and the bellows had melted! I've picked up several sets of carbs over the years with the same liquid goop where the bellows used to be! BUT, my GT550L still has the original bellows after 150,000 plus miles!
Any thoughts as to why?
Cliff!


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 Post subject: Re: Carb bellows?
PostPosted: Mon Feb 12, 2018 1:37 am 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2159
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
Ethanol and not moving to keep the bellows mobile imo.


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 Post subject: Re: Carb bellows?
PostPosted: Tue Feb 13, 2018 1:04 pm 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 838
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
Ethanol since the late 70s?
I would think the cause is the type of rubber used being susceptible to chemical attack and/or degradation. I too have had several sets of carbs with melted rubber goo on them. Try silicon spray on your new ones to see if that helps them last longer.


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 Post subject: Re: Carb bellows?
PostPosted: Tue Feb 13, 2018 6:05 pm 
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On the street

Joined: Tue Aug 22, 2017 5:29 pm
Posts: 15
Country: Canada
Bikes owned: Original owner GT550L
New ones? Why? The ones on my bike are original!! The pic was just for reference!


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 Post subject: Re: Carb bellows?
PostPosted: Wed Feb 14, 2018 7:39 am 
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Novice racer
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Joined: Wed Jan 18, 2012 8:01 pm
Posts: 930
Location: North of Albany, NY
Country: USA
Bikes owned: T500R (now), T500M (30 yrs ago)
Ozone.


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 Post subject: Re: Carb bellows?
PostPosted: Wed Feb 14, 2018 2:30 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2159
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
Sabotage by Harley riders (someone had to tell them what to do!) :roll:


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 Post subject: Re: Carb bellows?
PostPosted: Wed Feb 14, 2018 5:01 pm 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 838
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
Alan H wrote:
Sabotage by Harley riders (someone had to tell them what to do!) :roll:

:lol: :lol: :lol: love it!


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 Post subject: Re: Carb bellows?
PostPosted: Sun Feb 18, 2018 10:27 am 
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On the street

Joined: Sun Nov 30, 2014 3:41 pm
Posts: 23
Location: New Jersey, USA
Country: USA
Bikes owned: GT550, TS400
I'm on my third set of bellows. Sets 1 and 2 both turned to goop when the bike sat for extended periods (5 years or more). I also thought that ethanol might be the culprit (the first set dissolved in the 1990's). Now when I put the bike up for the winter I drain the gas tank and run the engine until the carbs run out of gas. So far so good, fingers crossed!


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