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1200 Sport - tank leaking

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guzzigraham View Drop Down

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Post Options Post Options   Thanks (0) Thanks(0)   Quote guzzigraham Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2019 at 09:52
Further to Brian's comment, I suspect that the Nylon of a Guzzi (Acerbis) tank is more ethanol proof than some of the other plastics used. Regardless, there is enough of the vapour which gets into them for the material to swell slightly. In contrast my old Triumph Tiger 955 (on a '52 plate), looked like it had a case of the 'Pox' by the time I sold it. The vapour gets through the plastic and is trapped under the paint causing wholesale blistering on most. They also swelled enough to make fitting them back on after a spot of maintenance a challenge. It's rare now to see bikes of that era from Triumph (and others) without something going on with the paint... or a new paint jobs been done to give it a few more unblemished years. Not something I've noticed on Sports, Norges or Brevas, which is why I think they are at least a little more ethanol resistant.

I am guessing that the switch to ethanol content in fuel was not foreseen so soon, and/or an appreciation of it's effects were not well understood by the bike industry. I hope that since then some more thought has gone into the tank materials and what can happen during ownership. Seems now to be such a common problem with bikes from the 2000's which is a shame. As far as Guzzi's go, I love the motor and the Sport has a great feel, so I will keep mine for a while yet.
1200 Sport - new to me 2016
T3 California - long gone
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motomike1400 View Drop Down

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Post Options Post Options   Thanks (0) Thanks(0)   Quote motomike1400 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2019 at 15:41
My 2010 V7Classic suffered the swollen tank blistering paint problem... eventually leading to a constant cloud of vapour around the bike. Rather than wait for the inevitable fire ball i sourced a NOS chromed tank from the Racer version. Looked good too on a black bike. I treated the inner to a coating of ethanol proof far, so good. Fingers crossed.
Course, now the initial problem of the chromed tanks has surfaced...peeling chrome. So now considering a vinyl wrap to make the bike all black again. About £20 for DIY kit and easier than paint. Worth a try.

V7 classic.
T'other brands .
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2019 at 16:51
My Norge tank has no paint blistering at all, so in that respect it is better than those on the small blocks.
But it has certainly grown in length. The top yoke now hits the tank on full lock and the rear bolt hole has had to be elongated by about 1cm in order to get the bolt in.
I suspect if the bolt is forced in without elongating the hole, then the tank will be sufficiently stressed to crack.

Better 5 minutes late in this world than years early in the next.
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2019 at 19:38
Originally posted by Dave P. Dave P. wrote:

What was wrong with steel tanks ??? Don't tell me,let me guess.PROGRESS !!
Bah humbug!!

I guessed because you'd need a big press and expensive moulds, and lo  .....

Mind you I hadn't considered how differently each type might behave in a collision.

"Chicken nuggets don't dance on a Tuesday."
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