suggestions as to why these items were in montjuic petrol tank
- Thread starter fintanoc
- Start date
Certainly the filler insert - photo 2 - is to stop fuel sloshing out. Regularly fitted to - and needed - on the 750s. You can still buy one from Greg, for example ...
damclassicracing.com.au
36210250 Rubber Insert fuel anti-surge
Laverda Parts for LAVERDA Breganze and Zane models 1969 - 2000
damclassicracing.com.au
The Sock
Hero member
- Location
- London, England
My guess is a cack-handed DPO decided to wash out the air filter foam in the petrol tank (facepalm!!!) and couldn't pull it back out.
Anti-slosh rubber, as above.
Anti-slosh rubber, as above.
well the sponge is out - I thought it was going on forever when I got a grip of it and started drawing it out. now the decision to stuff it back in or not. now to decide whether I put it back into the tank, use it as an air filter or bring it into the bath as a sponge. Thanks for your comments
- Location
- Calgary, Alberta, Canada
wouldn't put the sponge back in, looks like air filter.
The plastic insert in the fuel neck is commonly used in a usually unsuccessful attempt to stop fuel from a full tank sloshing out of the fuel filler under heavy braking, running off the front of the fuel tank, and all over the very hot exhaust headers and the rest of the front of the engine...... many of us have had that experience, usually more than once. I have spent all kinds of effort trying to get a stock fuel cap to actually seal, usually unsuccessfully. Best to try that fettling at time of painting the tank, you can adjust and bend tabs as necessary without destroying paint,
on my aftermarket carbon fiber fuel tank made by Boba I had him fit a flush mount and properly sealing aviation type fuel filler, with a separate pressure vent. The pressure vent has a drain hose that I run all the way to the back of the bike, don't want fuel on the hot exhaust or on the back tire.
the other interesting thing I have seen is where the usually leaky stock fuel cap actually seals and then there is a tank venting problem... is the fuel cap drilled through and a Dellortto main jet threaded in to provide a vent
the solution that was recommended to me is to never fill the tank more than about 3/4's, but sort of limits your range.
The plastic insert in the fuel neck is commonly used in a usually unsuccessful attempt to stop fuel from a full tank sloshing out of the fuel filler under heavy braking, running off the front of the fuel tank, and all over the very hot exhaust headers and the rest of the front of the engine...... many of us have had that experience, usually more than once. I have spent all kinds of effort trying to get a stock fuel cap to actually seal, usually unsuccessfully. Best to try that fettling at time of painting the tank, you can adjust and bend tabs as necessary without destroying paint,
on my aftermarket carbon fiber fuel tank made by Boba I had him fit a flush mount and properly sealing aviation type fuel filler, with a separate pressure vent. The pressure vent has a drain hose that I run all the way to the back of the bike, don't want fuel on the hot exhaust or on the back tire.
the other interesting thing I have seen is where the usually leaky stock fuel cap actually seals and then there is a tank venting problem... is the fuel cap drilled through and a Dellortto main jet threaded in to provide a vent
the solution that was recommended to me is to never fill the tank more than about 3/4's, but sort of limits your range.
I was thinking about purposefully adding these to the very high-mounted 25l Atlas tank, but its issue is how high the tank sits making a full tank making it very easy to tip the bike over if your not careful, sloshing isn't a big issue I have noticed YET. 2 kits needed so $160 for foam is pretty insane as well.
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Twin Air 12.5L Petrocel Fuel Tank Foam at MXstore
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TeddyG
Hero member
- Location
- Portland Oregon
I found that plastic insert inside my 750 tank- it must,ve shrunk because it doesn’t fit into the opening. The cap was leaking due to a worn gasket made of leather and I replaced it w a square of gasket material
cut to fit
cut to fit
Tippie
Hero member
- Location
- Dr?bak, Norway
For a while here we were forced to use a type of foam called Explosisafe (some was foam, some was metal mesh) which was supposed to stop the fuel tank exploding every time someone crashed, in a way that nobody had ever seen happen. Some beurocrat making rules. The stuff was expensive and we were supposed to fill the tank full of it. There were stories of it deteriorating and destroying fuel systems and hence motors, so I just had a piece I put in just under the filler opening for scrutineering then took it out.
Andy
Hero member
- Location
- Auckland, roughly
Sounds like a politician in a manufacturer’s back pocket…
Exmoor beast
Hero member
- Location
- Minehead,Somerset, ENGLAND OF COURSE
To My monies on the foam being added to the anti slosh rubber coiled up to further prevent slosh, looks like it’s the same width/ depth of rubber bit.