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Discussion Starter #1
Hey out there
Not sure if this has come up before but I have a real issue with heat coming up through the tank on a long ride of my 2000 F4S.I live in the NT of AUS and its about 33 degrees c most days.Went for about a 2 hour ride and by the time I got home I couldn't put the inside of my thighs against the tank and they were red and burning by the time I got home,The bike wasn't running hot and no other issues showed themselves,I have experienced this before and am wondering If I am missing some heat shielding somewhere or is it a case of harden up and get off the seat which wouldn't be a problem if we had a few more corners.The tank feels like its close to boiling and is a bit of a worry.

jez
 

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Jezza, there's no heat shield protection under the tank, things get pretty hot under there and you'd probably not want to wear shorts on a long ride. You can take the tank of and apply some gold or silver heat shield to help keep the temps down.
 

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Discussion Starter #5
Thanks Donsy
I was doin a bit of low speed riding trying to get out of the city but once its hot it stays hot,
jez
 

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Hey Mate
Are you or have you had the same issues or is it too cold over there ?
The hottest day I have ridden in the UK was at 29C. Never had a hot tank before, not even when she went over a 100C in the city before the manual fan switch was fitted.
When your inside thighs got red and sore were you wearing full leathers or shorts? I have never ridden without wearing full kit. But if my tank was as hot as you say, then I would still have felt it through my leathers, even if it was just the discomfort. You hav'n't been using some odd fuel? The fuel I use has no ethanol in it. Silly question probably(so don't take the piss please), but do you have any fuel leaks? Could any fuel from a leak cause any heating of the tank through the fuel landing on any hot components? I would presume you would smell it if you did? I am also presuming it is possible to have a leak without it causing a fire?
 

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I've experienced localized fuel boiling inside my tank after I'd finished riding on a very hot day, but only once. The tank itself wasn't hot enough to feel through my jeans, and I run tank pads on the sides.
 

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You F4 riders need to wear long pants. :stickpoke. :naughty:
 

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Discussion Starter #9
Hey Team
No leathers ,never ever ever ever shorts and always Kevlar jeans,no fuel leaks or special fuel ,from the sounds of it I am dealing with good old territory heat,will take your advice Donsy and see if I can get some heat shielding from supercheap or repco for the underside of the tank.

Jez.
 

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I experience about the same every summer in Florida. Get caught at a few stop lights and fuel is boiling when I get home. The only solution I've found is to get out early and try to make it back home before it gets too hot outside.
 

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The best is to fill her up after a long ride. That cold gas sucks a lot of heat out of your legs...

Otherwise, yeah, lot of heat in that area. ITs like a blast furnace coming out of those vents. I tried to wear mesh pants with shorts under them ONCE hoping it would make it cooler, it had the opposite effect, it just made it easier for the heat to get to my legs.
 

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The best is to fill her up after a long ride. That cold gas sucks a lot of heat out of your legs...

Otherwise, yeah, lot of heat in that area. ITs like a blast furnace coming out of those vents. I tried to wear mesh pants with shorts under them ONCE hoping it would make it cooler, it had the opposite effect, it just made it easier for the heat to get to my legs.
I was going to say the lower the fuel level the more heat you will feel.
 

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I've noticed this on hot days and long rides, particularly when getting close to home in traffic and the bike starts running warmer. It could also be a function of the volume of fuel being returned to the tank, slowly raising the temp in there as the fuel bleeds heat out of the intake side of the head.
Ferrari saw this as a potential problem on the Testarossa and routed the AC line from the evaporator to the compressor through one of the dual tanks to cool the fuel. I don't think we can avail ourselves of that solution.
 

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I was going to say the lower the fuel level the more heat you will feel.
The liquid is a heat sink for sure. If its full it takes longer to heat up but once its hot it takes longer to cool down too. But full is best because then it doesnt evap, expand and go into the overflow tubes.

Ferrari saw this as a potential problem on the Testarossa and routed the AC line from the evaporator to the compressor through one of the dual tanks to cool the fuel. I don't think we can avail ourselves of that solution.
Ive just come around to the narrative that its about being air-cooled. Its a fully fared (and moreso than most) bike that makes an incredible HP/liter. Its just gonna get hot, only so much you can do about it. Just gotta keep it moving. Ive never had a problem when moving, its when I get caught in traffic that does it, so I only ride the MV when I can truly enjoy it anymore and take the Griso everywhere else (low HP, oil cooler, naked).

Probably the best you can do is those Shark farings that have the huge cutout the directs air from the radiator and headers. That is the issue, those are hot-boxing. But then you mess up the lines of the bike (subjective).
 
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