Cracked titanium gas tank 2018 crf 250f & 450f

Ty_Davis118
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Ty_Davis118
Edited Date/Time 1/17/2020 12:38pm
Anyone else out there crack their gas tank right where the seat meets up to the tank? I’ve cracked 2 different tanks now, same exact spot on my 450 & 250. One had all the bolts and rubber mounts in. The other I was told to take the back two tank bolts out so it wasn’t so rigid. I took the those out and kept the rubber mounts on and shaved the two plastic slots on the seat that sit on the tank to be flush with the tank and taped and padded them so the slap wouldn’t be as hard and it’s still cracked. I don’t know what else to try!! I’ve taken them to titanium welder & welded both of them 4 times and still keep crackin’.
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kiwifan
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kiwifan 12/19/2019 4:04pm
12/19/2019 4:04pm
Never happened to me, haven't seen it happen to others (not saying there isn't a problem, just never seen it or heard of it until now)
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Ty_Davis118
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Ty_Davis118 12/19/2019 4:11pm
12/19/2019 4:11pm
kiwifan wrote:
Never happened to me, haven't seen it happen to others (not saying there isn't a problem, just never seen it or heard of it until now)
Me either I’ve asked just about anyone on a honda and everyone has the same response haha
slowgti
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slowgti 12/19/2019 4:12pm
12/19/2019 4:12pm
How much do you weigh?
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stillwelding
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stillwelding 12/19/2019 4:25pm
12/19/2019 4:25pm
A stress relief treatment is sometimes employed following severe forming or welding to avoid cracking or distortion due to high residual stresses, or to improve fatigue resistance. ... Most titanium grades are typically stress-relieved at about 1000°F (538°C) for 45 minutes and annealed at 1300°F (704°C) for two hours.
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TeamGreen
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TeamGreen 12/19/2019 4:27pm
12/19/2019 4:27pm
Dear Ty...

I think a plastic tank would be good for you!

Laughing
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Ty_Davis118
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Ty_Davis118 12/19/2019 4:42pm
12/19/2019 4:42pm
slowgti wrote:
How much do you weigh?
150lbs
Ty_Davis118
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Ty_Davis118 12/19/2019 4:45pm
12/19/2019 4:45pm
TeamGreen wrote:
Dear Ty...

I think a plastic tank would be good for you!

Laughing
They only make off-road plastic tanks! At least from what I could find
ledger
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ledger 12/19/2019 7:07pm
12/19/2019 7:07pm
TeamGreen wrote:
Dear Ty...

I think a plastic tank would be good for you!

Laughing
Ty_Davis118 wrote:
They only make off-road plastic tanks! At least from what I could find
TG could make a carbon fiber tank for you and let you test it for at least two year's...Cool
vitalriderCrf
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vitalriderCrf 12/19/2019 7:54pm
12/19/2019 7:54pm
106 hours on mine, no cracks or dents that I know of. Guess I’ll watch out after reading this.
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fins227
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fins227 12/19/2019 9:35pm
12/19/2019 9:35pm
Sounds like ty is too fast for Ti
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Lukass59
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Lukass59 12/19/2019 9:52pm
12/19/2019 9:52pm Edited Date/Time 12/19/2019 9:53pm
TeamGreen wrote:
Dear Ty...

I think a plastic tank would be good for you!

Laughing
Ty_Davis118 wrote:
They only make off-road plastic tanks! At least from what I could find
I have one of these on my crf450. Holds slightly more fuel than stock, but not by much. Company said it’s the same ergonomics as the stock tank
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Lastander
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Lastander 12/21/2019 2:06pm
12/21/2019 2:06pm
I have never heard of this, and i seem to find everything thats breakable
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Jeremy Macbeth 12/22/2019 9:08am
12/22/2019 9:08am
A pic of the tank and crack would be helpful.
Timo_2824
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Timo_2824 12/22/2019 9:25am
12/22/2019 9:25am
Never understood why people got excited about metal gas tanks returning to bikes. My first 2 bikes were 1970's models with metal tanks. Pinholes, dents, corrosion... Plastic tanks are awesome.
3
MaxPower
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MaxPower 12/22/2019 10:23am
12/22/2019 10:23am
I know a person that can replicate the stock tank from fiberglass . Turn around is quick, shipping to and from Indonesia isnt
Oldmxer95
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Oldmxer95 12/23/2019 7:48am
12/23/2019 7:48am
Pictures would be great. The last I checked there was no such thing as a CRF450f.
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motosmoke
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motosmoke 12/23/2019 8:33am
12/23/2019 8:33am
kiwifan wrote:
Never happened to me, haven't seen it happen to others (not saying there isn't a problem, just never seen it or heard of it until now)
So you got Ti tanks as well huh.

How come you never post pictures of all 25 trick bikes you have?
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kiwifan
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kiwifan 12/23/2019 12:35pm
12/23/2019 12:35pm
kiwifan wrote:
Never happened to me, haven't seen it happen to others (not saying there isn't a problem, just never seen it or heard of it until now)
motosmoke wrote:
So you got Ti tanks as well huh.

How come you never post pictures of all 25 trick bikes you have?
Piss off dude !!!!!
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motosmoke
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motosmoke 12/23/2019 12:53pm
12/23/2019 12:53pm
kiwifan wrote:
Never happened to me, haven't seen it happen to others (not saying there isn't a problem, just never seen it or heard of it until now)
motosmoke wrote:
So you got Ti tanks as well huh.

How come you never post pictures of all 25 trick bikes you have?
kiwifan wrote:
Piss off dude !!!!!
Can you post a pic of the Ti tank on your bike?

Just wanna see if the fits good...
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Jfanc22
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Jfanc22 1/15/2020 12:14pm
1/15/2020 12:14pm
Finally! I have found someone with the same issue as me. I have craked 4 ti gas tanks on my 2019 Crf 450r works edition. Honda understands that it is an issue, and it is mostly an issue for there "elite riders" from what honda has told us. They have warrantied us the past 3 tanks but I'm on the verge of cracking my 5th tank in the exact same spot. Now honda is telling us they are done helping, $800 a tank is a lot of $$$. Have you found any solutions?
I have also removed the back two gas tank bolts whileeee also Purchasing ti- motor mounts (which helps with the felx of the motorcycle) but still tanks are still cracking.


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MOTO1313
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MOTO1313 1/15/2020 12:40pm
1/15/2020 12:40pm
TIG weld it.
tzmike
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tzmike 1/15/2020 12:49pm
1/15/2020 12:49pm
Cast iron like a engine block, the welder drills one hole in front of the crack and another at the end of the crack to stop further damage. That may be helpful. As well as building up the area with more material. If removing material from the seat is needed that's easy. Could tank mounting points be a issue ?
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SmokinJoe439
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SmokinJoe439 1/15/2020 12:50pm
1/15/2020 12:50pm
This reminds me of the Ti subframes Yamaha sold under the gytr in the late 90's early 2000's. They were prone to cracking as well. I wonder if they are flexing and it's causing them to crack over time.
AJ565
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AJ565 1/15/2020 1:39pm
1/15/2020 1:39pm
SmokinJoe439 wrote:
This reminds me of the Ti subframes Yamaha sold under the gytr in the late 90's early 2000's. They were prone to cracking as well. I...
This reminds me of the Ti subframes Yamaha sold under the gytr in the late 90's early 2000's. They were prone to cracking as well. I wonder if they are flexing and it's causing them to crack over time.
I'd say yes, but I bet its because of the metal work hardening (strain hardening or cold working) and then cracking.
Supermega1
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Supermega1 1/15/2020 1:47pm
1/15/2020 1:47pm
Seems like the two most common reason that Ti cracks according to my Google-Fu is cracks caused by corrosion or Sustained Load Cracking.

I'd guess there is something putting pressure on that spot when your riding that is causing it. Maybe riding closer to the front of the bike higher up on the tank is causing extra pressure on that one spot.

You can see three wear marks to the right and up of the crack. Pressure on that area might be causing a "blow out" where the crack is.
Spudnut
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Spudnut 1/16/2020 8:01am
1/16/2020 8:01am
motosmoke wrote:
So you got Ti tanks as well huh.

How come you never post pictures of all 25 trick bikes you have?
kiwifan wrote:
Piss off dude !!!!!
motosmoke wrote:
Can you post a pic of the Ti tank on your bike?

Just wanna see if the fits good...
His dealer won’t allow it... too trick
1
TeamGreen
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TeamGreen 1/16/2020 8:21am
1/16/2020 8:21am Edited Date/Time 1/16/2020 8:23am
Take the bolt out of the back mount of the tank and see how it does (many people do this saying that it makes the bike feel less stiff). Some of the factory bikes have the tank mounted with a rubber strap...I believe that's how the RX tank mounts.
kiwifan
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kiwifan 1/16/2020 12:03pm
1/16/2020 12:03pm
kiwifan wrote:
Piss off dude !!!!!
motosmoke wrote:
Can you post a pic of the Ti tank on your bike?

Just wanna see if the fits good...
Spudnut wrote:
His dealer won’t allow it... too trick
Nice troll, I hope you feel better about yourself posting that
2
Timo_2824
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Timo_2824 1/16/2020 2:51pm
1/16/2020 2:51pm
Plastic tanks are the way of the future...

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