Cracked titanium gas tank 2018 crf 250f & 450f

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12/19/2019 3:57 PM

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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12/19/2019 4:04 PM

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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Current rides: 2020 CRF450RWE and 2019 TC300
Occasional ride for VMX: 1985 CR500RF
Adventure/Road bike: CRF1000L

12/19/2019 4:11 PM

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 ...more

Me either I’ve asked just about anyone on a honda and everyone has the same response haha

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12/19/2019 4:12 PM

How much do you weigh?

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12/19/2019 4:25 PM

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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12/19/2019 4:27 PM

Dear Ty...

I think a plastic tank would be good for you!

laughing

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Out here in the fields, I fight for my meals. I get my back into my living. I don't need to fight, to prove I'm right. I don't need to be forgiven.

12/19/2019 4:42 PM

slowgti wrote:

How much do you weigh?

150lbs

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12/19/2019 4:45 PM

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

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12/19/2019 7:07 PM

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

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There's something happening here, what it is ain't exactly clear.

12/19/2019 7:54 PM

106 hours on mine, no cracks or dents that I know of. Guess I’ll watch out after reading this.

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12/19/2019 9:35 PM

Sounds like ty is too fast for Ti

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12/19/2019 9:52 PM
Edited Date/Time: 12/19/2019 9:53 PM

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 Photo

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12/21/2019 2:06 PM

I have never heard of this, and i seem to find everything thats breakable

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12/22/2019 9:08 AM

A pic of the tank and crack would be helpful.

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12/22/2019 9:25 AM

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.

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12/22/2019 10:18 AM

Apparently Ty is stronger than Ti.

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12/22/2019 10:23 AM

I know a person that can replicate the stock tank from fiberglass . Turn around is quick, shipping to and from Indonesia isnt

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12/23/2019 7:48 AM

Pictures would be great. The last I checked there was no such thing as a CRF450f.

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Oldmxer95

2021 FX350, 1995 KDX200H, 1998 KX300K5, 1984 KX125C

12/23/2019 8:33 AM

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 ...more

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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12/23/2019 12:35 PM

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 ...more

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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Current rides: 2020 CRF450RWE and 2019 TC300
Occasional ride for VMX: 1985 CR500RF
Adventure/Road bike: CRF1000L

12/23/2019 12:53 PM

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 ...more

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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1/15/2020 12:14 PM

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.
Photo
Photo

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1/15/2020 12:40 PM

TIG weld it.

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1/15/2020 12:49 PM

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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1/15/2020 12:50 PM

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.

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1/15/2020 1:39 PM

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 ...more

I'd say yes, but I bet its because of the metal work hardening (strain hardening or cold working) and then cracking.

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2018 KTM 250sx
Instagram CamaroAJ

1/15/2020 1:47 PM

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.

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1/16/2020 8:01 AM

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

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1/16/2020 8:21 AM
Edited Date/Time: 1/16/2020 8:23 AM

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.

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Out here in the fields, I fight for my meals. I get my back into my living. I don't need to fight, to prove I'm right. I don't need to be forgiven.

1/16/2020 12:03 PM

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

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Current rides: 2020 CRF450RWE and 2019 TC300
Occasional ride for VMX: 1985 CR500RF
Adventure/Road bike: CRF1000L