How to mount my tank

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Aaugman

Well-Known Member
Messages
135
So the tank I have on my bike is a demons replica of the Yaffee tank, I solid mounted the tank and bad a crack develop on the rear mount, so now I have to redo it. What would you guys recommend ? Cut those tabs off and weld on new rubber mount ? Have vertical rubber mounts front and back or just front and have a horizontal (stock) rear rubber mount ? I dont want to have to redo it this again...
 

smokenjoep01

Well-Known Member
Messages
1,257
Location
CapeFear NC
Most those knock off tanks leak around were the mounts are welded. Thats the difference between a knock off and the real thing. Most likely your best off cutting the bracket off and have it tig welded on by a professional. Should be no reason you would want to rubber mount your tank. Your motor is already isolated from the frame. JMHO
 

shadow

Well-Known Member
Messages
542
Location
arizona
I've got the Demons cycle tank as well,I inspected it pretty good inside an out all seemed to be pretty solid and i don't see any difference between this one and Yaffes tank.I will double check again all welds,Inside coating is done and is ready for paint.Glad to see this thread cause it can never hurt to double check again.
 

shadow

Well-Known Member
Messages
542
Location
arizona
Aaugman do you have any pictures of your tank mounted?Mine is going to be painted this week or next. I know they are real similar to Yaffe just a little bit deeper up front can never hurt to see more pics.Thanks!
 

Aaugman

Well-Known Member
Messages
135
Shadow, I cut mine in half and narrowed it up, I think it cracked because of that, not because of build quality.

Smoken: My bike is a hardtail with a solid mount 110" Evo, Any cons to rubber mounting the tank ?
 

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smokenjoep01

Well-Known Member
Messages
1,257
Location
CapeFear NC
Once you use the sealer inside your done. Have it tig welded and pressure tested.
I have never rubber mounted a tank, ebven on rigid mount/ and suspension. If your bracket is properly welded its going to stay mounted, even with the weight of it full of fuel. Did you pressure test your seam in a water tank when you welded it back together?
 

Aaugman

Well-Known Member
Messages
135
Yes I did have it sealed and pressure tested, It cracked at the rear mount, the weight of the tank and I think a haul down the highway flat out cracked the rear mount above the weld. I think what I'm going to do is cut the messy rear mount off, and have someone tig a new piece on and then mount some new heavier duty mounts. What is the disadvantage of rubber mount ?
 

Bill

I used to own some shit!
Messages
7,115
Location
Omaha NE
Yes I did have it sealed and pressure tested, It cracked at the rear mount, the weight of the tank and I think a haul down the highway flat out cracked the rear mount above the weld. I think what I'm going to do is cut the messy rear mount off, and have someone tig a new piece on and then mount some new heavier duty mounts. What is the disadvantage of rubber mount ?

For one you will introduce movement, which I think would lend to more cracks in the future.
 

Aaugman

Well-Known Member
Messages
135
That what I thought in the beginning which is why I solid mounted it first...agg, this is a PITA !!!
 

Bill

I used to own some shit!
Messages
7,115
Location
Omaha NE
Let's see a pic of this tab.

When welding structural tabs to sheet metal there are a few things you can do to spread the load.
 

Opunui

Well-Known Member
Messages
3,325
Location
Oahu/ East side
My opinion is if there mounted in a three peice design..meaning you have two front mounts and one back make sure the front are rubber mounted with vibration isolation pads then you can solid mount the rear. i would never mount it solid all the way around.
 

Aaugman

Well-Known Member
Messages
135
You can't mount 1 solid and one rubber, that would create even more stress. why do you think the sporty's are rubber mounted ? The sheet metal of the tank is so thin, I think I'm going to tig additional steel to the bottom and then weld a tab onto that. I'll take some pics when I get the chance to work on it.
 

Opunui

Well-Known Member
Messages
3,325
Location
Oahu/ East side
What are you talking about one solid one rubber.the mounts are trianglated for a reason. And what you might think that the tank are rigid mounted there not. There is play in the forward mounts however very slight.rigid mounted with no vibration isolaters causes undo metal fatigue and stress at the weldments.
 

smokenjoep01

Well-Known Member
Messages
1,257
Location
CapeFear NC
For one you will introduce movement, which I think would lend to more cracks in the future.
THIS!
Just make sure the metal your welding to is of the same gauge or thicker than what the thickness is of the bracket. Build it twice as thick as you think it would need to be. Look closely around the area were tabs are welded on to the stock tanks. There layered to increase thickness in those stressed area's. JMHO
 

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