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Picture Attachments Fixed? (18 Feb 2023)

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Cracked gas tank repair

  • srsnow
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Cracked gas tank repair was created by srsnow

The tank on my 74 DT125 has a crack in the bottom right below the filler neck, I tried some JB weld for gas tank but it didn't work still leaks. I thought about trying to solder it but worried about gas fumes even if I flush it with water before hand. Anyone had luck fixing a similar crack?
09 Jan 2023 19:00 #1

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Replied by Mauser on topic Cracked gas tank repair

I've soft soldered my RT tank and had no problems so far.
Yamaha RT2 360 ~ Honda XR650R ~ Kawasaki KH400 ~ KZ650B3
10 Jan 2023 06:02 #2

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Replied by Gr8uncleal on topic Cracked gas tank repair

Was that with silver solder, Simon?
10 Jan 2023 09:46 #3

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Replied by Mauser on topic Cracked gas tank repair

No Alan, bog standard solder like for circuit boards etc, it takes very well to clean steel and the tanks thin which helps.
Yamaha RT2 360 ~ Honda XR650R ~ Kawasaki KH400 ~ KZ650B3
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10 Jan 2023 12:31 #4

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Replied by MarkT on topic Cracked gas tank repair

I think I have it sussed... Simon says standard solder not silver solder seals steel seeps.

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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10 Jan 2023 15:38 #5

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Replied by darinm on topic Cracked gas tank repair

I had an AT tank leaking in the rear bottom corner, had someone TIG weld it and it's been great.
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
1986 Yamaha IT200
2013 Yamaha XT250
10 Jan 2023 16:49 #6

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Replied by Gr8uncleal on topic Cracked gas tank repair

"Simon says standard solder not silver solder seals steel seeps."

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10 Jan 2023 23:51 #7

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Replied by YamahaForumUsername on topic Cracked gas tank repair

Aircraftspruce.com sells a tank sealer for you guessed it, airplanes. www.aircraftspruce.com/catalog/appages/g...r.php?clickkey=11739 . Using silver solder plus this stuff will seal anything. Suprised there isnt an infomercial about this stuff.
11 Jan 2023 10:57 #8

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Replied by shyted on topic Cracked gas tank repair

I have a spare 69 DT 1 tank that needs repair so i'm going to try TIG with16th silicon bronze rods.
Only because there's a split on the top welded joint where it's cut away for the head stock and it needs building up a bit and reprofiling.
I think solders a good idea as very little heats required.
11 Jan 2023 16:18 #9

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Replied by Pedalcrazy on topic Cracked gas tank repair

I’ve had a couple DT tanks repaired by the local welding shop. I figured they would braze it but he said TIG would be perfect for it. That process is very precise and not destructive. I’ve MIG welded a little on seams too which worked great. I think a problem with the repair technique is if it leaks because of rust. Super thin metal is the enemy for sure.
1978 DT400E
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12 Jan 2023 15:06 #10

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