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TOPIC: 1979 MX175 tank

1979 MX175 tank 04 Aug 2018 08:35 #1

  • yamahahaha
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Can someone who has a 79 MX175 tank measure the distance in between the 2 front pucks on the tank?? I think 80 and 81 used same tank.

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1979 MX175 tank 04 Aug 2018 12:47 #2

  • FrankC
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If you don't get the info here. Here is a 79 mx for sale and i wonder if you could get them to measure.
www.smartcycleguide.com/L50225589

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1979 MX175 tank 04 Aug 2018 15:21 #3

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Nice lookin bike for the money/ Especially where I am
thanks Frank
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1979 MX175 tank 04 Aug 2018 15:31 #4

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The reason I wanted to know the measurement is I ran across a MX175 tank but for some weird reason the pucks do not line up wth the front. It's almost as if someone pulled the tank apart from the front to make it wider. I'm about 99% sure it's the correct tank for the bike. No I don't have a picture sorry

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1979 MX175 tank 04 Aug 2018 15:46 #5

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The MX175 is basically a DT175 without street gear like lights. DT175 tanks were the same (except for color) from 1979-81. 1978 DT175 had a different rear tank mount and shape. It's more "square" and even if you modified the rear mount it would not fit the 79-81 models without the tank hitting the forks. All the MX and DT models got leading axle forks in 1979 which the 79-81 tank is shaped to have the clearance for.

The 1980 DT175 was redesigned to have the oil tank on the right and the (better design) air filter on the left. (1978-79 DT175 had air filter on right and oil tank on left).

All the MX175 from 1979-81 used the 1979-style DT frame design with oil tank on left and air filter on right... MX175 did not get the "upgrade" to the new oil tank and air filter that the DT175 got in 1980.

Probably TMI... Basically all the MX175's are of the 1979 DT175 design without the lights. Important to know because of the changes to other parts like air filter on the DT's in 1980.

Bottom line... a 1979 to 1981 MX175 gas tank is the same (except for paint) as a 1979 to 1981 DT175 (or DT125 for that matter) gas tank. It's the very first year of 1978 you have to watch out for... and a LOT of ebay sellers incorrectly say the 78 tank will fit the later models... or they list the wrong year... most commonly a 1979 model tank is listed as a 1978 due to the date on the steering head.

Here's a 1978 tank from the bottom:



And now a 79-81. Note the narrower space between the rear mount bolts and how the tank is narrower at the front... this is the type used on all monoshock MX175's (leading axle forks) to the best of my knowledge:

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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

1979 MX175 tank 04 Aug 2018 15:52 #6

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thanks Mark is almost as if someone pulled the tank from the front to make it wider but I know that's not possible...is it???/

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1979 MX175 tank 04 Aug 2018 16:12 #7

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I'm not sure what you mean... if you got a tank that has the tunnel "spread open" that can happen real easy if someone tried to use air to pressurize the tank to pop out a dent or something like that...

Pictures always help.

Here's something else that supports your correct statement that the 1979 tank is the same... frame part number is the same on the MX175 from 1979-81 so tank mounts will be the same.

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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

1979 MX175 tank 05 Aug 2018 12:30 #8

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sorry I don't have a picture. I should have taken one when I saw the tank. Everything about the tank says it's the correct one except that the pucks don't line up like they should with the frame. Maybe someone did pop a dent out and in the process pushed out the front bottom where the pucks are ????

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1979 MX175 tank 08 Aug 2018 16:44 #9

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finally have pictures of tank in question
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1979 MX175 tank 08 Aug 2018 17:01 #10

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Yup... the walls of the tank where the pucks go should be parallel.... that tank looks exactly like one that someone pressurized and it "spread".... don't ask me how I know. :Ugh

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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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