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What is this foam thing designed to do?

  • msavitt
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dt1e
#34 in pic
block sound or something more important?
 
21 Nov 2022 19:25 #1

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Replied by msavitt on topic What is this foam thing designed to do?

cannot attach so here’s link to dt1e foam #34  

images.cmsnl.com/img/partslists/yamaha-d...yau1075d-12_7261.gif

 
21 Nov 2022 19:27 #2

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Replied by Mark350 on topic What is this foam thing designed to do?

Not DT1 but my RT-1B bought new had that foam pad. Had an electrical issue just after purchase. When the service tech removed the tank that pad was there. I asked what it was for? He said he didn't know for sure but knowing the Japanese they didn't put it there just for fun. I surmise it is for additional support for the tank and mainly to protect the cables and wiring from chafing .
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21 Nov 2022 19:42 #3

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Replied by AirborneSilva on topic What is this foam thing designed to do?

My DT2 has it as well, thought it was something a PO put on but then saw someone else with a DT2 had the same thing so I left it.
1976 DT400C
1981 DT175H
1972 DT2 250
22 Nov 2022 02:35 #4

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Replied by Gr8uncleal on topic What is this foam thing designed to do?

It is shown on some parts lists.
22 Nov 2022 05:13 #5

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Replied by msavitt on topic What is this foam thing designed to do?

Thanks all
i never had one
i noticed that when I close up my man spread that the noise coming from under the tank goes down.  Tank rides on three solid rubber points so I thought it was probably for noise but maybe to reduce tank vibes when low on fuel and perhaps metal fatigue?   Hate to pop a leak 
22 Nov 2022 07:52 #6

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Replied by Pedalcrazy on topic What is this foam thing designed to do?

My early bikes have it, including both 68 DT1 bikes. I think Yamaha calls it a “seal” and I noticed the magneto harness plugs into the bike wiring there. So, I surmised it is to help seal those connections against water. That’s my rationale anyway.
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (Project)
22 Nov 2022 14:37 #7

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Replied by msavitt on topic What is this foam thing designed to do?

yea they call it a seal, that perplexed my walnut sized brain
water angle makes sense pedalcrazy
22 Nov 2022 17:21 #8

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Replied by MarkT on topic What is this foam thing designed to do?

The foam used seems to hold water?

Anyway, I always thought it was there to help support tank and dampen vibration.

I've seen one tank that cracked at rear mount and leaked and that one did not have the foam underneath. I know of others that cracked at rear mount but I don't know if they had foam or not.

Maybe others can share experiences.
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
22 Nov 2022 17:36 #9

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Replied by Lizeec on topic What is this foam thing designed to do?

I have owned and worked on many 1975-1976 MX400’s & YZ400’s and they have the usual front rubber mounting pucks and an additional two more rubber puck isolators mid tank and the rear mounting bracket point stud with a grommet secured by a washer, lock washer and nut, every one I have ever seen the rear bracket is cracked or completely cracked off, granted these particular models were designed to be raced for strictly off road use, they could have probably benefited with some type of foam support, granted these bikes were designed to be replaced after every race season and not still be around 40-50 years later.
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Last edit: 22 Nov 2022 17:59 by Lizeec.
22 Nov 2022 17:56 #10

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