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Carb top gasket

  • hackman101
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Carb top gasket was created by hackman101

It is called the "mixing chamber top" on Partzilla, I have a gasket there that is rather hard. There are other parts like the carb mount and the breather box tube/connector that is at the rear of the carb I am going to treat with wintergreen, along with a few other small parts.

I would like to include this gasket, but I have no idea if it is supposed to be softer or not. For now the gasket is so rigid, if I bent it even a little, I feel as it would snap. Does anybody out there have any insight how flexible or soft this gasket is supposed to be?  I also need to mention, the gasket is not even in the parts diagram. The gasket I have is under part number 27. It is a flat washer/gasket that sets on top of the carb body and the mixing chamber top screws down on top of it.

 
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
Last edit: 23 Nov 2021 20:59 by hackman101. Reason: Fixed typos
23 Nov 2021 20:43 #1

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Replied by MarkT on topic Carb top gasket

Originally it was soft and flexible.
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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24 Nov 2021 06:23 #2

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  • hackman101
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Replied by hackman101 on topic Carb top gasket

Thanks Mark, I will toss it into the stew pot with the other parts.
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
24 Nov 2021 19:06 #3

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Replied by Scootern29 on topic Carb top gasket

What I have done in the past with the old, stiff, cracked gaskets is to make one out of an old inner tube until you can find one. Sudco probably stocks them I would assume.
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24 Nov 2021 19:17 #4

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Replied by MarkT on topic Carb top gasket

Can you measure the outside diameter?  I can see if I can find one.
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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24 Nov 2021 19:40 #5

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Replied by hackman101 on topic Carb top gasket

I just checked the Sudco website, at first glance, its pretty impressive what they have on hand. Their drawing shows the gasket whereas the Yamaha drawing does not. Now just to find which carb I have. I do believe that the info is on this forum someplace.

Took no time to find it it is a VM30SC.This is a great site!!
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
Last edit: 24 Nov 2021 20:05 by hackman101. Reason: Added more info
24 Nov 2021 19:59 #6

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Replied by hackman101 on topic Carb top gasket

It just so happens I have a 40 year old tube that may do the trick, if a proper one does not turn up.
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
25 Nov 2021 14:43 #7

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Replied by hackman101 on topic Carb top gasket

@Mark T, the outer dimension is 40mm or 1-9/16" with a 1/4" width to the inside

 
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
The following user(s) Liked this Post: MarkT
25 Nov 2021 14:47 #8

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Replied by hackman101 on topic Carb top gasket

I also looked over the Sudco website a little closer, they do not sell to the public, only dealers. There are a list of dealers for the NW USA, by the name of some of them, they appear to cater to other carb types.
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
25 Nov 2021 14:50 #9

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Replied by MarkT on topic Carb top gasket

Let me see what I can find. 
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
25 Nov 2021 15:36 #10

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