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Makotosun

1975 DT175 timing questions

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Replied by Swoop56 on topic 1975 DT175 timing questions

I think your carb is correct . I just went and checked out DT 175 B carb page on
Rocky Mountain ATV , and the carb part number has a 443 prefix , which is the number stamped
on yours . the diagram shows main jet as a side entry too .
I don't know where you picked up your parts page , but it might be for a different market bike .
So carry on .
31 May 2020 20:03 #121

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Replied by GJVGC on topic 1975 DT175 timing questions

Swoop,

I just noticed the same thing as I went to order the main jet etc.
That photo I posted earlier is from the service manual I downloaded from this forum.
It says dt175 A, b ,c With that diagram under it.
Thanks for the help!
31 May 2020 20:30 #122

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Replied by MarkT on topic 1975 DT175 timing questions

Here is the factory service data sheet:









.
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
31 May 2020 20:38 #123

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Replied by MarkT on topic 1975 DT175 timing questions

Also I found some stock reed petals and stoppers from a 175... and the whole assembly.

Just FYI you can also buy the whole assembly new from Yamaha (Partzilla) for $102. That's probably what I'd do.
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
31 May 2020 20:47 #124

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Replied by Mothersbaugh on topic 1975 DT175 timing questions

I'll add that I started out a few years ago doing these Mikunis, and last summer, I rebuilt a 1997 XT350 carb. Both sides of it. And it fired right up second kick! And ran perfectly. If I can do it, you can do it.
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Last edit: 31 May 2020 21:07 by Mothersbaugh.
31 May 2020 21:04 #125

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Replied by GJVGC on topic 1975 DT175 timing questions



Giving it a shot. Thanks guys
Im putting it back together as it was with a new 160 main jet.

If this doesn’t fix it I will order the reeds from Yamaha.
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01 Jun 2020 07:00 #126

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Replied by Snglsmkr on topic 1975 DT175 timing questions

It may have been removed for the photo.
Was there a soft metal washer/gasket on the main jet banjo bolt?
01 Jun 2020 17:51 #127

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Replied by GJVGC on topic 1975 DT175 timing questions

^ yes there was a rubber gasket on it.
I still have it

Would it be ok to use a copper crush washer?
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01 Jun 2020 18:07 #128

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Replied by Mothersbaugh on topic 1975 DT175 timing questions

#12 here...still available
www.partzilla.com/catalog/yamaha/motorcy...75/dt175b/carburetor
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01 Jun 2020 22:08 #129

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Replied by GJVGC on topic 1975 DT175 timing questions

^thanks, ordered one.
I was able to get everything new oem except the float.


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07 Jun 2020 06:46 #130

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