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Makotosun

carb issues

  • Dogboy
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carb issues was created by Dogboy

My DT175B runs rich, I have found that when I remove the pilot air screw it no longer runs as rich.  I have down sized the pilot jet from a #25 to a #20 and with this smaller jet in and the pilot air screw out it just barley runs rich.  Basically only at 1/8 throttle.  Does this mean that the idle air circuit is stopped up?  Or is there another circuit possibly restricted?  Or does it even matter knowing the carb needs cleaned
01 Jun 2026 11:12 #1

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Replied by MarkT on topic carb issues

Jet setter o-ring leaking or missing.  (seals to float bowl).   Part #3

www.partzilla.com/catalog/yamaha/motorcy...75/dt175b/carburetor
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
The following user(s) Liked this Post: DVM
01 Jun 2026 12:29 #2

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  • Dogboy
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Replied by Dogboy on topic carb issues

So I checked jet setter O-ring and it is fine. I then cleaned the carburetor again. This time I soaked it for 40 hrs., rinsed thoroughly and this time blew out all of the air circuits in the carb with carb cleaner and compressed air now that I have an air tank. When I put it back together and tested it it is now running properly no longer running rich. Evidently the pilot air circuit was partially/totally restricted.
The following user(s) Liked this Post: MarkT, Snglsmkr, Ht1kid
03 Jun 2026 10:21 #3

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Replied by Gr8uncleal on topic carb issues

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03 Jun 2026 10:47 #4

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