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Makotosun

CT3 pilot jet

  • Dennis D
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CT3 pilot jet was created by Dennis D

Manual says it's suppose to be a 25 and I found a 35 in it when I took it apart.
Anyone have access to a service bulletin about this carb showing any factory
upgrades? Thanks, D
31 Jul 2023 10:14 #1

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Replied by MarkT on topic CT3 pilot jet

It's in the back of the 71-73 100-175 Yamaha combined service manual in the Tech Library. 
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 Jul 2023 10:26 #2

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Replied by Yamfan on topic CT3 pilot jet

Why not try adjusting the air screw, and find out for yourself if the jet is the correct size or not? Ethanol type fuels, will often mean jetting adjustments are required.

If your air screw needs to be more than 2 turns out to provide best running, you might need a smaller jet. If it's 1 turn or less out, you will need to go bigger. Very easy adjustment to make.
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31 Jul 2023 11:07 #3

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Replied by Dennis D on topic CT3 pilot jet

Bike had a chinese carb installed on it when I got it. This is a CT3 carb I am rebuilding to install on the bike. I ordered both jets from Sudco so I can tune it if need be.
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31 Jul 2023 11:48 #4

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