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Makotosun
carb issues
- Dogboy
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Replied by Dogboy on topic carb issues
Plugs are at .22, clip is raised up 1 position, air jet screw is 3.5 turns out and idle jet is a 20, down from a 25. and i will try to get another audio. probably 2.
01 Jul 2026 14:07
#21
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- Dogboy
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Replied by Dogboy on topic carb issues
01 Jul 2026 14:44
#22
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- RT325
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Replied by RT325 on topic carb issues
If it's running well then that's the main thing but often having to go lean on the pilot jet & air screw can point to a very worn needle jet & needle combo, so it's trying to draw fuel up there at idle when should only be the pilot. That wear/ware causes rich running up where the needle does its main job too. Don't panic, if she's running well.
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- MarkT
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Replied by MarkT on topic carb issues
I'd put the jetting back to stock.
Sounds good in last video. When a bike gets "loaded up", you need to ride it. It's not something you can tune to fix or clear up by running the engine in the driveway. And it's possible to foul several plugs in a row until you ride it enough to clear it out.
I learned that from experience. Chased my tail for over a week once years ago. Finally just put a new plug in it and rode the darn thing.
Sounds good in last video. When a bike gets "loaded up", you need to ride it. It's not something you can tune to fix or clear up by running the engine in the driveway. And it's possible to foul several plugs in a row until you ride it enough to clear it out.
I learned that from experience. Chased my tail for over a week once years ago. Finally just put a new plug in it and rode the darn thing.
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: Ht1kid
01 Jul 2026 17:25
#24
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- Dogboy
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Replied by Dogboy on topic carb issues
thank you very much guys.
MarkT - when you back to stock do you mean pilot jet and needle clip or just one of them? Idle screw must be out that far to get it to idle reliably.
MarkT - when you back to stock do you mean pilot jet and needle clip or just one of them? Idle screw must be out that far to get it to idle reliably.
01 Jul 2026 17:29
#25
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- SKYDANCER46
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Replied by SKYDANCER46 on topic carb issues
You can also remove the head & cylinder and get all the excess oil and gas out of the crank area if necessary. I had to do that on 2 of the 4 bikes i just bought a few months ago. They were loaded. One was full of gas. Glad i never tried to start it first. I take the cylinders off on every bike i buy and check for this.
As Mark said i would also put all the jetting and carb settings back to stock and leave it alone. 3 1/2 turns out on the air screw is Way way to much.
As Mark said i would also put all the jetting and carb settings back to stock and leave it alone. 3 1/2 turns out on the air screw is Way way to much.
1968 DT1 250, 1969 AT1 125, 1969 CT1 175, 1970 RT1 360
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01 Jul 2026 17:35
#26
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