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GS250T Carb Question

  • Thread starter Thread starter dmoore
  • Start date Start date
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dmoore

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Greetings All. I'm new to the forum and already have been helped on other issues for which I am thankful. I have a question about the pilot screw settings for my 1980 GS250T. The manual says these are factory preset and "must not be tampered with." That went out the window somewhere along the ownership line. So I'm curious if anyone knows what the settings should be. I now it's different among bikes. My GS500 is 2 turns out and my CB350 is 1 turn out. I know I could experiment with this but it would be nice to know a ballpark. I have the Mikuni BS30SS carbs. Thanks.

dmoore
 
2.5 is a good starting point. Then tune for the highest idle speed. And be sure to perform a vacuum sync.
 
For what it's worth, while US models are "preset", the Haynes manual has it as 1 1/2 turns for the UK... kind of lean and your bike will need be tip top to run smoothly here, I think.
 
Yes, it will vary from bike to bike, even from carb to carb. The bike will start and run better with a richer mixture than it will with a lean mix, so I usually start at 3 turns out, then lean it for best idle. Most carbs will end up in the 2 1/4 to 2 1/2 range, but if you have that one carb in a hundred that needs to go to 2 3/4, it won't run right if you start at 2 1/2 and you won't know why. You need to adjust each carb. Don't just do the first one then set the second one to match, they might need to be different. When you are done, record those numbers somewhere.

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