Posted September 5, 200618 yr i have a problem with my xs 400 se, it starts first time but wont rev over 1000rpm for a period of time and then all of a sudden it fires into life. its had new points fitted the timing set up carbs cleaned and balanced and a full service but still has this problem can anybody help please. Edited September 5, 200618 yr by scooby
September 5, 200618 yr Scooby, I just recently rebuilt my the carbs on my XS400 with a lot of help from Yamahead. I'm not a pro, but from my recent experience I'd look at the slides and see if they are sticking. They need a little lubrication to make sure that they move freely. If they don't slide...it won't rev. How does it react when you open the choke? BrewTrooper
September 7, 200618 yr Oh yeah, You also need to make sure that the slide needel CV Boot tabs are lined up with the index mark on in the chamber and that they are sealed well. They are raised via a vacuum so they need to be seated properly. Ken
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