Question about 1981 Yamaha XS 400 Special

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1982- XS400 Runs poor (misses) at high revs in lower gears

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The intake manifolds beteen the carbs an the motor crack they are fiber material ,,when they crack the motor will miss Its sucking air past the carbs replace or epoxy likr I did ,,seal air off no more miss

Posted on Feb 14, 2011

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Posted on Jan 02, 2017

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Feb 19, 2012 | 1982 Yamaha XS 400

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Hi, Hardworkindr for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Yamaha, despair not, for a mere $10 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Hi, Ljonesy440 for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Yamaha, despair not, for a mere $10 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Jul 13, 2010 | 1982 Yamaha XS 400 SE

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Ttr250 hase a misfire at high revs more noticeable in lower gears starts and runs fine other wise ,have replaced plug tried another lead and coil removed carby cleaned and cheched settings all seem...


I would be looking at the coil,plug lead & plug any one or all of these may be breaking down under load it may also be a loose or worn main jet in the carby are you sure your not over revving it in the lower gears that is holding the gear a little bit to long before changing

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when you cleaned the carb, did you remove the jets? Sounds to me like the high speed jet is plugged

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