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81 Seca XJ750 runs smooth until warm-then low end is rough and misfiring. What do I check first?

Had the carbs rebult twice.

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  • 342 Answers

Something got missed in low speed circuit or incorrect pilot crew seetings, also check for intake leaks rubber carb joints.
its very critical to make sure the low speed circuit and jets are clean thoroughly.

Posted on Oct 28, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Misfire and backfire at low rpm, runs rough at low rpm

You did not say whether or not this was a carburater engine but from the sound of it one of your jets may be sticking, a good cleaning of the jets will most likely fix the problem, the likely cause is a small build up or piece of debris on the jet.

Posted on Jan 02, 2009

DoubleClutch
  • 376 Answers

SOURCE: 1981 Yamaha XJ750 Seca Trouble Starting it

Battery conections need to be checked even the ground wire.

Posted on Oct 01, 2009

  • 132 Answers

SOURCE: zxr750 h1 rough on idle when cold almost misfiring

have you balanced the carbs as if they are out of sync it will run rough

Posted on May 27, 2009

ollie reece
  • 1167 Answers

SOURCE: ktm sxf 450 08, misfire at 3/4 revs and above,

ok buddy on carb will be a screw try fiddle with this mixture screw on carb below get back to me with results 797ccb7.jpg

Posted on Oct 11, 2009

edwar355
  • 71 Answers

SOURCE: 02 Yamaha xvs 650 dragstar classic that misfires when it warms up

First I would change all the spark plugs, and if that didn't make a difference then it sounds like the coil(s) are warming up and breaking down........when it starts to skip take a good pair of pliers with good rubber on them and pull each spark plug wire, when you get to the one that the running doesn't change then I would replace that particular coil

Posted on Feb 17, 2010

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1 Answer

My 94 grand Cherokee jeep runs smoothly until it warms up then runs rough and the security light comes on


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1982 maxim 650 idles rough


Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
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3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yamaha XJ650 Idle Problem
1994 xj600 seca 2 rough idle
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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