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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 18 Mar 2013
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90 xt 600 idle question

My bike runs great, but the problem is the idle goes up alittle. However when I hit the throttle the idle goes down. Now I checked the cables and she returns back good. I rebuilt carbs and instslled new intakes and orings cause they were bad .Any hep would be appreciated thanks again
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  #2  
Old 21 Mar 2013
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No responce yet
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  #3  
Old 21 Mar 2013
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Sounds like your cable is too tightly adjusted, there should be one or two mm free play before the engine speed rises,loosen the adjuster under the tank to give it more free play....maybe this will solve the problem....
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Old 21 Mar 2013
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After you have checked the cables I think you need to check the mixture.

If the pilot screw was adjusted while the bad "intakes" were on you will probably now be running very rich. (I know running lean on mine has the opposite effect to what you are getting).

Warm it up and turn the pilot screw in 1/4 to 1/2 a turn. If the tickover increases you are running rich. If it decreases you are running lean and need to turn it out instead.

Keep adjusting it until you get maximum tickover. (Take care not to turn it out too far - at about 7 turns out it will drop out).

I think stock should be 2 to 2 1/2 turns out.
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  #5  
Old 21 Mar 2013
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The throttle hits the cm stop when she returns. Maybe I will try to play with it again. No w I took off the carb and manifold rebuilt everything then I djusted everything thanks agin
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  #6  
Old 6 Apr 2013
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Which way to turn the pilot in or out? The bike seems to run great . Just a pain in the butt that I have to give it a quick hit on the throttle to bring it down. The idle goes up about like 500 to 700 rpms I did check the slack in the cable and the cam where the throttle is and she is not hanging up I still need your help thanks again. If I take the carb off again is there anyhing that I should be looking for?
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  #7  
Old 6 Apr 2013
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The pilot jet is an air jet on the XT. So screwing in makes the mixture lean and screwing out makes it rich.

2.5 turns out seems to be about right if everything else is OK.

If you are taking the carbs off it might be worth checking the current setting before you change anything. If you are 5 turns out A) you know something isn't right and B) you know where you are staring from.

Turning it all the way to the stop and counting as you go is a monumental pain with the carbs in place and the risk of loosing count is major.

Alternatively you can do it with the carbs in place and not knowing where you are starting from. With the engine warmed up turn it in half a turn. If the tickover picks up you are heading in the right direction. Keep going until the tickover starts slowing back down. Then back of 1/4 to 1/2 a turn.

If the tickover slowed down when you turned it in then turn it out instead.

Go in 1/4 or 1/2 turn steps and keep track so you can set it back to where you started if it doesn't work.

Good luck - and don't burn yourself on the hot engine.

Edit - not sure of my logic in the first sentence but the direction is right. In for lean and out for rich.
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Old 7 Apr 2013
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Thanks for the quick reply. So basically I just turn in the pilot screw in or out until the idle changes, then set in the middle between the high idle and the low idle. Also thanks again for warning me not to burn myself because it is kind of tight there
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  #9  
Old 7 Apr 2013
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Sorry if I confused you... You need to set it at maximum revs.

(The tickover gets dragged down by being either too rich or too lean - maximum revs is where it is right).
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  #10  
Old 7 Apr 2013
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Be sure to set the idlespeed lowish for the test, if its set too high you wont notice any differences.
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  #11  
Old 7 Apr 2013
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I just also noticed that the hose from the air cleaner to the motor is kinked pretty bad I was wondering would that have anything to do with the high idle too thanks
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Old 7 Apr 2013
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no dont thinks so....I thinks its just a breather from the engine ....
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  #13  
Old 12 Apr 2013
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I amsorry tickover means what thanks
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  #14  
Old 12 Apr 2013
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Tickover = idle. Sorry.
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