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XTZ660 jet needle clip adjustment? XTZ660 jet needle clip adjustment?
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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 7 Apr 2009
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XTZ660 jet needle clip adjustment?
Hello, On an XTZ660's Dual carby's do you adjust the jet needle clip for rich or lean mixture on the primary carb or secondary carb?

I have an aftermarket pipe and air filter fitted and am finding it a bit lean, i have read allot about adjusting the jet needle clip for tuning...... but what i have read have been for single carbs, so I am not sure which to adjust on the dual TEIKEI carbs on my bike.

Thanks for your help
Brad
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  #2  
Old 7 Apr 2009
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Mt guess is that you should ricjen it up on both carbs.

If you richen the primary and thats spot on, then the bike will probably lean it out when the secondary carb kicks in.

I'll be rejetting my xt600 in a couple of weeks and get a dynorun on it. I can post results here if you'd like?
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  #3  
Old 8 Apr 2009
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Quote:
Originally Posted by Jens Eskildsen View Post
Mt guess is that you should ricjen it up on both carbs.

If you richen the primary and thats spot on, then the bike will probably lean it out when the secondary carb kicks in.

I'll be rejetting my xt600 in a couple of weeks and get a dynorun on it. I can post results here if you'd like?
Yeah thats a good point actually.

The results of your Dyno would be great to know, thanks.
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  #4  
Old 19 Apr 2009
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My project has been delayed. The new headers are in backorder from kedo.de and will remian so for around 4 weeks

How did you're project go?
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  #5  
Old 2 May 2009
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Hey, I've got my downpipes, mounted them, and opened out the airbox.

I'll be fixing the carb tomorrow.

I't runs fine without any mod, but my guess its that it euns to lean, with the opened airbox, bigger downpipes and an pretty open exhaust (laser pro duro)

I think i'll raise both needles one noth, and then get it on the dyno, to see what needs further adjustment (perhaps bigger jets)
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  #6  
Old 21 May 2009
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Yhe plug was white with all the new stuff, so I've raised both needles, and have just added 140/130 jets (130/120 stock)

I'll get it on a dyno on wednesday

How 'bout yours?
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  #7  
Old 28 May 2009
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Hi

I was thinking about getting a dynojet kit for my xtz. Just curious to here about your results with bigger jets and lifting the needles, before I let my hard earned cash go to dyno..
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Old 28 May 2009
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No results yet for me, the tube broke just before the dyno run

I got a new one now, and i'm planing on a dynorun tuesday/wednesday.
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  #9  
Old 29 May 2009
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damn thats a bummer jens i'd like to see dyno results on the open air box and pro duro setup.
have you still got the baffle in the link pipe on the pro duro system?
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  #10  
Old 29 May 2009
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Hey, I dont know what a "baffle" is, can this pic help?



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  #11  
Old 30 May 2009
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the pro duro has a little mesh spark arrestor welded in the tip of the tail pipe which is quite easy to remove and makes a bit of difference to the sound of the exhaust.
there is also a mesh tube in the link pipe the can fits onto which is there to quieten it down too.
i've taken both out of mine
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  #12  
Old 31 May 2009
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Oh yeah sure, it's all gone

Ill post my dynorun, however the poor it might be.

I've got the old dynorun laying around somewhere, I'll post that as well
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  #13  
Old 10 Jun 2009
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Back again.

My mods:

Kedo bigger downpipes.
Laser produro exhaust.
Opened airbox.
pipercross foamfilter

-----------------

Stock jets: 130/120
My jets: 140/130

Needles stock: 3. position (in the middle)
My needles: 2. from the top (needles one noth up, to richen it up)

The test showed that it was lean in the lover area, so I need a bigger idle jet. (no. 48, 46 is stock)

The middle area (needle) were perfect.

The top was rich, so i need smaller jets. Im guessing something in the middle of stock and my current onces. Around 135/125.

Hope you can use it.
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  #14  
Old 10 Jun 2009
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Hi

Thank you for the info. Guess i´ll try something similar on my xtz. Will post when done.

Chris
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  #15  
Old 11 Jun 2009
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AFAIK the xtz is pretty rich with stock jetting.

kedo.de sells a set to get more MPG, with ( i think) smaller jets and another needle.
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