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Xt600 Misfires, then cuts out... Help Needed Xt600 Misfires, then cuts out... Help Needed
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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 19 Feb 2015
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Just because you've cleaned and tested something doesn't mean you should necessarily cross it off your list.


Any chance of getting another carb off another bike and trying it out ?

Cold engines and hot engines have VERY different fuel/air requirements.

It could be running very rich and at high temperatures, trips it up.

How is the choke and pilot curcuit ?? Do you need choke to start it ??
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Old 19 Feb 2015
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What jet sizes are you using? What altitude are you at? Could be waaaay too rich.THUMPTHUMP
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  #3  
Old 19 Feb 2015
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Quote:
Originally Posted by *Touring Ted* View Post
Just because you've cleaned and tested something doesn't mean you should necessarily cross it off your list.


Any chance of getting another carb off another bike and trying it out ?

Cold engines and hot engines have VERY different fuel/air requirements.

It could be running very rich and at high temperatures, trips it up.

How is the choke and pilot curcuit ?? Do you need choke to start it ??

Hi Ted

It's true!
As it is right now it will start without choke. It did need it before.
The thing is, I havn't been able to adjust the air / fuel screw since I can't get it to idle.

Last time i cleaned out the carb I went through pilot / choke systems with a piece of piano wire and they were 100% clean.

I am thinking that this might be my ignition coil that is going wrong. It is afterall a momentary fault. So I guess I won't be able to measure it....
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Old 19 Feb 2015
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Originally Posted by jonasp View Post
Hi Ted

It's true!
As it is right now it will start without choke. It did need it before.
The thing is, I havn't been able to adjust the air / fuel screw since I can't get it to idle.

Last time i cleaned out the carb I went through pilot / choke systems with a piece of piano wire and they were 100% clean.

I am thinking that this might be my ignition coil that is going wrong. It is afterall a momentary fault. So I guess I won't be able to measure it....

FYI, dragging steel wire through aluminium carbs isn't a great idea. You can do damage and make things worse. However, lets assume you were super careful and everything is okay.

Well, In my experience a big 600cc air-cooled single usually always needs a decent amount of choke to get it going. Even in hot countries. If it starts without any choke in a bleak, cold British winter then I think your jetting is out.

Take it all back to standard book settings with the jet sizes and pilot screw and see how it goes from there.

Do you know what your screw setting and jets are at the moment ??
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Old 19 Feb 2015
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Originally Posted by *Touring Ted* View Post
FYI, dragging steel wire through aluminium carbs isn't a great idea. You can do damage and make things worse. However, lets assume you were super careful and everything is okay.

Well, In my experience a big 600cc air-cooled single usually always needs a decent amount of choke to get it going. Even in hot countries. If it starts without any choke in a bleak, cold British winter then I think your jetting is out.

Take it all back to standard book settings with the jet sizes and pilot screw and see how it goes from there.

Do you know what your screw setting and jets are at the moment ??
I know that steel vs alu or brass is bad. So yes, I was super carefull.
As it is now the jetting is standard.
And the air/fuel screw is 1,5 - 2 turns out. I havn't felt a big difference when turning the A/F screw. But then again, it will not idle long enough to adjust proper.
I have tried turning in and out for 1/4 turns then starting.
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Old 19 Feb 2015
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Hi
it might be worth just taking the end off as on the older xt they quite oftern blicked the silencer up and this would xause the engine to run bur cut out soob after starting skip
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  #7  
Old 19 Feb 2015
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There is a capped off nozzle on the left carb boot between the carb and motor. Take that cap off and see if it clears up. It'll let more air in and if it's running extremely rich there will be a very noticeable difference. I have one carb that is screwy and always ran overly rich, Till I had the time to make smaller jets I had that cap off(put a foam over it to somewhat filter the air). That carb needs several sizes smaller jets than all my other XT carbs. It would puff black though when I twisted the throttle, but idle like crap(had the mixture screw bottomed out even) and top end surged badly but would rev out.

I don't think it's carb related but you never know. I should need a choke to start definitely when properly jetted.
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  #8  
Old 19 Feb 2015
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Jonas has posted the problem last week on my forum, have a READ.

Nothing wrong with posting on here as well Jonas, we post on all forums so more brains will hopefully fix the problem.

I think the clues are when the bike gets to operating temp, electrical components can fail when hot so its leading towards your coils breaking down.

Possibly your trigger coils are giving mixed signals to you CDI?

Mezo.
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