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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 Mar 2011
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Up to 3000 rpm you are using the primary carb and in part the idle jet. Hence we can say with reasonable certainty the issue isnt in the primary carb. Also this carb is cd-slide. i.e. forced operation
The secondary carb comes into operation at 3000rpm. However it is a venturii and will only come into full operation if the vacuum draw is sufficient. It was designed to assist mid range bog down of the primary. For this carb to come into full operation it really needs to have the throttle open wide consistently. i.e. flat out or when accelerating. Above 5000rpm matches this model hence my earlier supposition tht it is a secondary carb issue.

Have you ensured the emulsion tubes are clear?

Faulty coils that are broken have the reverse symptoms. As the engine gets hot they break down, and they operate better then above 4krpm than below it during these conditions.

However carbon tracking in HT leads will tend to arc out to earth before reaching the electrode (plug) too hence why I didnt discount it.
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Old 9 Mar 2011
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Probs

Hi.
Posted before about a similar prob I had some years back.
Have you checked the valve timing, i.e, I had a customers bike showing similar problems and traced it to one tooth out on one of the camshaft sprockets.
At the very least it would tick it off as I went down the carb route before checking for it.
Hope it helps mate.
Dave.
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  #3  
Old 10 Mar 2011
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Valve timing

I can check that. I'll have to do a bit of reading in the manual first. Something I should check anyway.
I had kind of discounted a timing issue because of the fact that after 10 to 15 mins of riding it would run well. If the timing was out, I didn't think there would be a change in performance. IE it would consistently run poorly and not improve. But, I'm open to anything. I'll get back to you on that.
If it is a carb problem, it's got me stumped, or it's an air leak/fuel blockage that is so small it's difficult to isolate.
Thanks for being fellow head scratchers. I owe you all a .
Cheers, Julian
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  #4  
Old 10 Mar 2011
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Checking valve timing

Do you need to remove the cylinder head cover in order to check the valve timing, or can you do it through the timing holes.
I've got a Clymer manual that I'm really starting to get annoyed with. The explanations are crap at best. CHeers, Julian
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  #5  
Old 10 Mar 2011
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valve cover off ...

Yes, unfortunately. Quite an operation, I'd suggest to first check your other options. In more than 300.000 km of riding XT6's I never had a timing chain jump a tooth ...

If you decide to take the cover off, do not forget the nastily hidden bolt between the upper engine mount. I guess that you do not have to drop the engine, just remove the carburettors and 'rotate' the cover off backwards. This is how it is on the older XT6's.

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  #6  
Old 10 Mar 2011
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Quote:
Originally Posted by aukeboss View Post
Yes, unfortunately. Quite an operation, I'd suggest to first check your other options. In more than 300.000 km of riding XT6's I never had a timing chain jump a tooth ...

Probably because you assembled correctly .... .. but there is no accounting for it's history.
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  #7  
Old 10 Mar 2011
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Cam type stuff.

"In more than 300.000 km of riding XT6's I never had a timing chain jump a tooth ..."

Indeed!
However, this wasn't suggested, jumping cam chains that is.
The bike was bought with this problem and who knows what has been (or not) done?
I have seen it before, as in my earlier post, but quite right bruken, you just never know do you?
Dave.
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Old 10 Mar 2011
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You'll be suprised what some people can do, and I'm no exception. I had a good mate who fully assembled his camshaft tensioner before putting it into the bike. How he torqued it down is still a mystery to me. Within 20 odd miles the cam chain had broken. He also complained bitterly about how much oil he was leaking until he found he had 6 litre in instead of 2.6 because he was overly fastidious. I have a early Tiger Steamer that you HAVE to take into concideration that when you torque down the cam caps it will almost certainly jump a tooth. Granted the XT doesnt have cam caps but the load principle still holds true. These engines are so easy to work on that it also has the unfortunate consequence that less than profficient peeps are willing to and do climb in happily...wouldnt dare do the same with their cage or gixxer tho. I cut my teeth on the XT550, and I'm not even going to begin telling you the cockups I made while learning, now I restore classic bikes as a hobby and even now I still have "fun" moments.
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