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Yamaha XT600E 3TB - cold starting problems Yamaha XT600E 3TB - cold starting problems
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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.
Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
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Mount Fitzroy, Argentinian Patagonia



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  #1  
Old 21 Nov 2017
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I have same model, idle screw 2,5turn out and never any problems starting or idle. I had problems with carb before cleanup, it was the small filter inside with full off dirt making it. So yes remove carb and check filter, and the boots from carb to engine.
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Old 21 Nov 2017
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I have same model, idle screw 2,5turn out and never any problems starting or idle. I had problems with carb before cleanup, it was the small filter inside with full off dirt making it. So yes remove carb and check filter, and the boots from carb to engine.
The boots are like new and the rubber is really holding good (I think they were changed recently 1-2 years ago before I purchased the bike).

The small filter I cleaned it maybe 6 months ago but I will remove it completly and install an inline filter on the hose. Any recommendations on this filter ?

Thanks for trying to help me out !

Bernek

L.E. the carburetors were cleaned using carb cleaner and compressed air in summer and I also used a carb repair kit for this model to change all the bits and pieces that are user serviceable.

I will have to solder a small screw on the pilot jet screw so I can adjust it easier... just need to find a brass screw with the same proportions. I hate burning my hands each time I'm trying to adjust this one.

Any settings for needles that you might share ? as I've stated the "mechanic" had to move them to middle position and I don't really like the spark-plug coloring that I had ... the photo is from the spar-plug that I've used maybe 1-2 months and it has close to 1000 km on it (mostly off-road). Is carbon build up really fast on these big singles ? Since the bike idled some time before I took this spark-plug out ...
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Old 21 Nov 2017
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No i dont have any build up on the spark its normal colour, honestly i dont remember the original settings on needle. I changed to dynojet kit, did you buy original or cheap china kit for carb? What size of jets do you have? Search forum, its all in here we have talked bout same problem before so i think you will find jet setting. If you dont find let me know, i have another original i can open and check.
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Old 21 Nov 2017
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Originally Posted by xtrock View Post
No i dont have any build up on the spark its normal colour, honestly i dont remember the original settings on needle. I changed to dynojet kit, did you buy original or cheap china kit for carb? What size of jets do you have? Search forum, its all in here we have talked bout same problem before so i think you will find jet setting. If you dont find let me know, i have another original i can open and check.
The kit was not made from Yamaha but from another company (I can't remember the name) but the price was similar to an original kit. No way it was dirt cheap like chinese kits.

I think I payed close to 100 EUR for the entire kit. Chinese go for 10-15 GBP on ebay.

Regarding the needle position I searched in past (on this forum) but couldn't find something stated clearly. Just when you have time would be nice if you can check the original positions (so I can have a solid start in tuning).

I will try to start the bike again tonight to see how it will fire. I also have some doubts regarding the battery ? Since it transistored (TCI) it can't work without a battery and I might get a weak spark from an old battery ? Mine has 6 months and it was bought in spring 2017.

This is the battery that I use.

And with that weak spark and cold engine it could behave like I'm experiencing ?
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Old 21 Nov 2017
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It seems to me like this carb doesnt have been adjustet, but cant be sure. The diaphragm was 3notch, spacer and plastic under, remember to have hole free for the breathing in it.
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Old 21 Nov 2017
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It seems to me like this carb doesnt have been adjustet, but cant be sure. The diaphragm was 3notch, spacer and plastic under, remember to have hole free for the breathing in it.
So secondary (vacuum type) is 3rd notch.

Primary carb ? what position for the clip ?

Also 3rd notch you count from top (blunt end) ? Needle in working position I count 1-2-3 and on the 3rd that is middle position ? I think it has 5 positions.

Thanks a lot !
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Old 21 Nov 2017
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Slow down man i have take it apart first yes both was the same place, center of the pin. 3rd from up or down its the same. Anything else?
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