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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 Alessio Corradini, on the Salar de Uyuni, Bolivia, of two locals

I haven't been everywhere...
but it's on my list!


Photo by Alessio Corradini,
on the Salar de Uyuni, Bolivia,
of two locals



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  #16  
Old 16 Aug 2015
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hi there ive been out all day but a few hours ago decided to go for it , so red to red wire, brown to brown wire , remember my red/ brown wires have always been crossed , AND BIG FAT BLUE SPARKS . i carnt atempt to start bike the wiring loom still needs some small repairs and taping back up . with the plug out i can get blue sparks with my hand working the kick starter , it will be a couple of days before i can try to start it up , also i had to reuse the stator cover gasket so this will have to come off for a new one to get a oil tight seal also need to replace the 2 o rings . so i am not out of the woods yet , i will post back later to update, can i thank you steveloomis for ALL your help and time, your experience and knowlage has been great .
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  #17  
Old 17 Aug 2015
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Your success makes it worth the time. Please let us know how it runs etc.

Be sure to check the wiring in the stator cover where it goes thru the rubber boot. Mine was leaking oil past it and it was running down the neutral light switch wire. If yours is leaking past it, just carefully remove and super clean all the oil from the surfaces and the rubber grommets. I sealed mine using Yamabond and it does not leak a drop.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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  #18  
Old 23 Aug 2015
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hi guys ( steveloomis) sorry been a week since posting been busy most of the week, but friday repaired most of wiring mainly multiple wirers that were crimped together i soldered together , they were all fraying where the crimp was . so spark plug in, petrol tank on and it fired up 3rd kick and seems to rev up ok , still some more tieding up to do before test ride , so will post when i know more , but so far so good . zigzag
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  #19  
Old 30 Aug 2015
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hi guys well finally managed to go for a ride to bike shop 6/7 miles away to pick up alternator gasket / o rings (had to reuse old ones) and all seems well no popping on low revs when changing gear , starts good . its been a big problem to sort out but i am a little wiser for it all, its the first big problem ive had on my xt in 8 years ive had it . i will get the old stator repaired and buy a spare cdi . so fingers crossed . again thanks to steveloomis for the help . zigzag
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  #20  
Old 8 Sep 2015
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hi there guys the starting problem has returned but only when the bike is hot , all seemed ok after the replacement stator , but after getting home from a mates house yesterday the bike was turned off for a few minites then i needed to set off again but no joy . i had a hot drink then quickly got the plug out to check for a spark the spark did not seem as strong or as blue as it should have been anyway back in with the plug and a drain of the carb ( i dont think the carb is the problem )and the xt fired strieght up , took it for a quick spin and all was well got home and turned it off and back on again and all was ok . got home from work today did not go on the bike, it fired up ok went for spin as soon as it got hot i turned it off, it started but only just after many kicks i tryed this a few times sometimes it would start first kick the next it would be 5-10 kicks i got home took off the tank etc and measured the ohms of the sorce coil it was 250 ohms but the engine was hot not warm it says in the clamer manual the stator has to be 68f of 20c and measure 200 ohms + - 20% so 160-240 . as it cooled down it went down to 225 ohms , so guys ( steveloomis) has my cdi gone west , when the bike is cool i have big blue sparks again . this is getting to be a big pain so need to sort it out zigzag
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  #21  
Old 8 Sep 2015
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Certainly could be a sour CDI. Funny how the idioms change, in the USA when something goes bad we say it "Went South" Why? I dunno....
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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  #22  
Old 8 Sep 2015
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Put a heatshield between your carbs and engine. Keep the heat away from them and see if it gets better. Also when you first shut it off, kick it over till you hear the decomp click, again see if it gets better. One of my main hates with these older kick bikes is the hot restart issue. The fuel vapors "flood" out the motor and it can't start, not enough O2, especially when it's jetted rich at idle. Look into that as well.

Since I ride all winter, I tend to run my bikes on the rich side rather than re-jetting spring and fall, but I have to let them idle if running in to the store for a few minutes because I often would have to wait 10-15min (depending on ambient) if it was hot. Didn't do it everytime and got way better with a heatshield and turned over to TDC when shut down. Not an issue in winter or fall when it was cold out. Same thing with both aftermarket cdi's I had. On the one that I didn't run in the winter and was jetted leaner, not much of an issue.
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  #23  
Old 8 Sep 2015
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Good info JJ. I've seen this heat shield idea before and it does have merit, keeps heat from carbs so gas does not boil and flood the engine.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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