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Projects / Re: 73 TX500 Resto
« Last post by quattrodave on March 31, 2020, 04:09:50 PM »
Did you see the thread both lumpy252 and I replied to on the Tytronic ignition, I have it working on my bike sucessfully but to get it so needed the pickups repositioning by around 30 degrees further round as the cut out in the advance rotor is in the wrong place, however it fitted my original advance mechanism without any washer spacers and without having to dismantle the unit, I just twisted the original centre piece off and put the new one on over the bob weights.

Thread here - http://www.xs500forum.com/index.php?topic=2166.30
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Projects / Re: 73 TX500 Resto
« Last post by lumpy252 on March 31, 2020, 01:15:30 PM »
Sorry I wrote it the wrong way round it should read that I put in the extra thin washer in as the new rotor was not sitting slightly below the governor centre shaft like the original Yamaha item did.
Great job on your restoration by the way .
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Projects / Re: 73 TX500 Resto
« Last post by lumpy252 on March 31, 2020, 11:56:57 AM »
Hi there the tytronic system that I tried out on my 1975 Xs500b needed those alterations too , although one minor addition I did not mention before on this site is that I added an extra thin washer under the existing breaker shaft end washer and nut, inside the rotor .I did this to lift the end nut slightly, as I thought that the new rotor was not sitting quite as far past the governor centre as the original Yamaha item. This could mean that the tytronic rotor is pinched in place by the breaker end nut and not allow totally free movement of the advance mechanism. This may explain the reluctance to return smoothly to idle that you describe.
Interested to hear that you fitted this system . Hope all goes well for you travel wise and in everything else of course.
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Projects / Re: 73 TX500 Resto
« Last post by mvluv13 on March 31, 2020, 08:10:49 AM »
I have the bike running on the tytronic ignition. Modification to the base plate and the rotor was necessary. It has an issue now that the revs don't drop that fast when you roll off the throttle. Maybe the advance mech is getting stuck? If I ever get home I'll keep looking into it.
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Projects / Re: 73 TX500 Resto
« Last post by mvluv13 on March 31, 2020, 08:04:43 AM »
Will have to check when I get home.
Pretty sure I stuck with the factory sizes of 3.25 front and 4.0 rear.
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Fuel System / Re: is this needle pin adjustable??
« Last post by Ted Bundy on March 30, 2020, 07:57:03 PM »
Thanks. 🙂 I just raised the pin and the slow/dead spot is gone. Runs great now from start to full throttle  :)
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Fuel System / Re: is this needle pin adjustable??
« Last post by guylr on March 30, 2020, 07:33:30 PM »
Yes it should have an adjustable needle under that cap. Starting in 1977, to comply with emissions regulations, the factory had to begin making it harder to get at the needle to adjust it. So you have to remove that circlip to remove the cap and get to the needle beneath it.

Later carbs from 1980 or so started using needles with no adjustment grooves in them. At that time we started shimming under the clip to raise the needle and richen the mixture by using one or more 3F7-14952-00 (0.5mm thick) washers. Using two was the equivalent of raising the needle one clip position.

Guy
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Fuel System / Re: is this needle pin adjustable??
« Last post by Ted Bundy on March 29, 2020, 03:22:25 PM »
Many thanks 🙂
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Fuel System / Re: is this needle pin adjustable??
« Last post by lumpy252 on March 29, 2020, 03:19:46 PM »
Look on Babbitts site the 1978 xs650e seems to be the one you have and yes it shows an adjustable clip under there.
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Fuel System / is this needle pin adjustable??
« Last post by Ted Bundy on March 29, 2020, 12:41:23 PM »
(BS38)  should be 78-79 from a XS650)

Can anyone tell me if the needle pin is adjustable? Just curious before I "rip it apart"  :o

The old carbs from -76 did not have a retaining ring in the bottom, so its hard to see if there is a clip down under..

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