Max had a stroke

[trbig]

Tod - On the XJ coils where the wires go in, is there a short tunnel and a long one, or just two short tunnels? Are the specs the same for the XS and XJ coils (3.3 ohm primary resistance, 15k ohm secondary, 15k volts output).

Hmmm.. Let's try this again..

I'm definately not the go-to guy for electrical stuff,

I have no clue as to the ohm or voltage values to what wires though...

Now.. what was the question again??


Tod

[madmax-im]

If they're anything like the '81 XS coils they can still be changed. The wire that goes into the short tunnel is soldered to a small copper lead that disappears into the coil body. You have to grind it down slowly with a dremel tool until you start hitting metal, and then carefully grind around the metal until you uncover the soldered connection. You can tell when you're getting close when you start hitting a white gummy substance (no comments from the peanut gallery ). At that point you can unsolder the connection, unwrap the copper lead from the wire core, and by twisting and pulling withdraw the wire. Then you strip the insulation off maybe 1/2" (sorry metric guys) of the new high tension wire, put a little wd-40 on the end of the wire and insert it in the tunnel. Solder the copper lead to the high tension wire core, RTV it, and after it has cured for 24 hours put a piece of duct tape over the repair and use a zip tie around the coil to secure the wire. I don't think there is a way to do it without doing a little destruction first.

Tod - On the XJ coils where the wires go in, is there a short tunnel and a long one, or just two short tunnels? Are the specs the same for the XS and XJ coils (3.3 ohm primary resistance, 15k ohm secondary, 15k volts output).

If they are I have a set out in the man cave I was going to redo that came off an '81 XS. I'd be willing to redo those and exchange them for Max's set if he's willing to spring for the wires - if the DMM shows them to be bad, and assuming the readings on the set I have are within spec when the deed is done.

Well its gonna be several days before I can get back to troubleshooting the Max...so at this point we all will have to wait til the weekend...just too much other chit going on...To be cont...............

[dbeardslee]

Now.. what was the question again??

Tod - let me rephrase it (with smaller words ), do you know if XS coils will work on an XJ?

[DGXSER]

Doug, you forgot the BIG pictures and Really big Text!!

[dbeardslee]

I answered my own question (no big text needed ). According to the Yamaha fiche the XJ and the XS SH have the same coils, so the readings should be the same as well.

[madmax-im]

I answered my own question (no big text needed ). According to the Yamaha fiche the XJ and the XS SH have the same coils, so the readings should be the same as well.

Ah ha! In the back of my mind I knew this already but I guess the brain cells must be dying off...LOL yes the Specials and the XJ coils are interchangable...
Actuall TC replaced on of the 2 coils last year...I will have to re-read the thread where he discussed what we had done to the bike last Aug

[dbeardslee]

Mad - I wonder if it was the coil on 1 & 4 that you guys replaced. That would sure make sense.

[rickmc2000]

Max had a stroke

Well yesterday I ran about 100 miles and rode thru a bad thunderstorm and got pummeled by rain and wind...after about 10 mins of this I found a spot under an overpass to get out of the rain...10 mins later sun came out and i continued home...bike ran fine...this a.m. I start him up and he idles down off the choke..ok warmed up and I head out for a run...about 8 miles down the road and he starts intermittently running rough...then I smell raw gas..then he runs right...for a mile then starts running badly...again I smell gas...turned around and limped home...bike ran rough and had no power...at home I do the water on the header pipes trick and lo and behold #s 2 and 3 headers are cool no sizzle...so without going into it yet I suspect its the coils...not firing 2 cyls and the raw unburned gas going thru the carbs is what I smell...dunno what I am gonna do...i'm not an electrical guru..so I will start by looking at the carbs.

My 78-E does the same thing when I wash it. I run it till it dries and it clears up and has a full recovery. Once you get it dry, you could silicon spray the plug wires, boots. Might help.

[madmax-im]

Mad - I wonder if it was the coil on 1 & 4 that you guys replaced. That would sure make sense.

Nope..it was the 2-3 coil...I just went back to my thread from last year and reread it...so could it really be bad? Will know soon...to be cont....

[madmax-im]

My 78-E does the same thing when I wash it. I run it till it dries and it clears up and has a full recovery. Once you get it dry, you could silicon spray the plug wires, boots. Might help.

curious ...do these symptoms show up immediately after washing? In my first post I explained that the bike still rode fine that day..and the next a.m. it ran fine for the first 8 miles before it went south...

[Axel]

Specs

Primary 2.5 ohms plus or minus 10% at 68 degrees F
Secondary 1k ohms plus or minus 20% at 68 degrees F

[dbeardslee]

Mad - did you and TC replace the wires on the 2/3 or the entire coil assembly? You might want to take a look at the wires and connectors that go to the 2/3 if it has a history of failure. Still a good idea to test the 2/3 using the DMM though - at least now we know what the readings should be.

[Axel]

Switch triggers

There is a way you can switch the trigger wire plugs(red/white and grey or red/white and orange) for each coil to see if the condition jumps to 1 and 4 ( test with water mist on header pipes). If it switches the coils are good .

[dbeardslee]

Axel - where did you get those numbers from? if they're the same as the SH coils the primaries should be 3.3 ohms and the secondaries 15k ohms with the caps removed.

[Axel]

XJ baby

They are from the XJ manual . Caps off .