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Author Topic: My first bike, the 1974 XL100  (Read 3538 times)

Offline iatethepeach

  • Posts: 509
My first bike, the 1974 XL100
« on: Jun 10, 2016, 19:57:18 »
Hey enduro fans, look what I dug out of the back of the shed this spring:



My dad bought it new in '74. He used to take my brother and I for rides around the hill on it, then taught me to ride it about as soon as my feet could reach the pegs. It's been buried at my parents' place since the 80's. Since I'm having so much fun with the scrambler, my dad told me I should do something with the XL. Let the healing begin!

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  • Nick Ol' Eye
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Re: My first bike, the 1974 XL100
« Reply #1 on: Jun 10, 2016, 20:06:41 »
A much better start than what I've got! I do love the orange creamsicle color scheme. I'm in for this.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline iatethepeach

  • Posts: 509
Re: My first bike, the 1974 XL100
« Reply #2 on: Jun 10, 2016, 20:12:24 »
Ha! Yeah, storing a bike inside does wonders. Mice can only eat the stuff that probably needed to be replaced, anyway.

The piston was free when I got the XL out of the shed and my dad found the title, so I felt I was off to a good start. The chrome was heavily pitted in places, and there was plenty of rust, dings and scrapes, but on the outside the bike looked like it'd go.







Note to self: spray WD-40 on everything next time and save your future self some hassle.

I hesitated to open the gas cap.


Offline iatethepeach

  • Posts: 509
Re: My first bike, the 1974 XL100
« Reply #4 on: Jun 10, 2016, 20:36:54 »
Thanks, fellas.

So, yeah, the tank turned out to be the first question-mark:



I had almost as much fun cleaning this one as I did the scrambler's. For better or worse, there was no decaying liner to deal with this time, but the varnish from the ancient gasoline was just as fierce. I'd have thought all the liquid gas would have evaporated in 30 years, but there was plenty still in there (and chock full of crystals). I'll spare everyone the endoscope videos, but after much labor and beers I finished scraping out the varnish and treated the rust. The original petcock was a loss but I got a replacement and the tank's now solid, clean, and ready to go. Only one drip mark on (what's left of) the clear coat from a round of acetone gone wrong. Things could be worse- chalk up another win for the iatehtepeach high-tech/low-tech endoscope and coat-hanger method! And maybe drink fewer beers when working with acetone.
« Last Edit: Jun 10, 2016, 23:07:16 by iatethepeach »

Offline iatethepeach

  • Posts: 509
Re: My first bike, the 1974 XL100
« Reply #5 on: Jun 10, 2016, 21:21:42 »
When I got the carb apart it looked pretty much like you'd expect. The slide was stuck and no amount of carb cleaner or wishful thinking would get it moving.




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Re: My first bike, the 1974 XL100
« Reply #6 on: Jun 10, 2016, 21:34:49 »
I had the same problem on the XL. If you haven't already gotten it out yet, I spend about a week spraying it with PB blaster. Some heat would probably help. I put the carb in the vice very carefully, wrapped copper wire (steel would be better) around the plunger that screws into the slide and the other end around some needlenose or another lever, and pried against a block of wood on the top side of the carb body. Took about an hour of repositioning and winding the wire, but it finally came loose.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline iatethepeach

  • Posts: 509
Re: My first bike, the 1974 XL100
« Reply #7 on: Jun 10, 2016, 22:35:21 »
Thanks, adventurco! I read that on your turd thread but by that point I'd already gotten my carb cleaned up (timing). Anyway, I can use all the tips I can get so please keep them coming.

The route I took with my carb was a little different. I'd read about the Pine-Sol trick somewhere and wanted to give it a try. So I disassembled what I could and let it all soak for a few hours. The upper body discolored a little and there was still some varnish here and there, but the slide did free up and all the jets and float assembly came apart easily. My bottle of Pine-Sol had been sitting under the sink for at least 10 years, anyway, and watching the concoction turn milky white was worth the entertainment alone even if it didn't work to the magical extent the internets led me to believe might be possible.



There was another technique I'd read about and wanted to test, so next I went to Salvation Army and bought a used crock-pot for $2.50 (!). Then I cooked everything in a quart of antifreeze overnight.

« Last Edit: Jun 10, 2016, 23:26:22 by iatethepeach »

Offline iatethepeach

  • Posts: 509
Re: My first bike, the 1974 XL100
« Reply #8 on: Jun 10, 2016, 22:38:30 »
The crock-pot seemed to work about as well as the Pine-Sol, which is to say, in the end I had to pull out the dental pick to scrape off the last bits of varnish and gasket gunk (but not a lot). Then I scrubbed everything one last time in a carb-cleaner bath before replacing the seals with a new Honda kit and reassembling. All the parts appear clean to the eye, for what that's worth, and the floats seem air-tight after a test. I have my fingers crossed.









By the way, crock-pots are normally $5 at my Salvation Army, but on Mondays all "electronics" are 50% off. I didn't know that and just got lucky. So try to go on a Monday.

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Re: My first bike, the 1974 XL100
« Reply #9 on: Jun 10, 2016, 22:53:57 »
Sweet. Crock pot is a good idea. I let the stuff soak in pinesol for 2-3 days...but my mix may be diluted with water, cant remember I've had it for a long time. It works well but the aluminum develops surface oxidization within a few hours so I usually clean it with solvent or hit it with WD-40 after.

I actually put the head on the turd in pinesol for a couple days....it took a lot of the carbon of the valve seats, go figure.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0