I got this Honda SL100 for $350 with a title two years ago.  I made sure it had good compression before buying because of the added cost and complexity of rebuilding the 4 stroke engine.
 
 
It is finally finished. The paint scheme was inspired by an SL100 some neighborhood friends had back in the day.  I remember them winding the bejeebers out of that machine.  Honda claimed peak power at 11,000 RPM for the SL100 so it makes sense to wind it out.

Here is the final product:
 
  
  The SL and XL machines were an effort by Honda to cash in on the Yamaha Enduro success.  The Hondas always seemed to be 20 pounds or so heavier than the Yamaha Enduros they were designed to compete against on the sales floor.  This one weighs about 210 pounds versus the HT1 and LT2/3 that are about 190 pounds.  I did put on 21 inch front and 18 inch rear wheels instead of the stock 19 front and 17 rear.  There is a better selection of 21 and 18 inch tires.

  There were two problems that I had on this bike that were not straightforward. The swingarm play required shimming the frame and special Loctite.  I also had difficulty setting the timing and valve clearance repeatably because the plain camshaft bearing in the head was worn.  I ended up machining the points base to accept a narrower seal and a bearing to support the camshaft.

Thanks to everyone on this forum for sharing their knowledge and experience.  I have learned a lot from this forum and applied that to this machine, especially paints and clear coating.  Even some of the parts I used were from contacts made here. Thanks to members Deet for the silver wiring harness tubing and BBD83 for the tank and tail light.

Now back to working on my DT400C avatar, which has been sadly neglected during this time!

Looks real nice restore. SL100 & 125 were great little bikes & where i worked we had Honda & Yamaha back in those days so learnt to repair both makes. Still have variations of those motors in two of my mix n match relics dirt bikes. Back 30+ years we used highly modified 100 & 125's in miniature roadracing down here in nz. Big megacycle cam plus high comp piston & stuff, porting etc. Had huge blow ups when the conrod couldn't keep up haha. Love your work!!.

Nice work.  Beautiful little machine!

I've always wanted one of the early 70's Honda 175 twin scrambler...  don't remember the model letters.  That little engine screamed and had that twin sound.

CL-175 was the one with the up-swept pipes; CB-175 was the road bike with the down pipes. I had a CL-175 for a while. Nice road bike, but not much power; I found myself shifting at the first sign of an uphill. And it weighed 300 pounds, I think. We're better off with a CT Yammie.

Yes, CL... And of course the CT is a better bike. 

But the little Honda's are nice too.

Honda also made a SL175 for a couple of years with the 175 twin engine.  It weighed in at 249 pounds dry versus a same year Yamaha CT1 at 211 pounds dry.  That's a 38 pound weight advantage for the CT !

 
 

I have one of these. Or at least i do for about 3 more weeks until it gets picked up. Very nice little bikes. I'm a Yamaha guy all the way but hard to choose between this bike and a 1970 CT175 especially if you do more road riding then dirt in your dual purpose riding. 

 

I always like the Honda SL’s, great looking bike. Don’t worry about the non-Enduro posting, I might be the biggest offender and they haven’t booted me, at least not yet. LOL.