New points checked against old.  A bit of research gleaned a bit of info that despite having different part numbers, the points were interchangeable between the DT100 and the FS1.  A bit more gleaned the info that the FS1 part number fitted everything from the TY80 to the TY175.  We have the same points between many models, often with different part numbers. 
Armed with a few part numbers, I went ferreting about on ebay.  I had a hit on a set of Daiichi points listed for a Honda C70 step through but with a Yam part number on the box.
Likely because a step thru is far less "sexy" than a two stroke enduro, and not being a likely candidate for a restoration, they had not had the NOS " premium " added on to the price.
So there you have it, more leads to go on.  

£5.39 delivered to my door vs £12 for a set of unspecified make from aftermarket.  Just because the pic showed points with a Daiichi trademark, the description did not specify the make they would send.  Probably chinese tat like the ones I removed.


Honda C70 and DT100 points are the same.  It pays to do ones homework.  I love ferreting around.  It is part of the fun.
cheap on top, Daiichi on bottom.  I appear to have clipped the bottom of the pic.  The heel was identical in size and angle.


Cleaned the preservative off the point faces, tested them for good contact, fitted them and did my due diligence testing before setting everything up.  Hmm.  Black wire was grounded whether points were open or closed.  Disconnect condenser wire and put probe in its place. Points breaking contact.

The condenser has an internal short.  I snipped the wires to test.  It does not hold a charge.  

So there we have it.  Bad cap.  It explains the odd readings I was getting.

 

Sure doesn’t look like much to keep the ignition wire from shorting out on the top set…
Sneezles61

Rattling around the house with three dogs. It is home alone weekend.

The missus has gone to London for the weekend with her coven of witches to see Mama Mia in the west end. I pity London... A full coach of cackling women descending on it.

Anyhows, I digress. It seems like a two step forward and two step back kind of day.

A new Daiichi cap has been ordered and the ignition is on hold.

Meanwhile, the  genuine Yam RT100 clutch cable has arrived. It fitted like a glove, unlike the chinese garbage the aftermarket boys tried to sell me.

Confirmed. RT100 clutch cable. Part Number 3M1-26335-10 is a direct replacement for the marked as no longer available DT100D, 1T9 cable that fits DT100 1977 - 1983.

Soldered the condenser leads to the stator wire and to the flag terminal that goes to the points.  Refitted the stator and put on the rotor finger tight. Set the points gap by mk1 mod 1 eyeball and checked they were opening and fully closing.

​​​​​Kicked the motor over.... Nothing.

Had a quick look around.  Put the killswitch to run ( it is a rotary with two outer stop positions and run in the middle) 
Slapped myself around the head a little for being a dick and kicked it over.

Beautiful big fat blue white spark.  Yey!

Because the conservatory is cold, cramped and with very little room to work in, that was enough of a result to call it a day.
I can only stand it an hour at a time in there, kneeling on cold floor tiles with typical heavy equipment engineer issued knees.  They need a good greasing, but unfortunately did not come equipped with grease fittings.  Sealed units and the grease within old, dry and contaminated with debris. 
No choice but to creakily stand up,  slowly get them moving again and get the hell out of there.

I will set the timing and button everything back up tomorrow.

 

The benefits of aging are few… well, after having worn out the body from swapping hours for dollars..
Sneezles61

I disagree. The benefits of ageing makes you appreciate the simplicity of youth.
If you knew what you know now, would you have done what you did then?

Also, your proudest moments. Without the energy and optimismism of youth, would you have accomplished the things you are most proud of?

The young uns at work see me creak into work of a monday morning and look sympathetic.

I say no.. Do not look at this creaking old gate as a failure, it is worn out out from living an inordinately wild and exciting life. I have done things that you have yet to experience and have faced death from pushing the limits of pure luck many times. I am fortunate to still be here to pass on some of my wisdom. You may not understand now, but when you need it, you will recall it.

Yep, Im the same. knees are done. back is done, eyes are done, belly grown out of all proportions, and a few other bits have stopped working without a kick starter!!!!

"Yep, Im the same. knees are done. back is done, eyes are done, belly grown out of all proportions, and a few other bits have stopped working without a kick starter!!!!"

Amen to that.  Everything fine and fairly unchanging, apart from the worn out bits resulting from a very misspent youth doing stupid things on motorcycles, other ill advised "stunts" ( i survived a crash involving a 30ft cliff edge and a home made hang glider) and drinking beer.  Lots of beer.
To date my current count of broken bones is 17.

Until my 50th when the rate of decline fell off a cliff.....

​​​​​​Back to the bike.  I had a final check behind the stator to ensure that none of the wires would be rubbing against the rotor or trapped.  Spent a very frustrating half hour on my knees timing the ignition and fighting with screwdriver against magnet.  Got the points opening at 1.85mm btdc, close enough for me, and nipped the rotor nut up.
Final check to make sure the points were opening and closing.

Plugged the stator harness back in and final check for spark. 

Spark has vanished and I have no idea why.  I wil look tomorrow, my knees hurt and I am out of patience.

The other task I set for today was to fit the chain.

Ordered the chain specifically for the DT100.  102 links.
Idiot aftermarket supplier thought it was ok to send one with 110 links...   says 110L right there on the box.

Luckily I still have my professional Whale chain cutters sets from my motorcycle techie days, so it was a two minute job to cut it to size, took longer to dig them out of storage; but many customers will not have access to chaincutters.  The aftermarket vendor has no excuse.

Those Whales have seen a LOT of chain cutting and rivetting action.


And chain fitted.  It says 110 links right there on the box....  

 

Stopped sulking and went to have another look at the spark.  Kicked it over, nothing.  Put a cloth over the plug to shade it and wiggled the plug to ensure a good ground against a head bolt.

Kick.  We have spark after all!  Plug must have jiggled a bit and the ground was lost.  It is very temperamental getting a good ground with all the fresh paint.  Plug must be HARD up against a head bolt.  

I put a couple of drops of premix down the plug hole and screwed down the plug.

Ignition on and kick.  She popped off immediately for a half a second.  Yippee.

Encouraged I loosely plonked on the fuel tank, cut a fuel hose and put the tap on reserve, watching the float chamber overflow tube closely.  No drips.
Nah, never happens.  I suspiciously pull off the fuel hose to see if it is getting fuel.  It was.

Well I never.  I finally had a bit of luck.

So, as a tribute to Derek from vice grip garage, a few drops of premix straight down the carb throat for good measure, waaaaay too much.  Perfect.
Choke on, ignition on and kick...

Second kick and away she goes!  Yippee.

Making smoke and generator rotor doing rotary things.


First check, set throttle stop screw to allow a fast tickover.

Second.  Does the clutch work and do we have five in the box?  It does and we do.

Third, pull off the oil line, pull back the pulley to get max pump stroke,  get it bled, get the measuring cylinder under the end of the oil injection pipe and count 200 pump strokes.  Do we have the required 5ml? 

We do have the 5ml.  Pump is good.  Still no sign of oil leaks or bad check valve.  I can fill her up with normal fuel now.