Haven’t made much progress repair-wise, but I’ve started to poke around on that CL100, and have a better idea of what it needs. Here’s what I found.

(Reminder: this is phase 1, in which I will only be focusing on getting it running. Things like lighting and cosmetics will be addressed later.)

I removed the battery, which (sure enough) was low on water. I don’t think there’s much hope of it being usable after all this time, but hey- distilled water’s cheap. Let’s top it off and see if it will hold a charge anyway...


Fuses are good and all wiring looks okay. I’m not seeing any wear, corrosion, or evidence of critters chewing on things.

The rust in the fuel tank is even crustier towards the bottom. I’m in the middle of setting it up for some electrolysis to see if it’s worth restoring, or if the rust removal is just going to uncover some brand-new leaks. One of the forward mounting bushings is gone, so I’ll have to find a replacement or see if I have a spare chunk of rubber laying around that can be cut to size.


I am missing the bowl that screws into the bottom of the fuel valve. Seems too small to be a filter housing. Maybe the filter is supposed to be an inline type after all. I’d like to remove this valve to clean it, but I can’t find any screws. (It doesn’t just pull right out, does it?) If I can’t get a bowl for the bottom, maybe I’ll just get a whole valve assembly to replace it.

You see what happens, Larry? This is what happens when you leave behind some 30-year old gas!

I opened up the carburetor, and it’s pretty gunky in there. I found a good video on cleaning the carb, and just might have to get my hands on one of those nifty ultrasonic cleaners. (I don’t think my parts washer is going to do much for cleaning those tiny fuel passages.) The seals are all hardened, but those will all get replaced once I get my rebuild kit. Fortunately, submerging the float isn’t showing any leaks.

I drained the oil and it’s not sludgy. It is a little dirty, though, and I’m sorry to say I found some metal (non-ferrous) particles in it. My father tells me that he was having trouble with getting the drain plug to seal, and may have cross-threaded it. Maybe that’s what these particles are from? The drain plug is stacked with one (nylon?) washer, two cork washers, and a smear of RTV. Lovely.

Magnifying glass because potato-cam

The spark plug is dirty, and the top of the piston looks the same. I haven’t seen the rest of the combustion chamber yet, since the piston just about at the top of its stroke, and I have not yet attempted to turn the engine.

Spud-scope view of the piston head

With the carburetor off, I decided to take the exhaust off as well. Here’s what I saw inside the intake port, and the exhaust outlet.

Intake valve
Exhaust valve

While I had the spud-scope out, I took a peek inside the crankcase, too:

Next step is to complete my electrolysis rig for the fuel tank and let the pixies do their thing. I will also get a rebuild kit for the carburetor and work on cleaning it while I’m waiting for the kit to arrive. My chargers are 12-volt, so I’ll have to pick up a 6-volt one for this battery.

What are your thoughts? Anything I ought to do before I turn the engine and draw the piston down the chamber? Could those particles at the bottom be just broken off bits from a previously cross-threaded drain plug? (It seemed to unscrew just fine.)