Found another project ‘74 Suzuki TC125 Prospector

[Mbaird]

I imagine that Maico is a ripper

52 hp… but it weighs 230 lbs .
Lol

 

[HWYCRZR]

Started tearing my engine down to see how much work or refreshing I need to do. Turns out the eight different puller sets I own are not quite right for motorcycles. So I had to add a few new pullers and installation tools. Good thing they are fairly cheap. I guess now I need to go into the motorcycle repair business.

 

[HWYCRZR]

Engine pictures. I take a lot so I can remember how the little parts go.

 

[HWYCRZR]

I measured the piston and bore. It was actually in really good shape and the bore still relatively round. Spec was no more than 0.002 between 6 different measurements between smallest and largest. Was at 0.001 to 0.0015. Depending on how I held my bore gauge. So I will just hone it out and re-ring. For sitting 36 years it looked pretty good inside the crank case and gearbox. Head was pretty carbon free and the piston had maybe 1/64” of build up. Cleaned off pretty easily. I used to run it wide open so not much chance of buildup.

 

[Mbaird]

You must have used good oil at the correct ratio back then .
I ran Golden Spectro on my 75 Yamaha MX250 and my 81 KTM 495 back in the day.

 

[HWYCRZR]

The old Suzuki’s have a pretty robust oil injection system one line lubes the piston and one the main roller bearing. As the throttle increases the pump pressure and volume increases. I am sure we used whatever 2cycle the Cenex carried.

 

[65sporty]

You must have used good oil at the correct ratio back then .
I ran Golden Spectro on my 75 Yamaha MX250 and my 81 KTM 495 back in the day.

I had a 80 Yamaha YZ125 in the mid 80's and I also ran Golden Spectro. Works great

 

[Mbaird]

The old Suzuki’s have a pretty robust oil injection system one line lubes the piston and one the main roller bearing. As the throttle increases the pump pressure and volume increases. I am sure we used whatever 2cycle the Cenex carried.

The lack of carbon build up and nice bores lead me to think good oil .

 

[Furyos66]

Story of when I bought it.
My motorcycle riding started when I was probably in 4th or 5th grade. My cousins had a little Yamaha Y-zinger 50, so when we went to visit we would zip around on it. Helmets? No. They were too expensive, plus the grass was soft.
Anyway when I was in 7th grade Mom and dad said we could buy a motorcycle. I found a pristine’68 Honda 125 street bike that I think I paid $150 for. It was a 4-stroke engine that ran beautifully. When I got it, it never saw pavement again. It was my dirt bike. In about 10th grade I traded the original street tire fo a knobby tire to better climb hills. We after another hard year I got a flat tire and discovered the rear axle was bent. And couldn’t get the wheel off. So I was down. My friend Jimmy, said he would sell me his Suzuki 125 (the one in this thread). I test drove it, it ran pretty good (it only cut out once, but started right back up when it cooled down). So I bought it. I took it home and dammed if every time it got warm, it would quit. I struggle a few weeks and then determined that it would quit getting spark. Finally figured out the point gap was too close. When it got warm, they would close and kill the engine. I adjusted the points an never looked back. My friend Jimmy offered me $250 or $300 to buy it back. No sale. Again I rode the crap out of it through our pastures and coulees.
Time for its second life.

Nice bike!
I just recently acquired one of these.
Appears to be all original, except for paint and decals.
Wish I was 25 years younger.