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Put new rings in my CB125S and was all excited to ride today, but nothing went to plan. At first, there were fuel problems. I hate these fucking brass floats. Got it fixed. Then there were electrical problems. Going to solving this with a new wiring harness in the next couple of weeks...

I recently finished my first top end rebuild on my '74 CB125S. I can't wait to kick the little bastard over, but I'm not sure how to break in the new parts. Some articles have said to not go full throttle and be extra careful, some have said to pretty much ride normally and check the oil more...

Bought some clip ons for my CB125S, but lost the inserts which bring them down to 27mm for my bike. They're no good for me now so maybe one of you guys can use 'em. They are Chinese but the quality seems decent. And they've got what looks like a 7 degree angle on them. $45 shipped to your front...

I've followed the guide posted on the CB125S Yahoo Auto group page, and it works really well! The bike is running great on 12V as is. However, the guide says to put 2 x 1Ω 10W resistors in series with the ignition coil. This approximates the resistance from the coil to ground (which I measured...

My '74 CB125S is leaking oil from around the drain plug. The plug is tightened properly according to the torque spec from the manual, the crush washer is there, and it still seems to be leaking. I've cleaned the underside of the crankcase and let it leak for a bit, to make sure it was coming...

I'm having a bit of trouble with my CB125S. The clutch cable is extremely stiff. I've tried replacing the clutch cable, replacing the clutch plates/springs, adjustments at the lever end and clutch end and still haven't been able to fix it. The clutch basket itself is in good shape with no...

I've been having some electrical gremlins with my CB125. I think I've got most of them worked out, and am looking to rewire the bike as the current wiring is a complete shit show. Attached is a wiring diagram I made for how I'd like the bike to be wired. I've placed a 6V regulator before the...

I've got a '73 CB125S and I managed to burn up the clutch in it. Not a big deal, I've already ordered and received all the replacement parts (springs, plates, gasket, oil seal, etc.). I was able to get all but one of the clutch cover bolts out using either an impact driver or vice grips on the...

The bracket for the front looks similar enough. And it just might be dumb enough to work. Anyone done it? Anyone know what the brake rotor diameter is on the 360/400/450?

I think an LDO voltage regulator with a sufficient amp rating to match the USB standard (900ma) and an output voltage of 5V should do the trick. Hook up Vin to the battery positive using a relay and a handlebar switch for the relay, GND to battery GND. Then cut a USB cable, use the red and black...

I just picked up a more or less complete 1980 CB125S for parts. Most everything is already taken off the bike and in a box. If you need anything, send a message.

Hey everyone as the title suggests, I'm new to DTT and I picked up a CB125 today. The idea is to build a very basic cafe racer. As of now the plan is to clean everything really well, then make a fiberglass tail-section and put some of the finest Chinese clip-on handlebars on it. I may CNC some...