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I'm working on my 1967/68 YCS1c -- It's a 180cc twin, 2 stroke. Have the heads/cylinders off and need to order new pistons and rings. Build thread here. Can anyone tell me what these numbers indicate? RH Piston - 597 on top and 5050 on bottom. On inside -- IZUMI 8 LH Piston - 5degrees on...

Bike is in 8/10 shape -- everything is complete and it's been in 1 family since new. Hasn't started in 3 years but was running fine when it was parked. Stored indoors. A real survivor. I can pick it up for $800. Good price/deal?

I've made a pretty big mess of things. This is a 1968 Yamaha YCS1. The stock wiring harness appears to be intact but the ignition switch that I have is a mystery. The ignition switch is 6 wires (IG/HL/C2/C/S3/SE). My wiring diagram shows 5 wires connected to the switch (B/C/T/L/A). I'm...

I've got a thread in the project forum but thought I might be able to get more specific help here.... Trying to figure out what jets/needles and rebuild gaskets I need to order for these carbs. Can't for the life of me figure out what mikuni they are (they don't match up to any of the mikuni...

Hey guys -- I started over in the member introduction section but thought I'd locate it closer to where it should be. This is my first vintage motorcycle project so be patient as I describe things. I picked this little 2-stroke up off of craigslist for what I thought was a very fair price...

Hey Guys -- Just wanted to drop a quick introduction since I'm sure I'll be hitting up this forum for help and assistance as I start on my new build. I've owned motorcycles since I turned 18 but this is my first foray into something truly "vintage." I've ridden track days around the midwest on...