mrs72's scooter won't start now that I "fixed" it. it's a '06 Yamaha Vino 125 with a Mikuni BS26 (stock-ish) carb that was running fine before I messed with it. I replaced the float needle and reset the float height to 17mm, also removed the pilot jet and ran a wire through it, put it back. I also replaced the air filter, stock paper filter was mega clogged, I put in a UNI drop-in foam filter.
Here's what it's doing:
It cranks and won't start when fully assembled.
If I pull the airbox off, I can get it to fire if I put my hand over the carb inlet for like 1/2 second while it's cranking, which BTW splashes fuel out the carb. It will fire for a second and I can even keep it running for a few seconds if I get it to fire then take my hand away.
There are no specs for the pilot mixture setting. I set it by trial and error and feel, riding it on the road with it fully warmed up. I had it 4.5 turns out, which is where it is now. I did try tinkering with this thinking maybe it was too lean.
Anyway, can someone with more real world experience with small singles carbs offer some help here? I'm sure I did something wrong when I had it apart but I don't know where to look.
Here's what it's doing:
It cranks and won't start when fully assembled.
If I pull the airbox off, I can get it to fire if I put my hand over the carb inlet for like 1/2 second while it's cranking, which BTW splashes fuel out the carb. It will fire for a second and I can even keep it running for a few seconds if I get it to fire then take my hand away.
There are no specs for the pilot mixture setting. I set it by trial and error and feel, riding it on the road with it fully warmed up. I had it 4.5 turns out, which is where it is now. I did try tinkering with this thinking maybe it was too lean.
Anyway, can someone with more real world experience with small singles carbs offer some help here? I'm sure I did something wrong when I had it apart but I don't know where to look.