2003 Yamaha Vino 50 Crank Bearing Replacement

[msiger919]

Originally Posted by sc00ter

The casting name marks are throwing me off. What is the VIN # and were is it stamped on the motor? also a pic of the scooter it came out of. Only saying because if its a clone motor, no matter how well cloned, something weird sized will sneak up and bite ya in the butt!

Def not a clone, it is a bonafide 2003 Yamaha Vino 50. I think my posts are getting confused. I have a Chinese Jalon post I am working on as well.

[sc00ter]

Ok, I was confused and didnt want you buying something that would not fit. My friend built the baddest Vino 2 stroke ever. I can try to get some info from him when i see him.

[msiger919]

Originally Posted by sc00ter

Ok, I was confused and didnt want you buying something that would not fit. My friend built the baddest Vino 2 stroke ever. I can try to get some info from him when i see him.

Sc00ter, flywheel puller came in last night. I split the case, the crank came apart, but both halves are still in their respective case halves. Do I need to press them out? I have a hydraulic press. For now I just want to put this thing back on the road stock. Wife wants a scoot for the summer, not going to put her on something I have modded.

[sc00ter]

That sounds weird and interesting! So, the crank split in half... I would press them out I guess, as I have never seen that happen before. Note that the bearings will (should) stay on the crank arms and they cannot be reused, no matter if you get them off and they spin smooth. We can usually reuse the old crank if needed when we split motors. So, press the crank halves out? What crank are you getting to replace it? Going stock or a slight upgrade? A upgraded crank cost a bit more and gives you the worry free option if you ever go with a bbk in the future. What sucks is we recycle the old, stock cranks after removing them. Have zero interest in stock motors.

[msiger919]

Originally Posted by sc00ter

That sounds weird and interesting! So, the crank split in half... I would press them out I guess, as I have never seen that happen before. Note that the bearings will (should) stay on the crank arms and they cannot be reused, no matter if you get them off and they spin smooth. We can usually reuse the old crank if needed when we split motors. So, press the crank halves out? What crank are you getting to replace it? Going stock or a slight upgrade? A upgraded crank cost a bit more and gives you the worry free option if you ever go with a bbk in the future. What sucks is we recycle the old, stock cranks after removing them. Have zero interest in stock motors.

This thing was abused. I think they ran it quite a while with bad bearings. Both sides were bad. I could wiggle both the clutch shaft and magneto side. Pull on the connecting rod and you could see the crank shaft moving as well. Piston was a little scored also, but cylinder looks to be OK, cast iron I believe. I am just going to put it back to stock. If I am going to mod something it is going to be an older Zuma, like those scoots.