I have a 150cc chinese dirt bike that is leaking oil. The oil is coming from- in front of the front sprocket...there is an oblong plastic piece that has a wire connected to it...I wish I had a diagram so I could name the part. Anyway, it appears that there is an O-ring inside. I am going to replace the o ring to see if that stops the leak. In the meantime, any suggestions...or does anyone know what this part is called? Thanks, troutdude.