3 piece crank installation

Discussion in 'Bicycle Repair' started by Andrew S, Jul 6, 2012.

  1. Andrew S

    Andrew S New Member


    I'm putting together a 49cc skyhawk on a Sun Atlas frame. I'm installing the 3 piece wide crankset that came with the engine kit. There is no clear diagram explaining how exactly the pieces go together. I don't want to screw this up, so can anyone give me a diagram?


    Andrew S

  2. Barry

    Barry Member

    Hello Andrew,
    Of my last two builds, I've had to install and adapter due to having a size large crank housing (see pics) Once you've got that, installed the crank set should go in fine for you.
    (brthornton@yahoo.com) crank adapter 1.JPG Crank adapter 2.JPG
  3. Andrew S

    Andrew S New Member

    Hi, Barry, thanks for your reply. I knocked out the old bushings and installed the adaptor, no problem. What I needed was to know the exact positions of the bearing cups and bearings, but I think I figured it out. I'll just have to test ride it to be sure.
    Andrew S.