window piston set, e-clip installation methods please reference video. 
 · this piston set fits on longer connecting rod only;
· this piston set is for the 80cc or 66cc motor
   · 47mm piston set inlcuding 1 high hole window piston 47mm, 2 piston rings 2mm thick,1 piston pin 10mm diameter and 2 clips for your new cylinder build or as replacements.
  
   · DOSE NOT WORK WITH stocked manifold intake,Buyers must use high performance intake;
 
 
Product description
1. Good performnace with high performance air intake and carburetor. 
2. Please note that this piston set fits on longer connecting rod only; work only with better performance manifold intake such as G2 reed,dio reed etc and better performance carburetor such as RT carburetor, CNS carburetor or other ones.
3. The windowed 66cc piston kit is only for 80cc/66cc engine kits.