52mm BORE / 88cc NCY BIG BORE CYLINDER KIT FOR QMB139 50cc ENGINES

  

52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY. FOR 50cc OR LARGER QMB139 ENGINES. 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. RINGS, PISTON PIN, CIR CLIPS, HEAD GASKET, AND BASE GASKET. WHEN YOU USE THIS SSP-G 52mm BIG BORE CYLINDER SET IN CONJUNCTION WITH OUR 44MM STROKER CRANKSHAFT.

(SEE RELATED ITEMS) YOU WILL INCREASE YOUR TOTAL DISPLACEMENT TO 93.4CC, ALMOST DOUBLING YOUR ORIGINAL DISPLACEMENT!! WE RECOMMEND THAT YOU USE OUR QMB139 PERFORMANCE CYLINDER. HEAD WITH THIS SET AS SOME STOCK CYLINDER HEADS WILL NOT FIT. USE WITH AN UN-MODIFIED STOCK HEAD CAN CAUSE SERIOUS. YOU MAY NEED TO MODIFY YOUR ENGINE CASE TO.

CYLINDER SLEEVE OUTER DIAMETER: 54.8mm. TOTAL PISTON HEIGHT: 34.8mm.

COMPRESSION HEIGHT FROM CENTER OF WRIST PIN HOLE. TO TOP EDGE OF PISTON: 17.25mm.