Product Description
52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY
FOR 50cc OR LARGER QMB139 ENGINES
50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET.
KIT INCLUDES CYLINDER, PISTON,
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 ENGINE DAMAGE.
*YOU MAY NEED TO MODIFY YOUR ENGINE CASE TO ACCOMMODATE THE LARGER CYLINDER.
UPGRADES TO 87.9cc
CYLINDER BORE: 52mm
CYLINDER SLEEVE OUTER DIAMETER: 54.8mm
WRIST PIN DIAMETER: 13mm
TOTAL PISTON HEIGHT: 34.8mm
COMPRESSION HEIGHT (FROM CENTER OF WRIST PIN HOLE TO TOP EDGE OF PISTON): 17.25mm
