Overview Reviews 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 Product Videos Custom Field Product Reviews Write a Review Write a Review × NCY NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *
Quick view Details NCY | sku: 1100-1435 NCY BIG VALVE RACING CYLINDER HEAD (52mm, 88cc) FOR QMB139 MOTORS MSRP: Now: $145.95 Add to Cart Quick view Details GY6 STORE | sku: 99318-N GY6 150cc REBUILD KIT (57mm BORE) FOR SCOOTER ATV KART *54mm SPACING* WITH EGR MSRP: Now: $44.95 Add to Cart Quick view Details GY6 STORE | sku: 87781, 63377 125cc (52.4mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $14.95 Add to Cart Quick view Details GY6 STORE | sku: 99103 150cc (57mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $19.95 Add to Cart Quick view Details GY6 STORE | sku: 99319 GY6 150cc CYLINDER ENGINE KIT WITH NON-EGR HEAD FOR CHINESE SCOOTER MOTORS MSRP: Now: $44.95 Add to Cart
Quick view Details GY6 STORE | sku: 99318-N GY6 150cc REBUILD KIT (57mm BORE) FOR SCOOTER ATV KART *54mm SPACING* WITH EGR MSRP: Now: $44.95 Add to Cart Quick view Details GY6 STORE | sku: 87781, 63377 125cc (52.4mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $14.95 Add to Cart Quick view Details GY6 STORE | sku: 99103 150cc (57mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $19.95 Add to Cart Quick view Details GY6 STORE | sku: 99319 GY6 150cc CYLINDER ENGINE KIT WITH NON-EGR HEAD FOR CHINESE SCOOTER MOTORS MSRP: Now: $44.95 Add to Cart
Quick view Details GY6 STORE | sku: 87781, 63377 125cc (52.4mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $14.95 Add to Cart Quick view Details GY6 STORE | sku: 99103 150cc (57mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $19.95 Add to Cart Quick view Details GY6 STORE | sku: 99319 GY6 150cc CYLINDER ENGINE KIT WITH NON-EGR HEAD FOR CHINESE SCOOTER MOTORS MSRP: Now: $44.95 Add to Cart
Quick view Details GY6 STORE | sku: 99103 150cc (57mm BORE) CYLINDER ENGINE REBUILD KIT FOR GY6 MOTORS MSRP: Now: $19.95 Add to Cart Quick view Details GY6 STORE | sku: 99319 GY6 150cc CYLINDER ENGINE KIT WITH NON-EGR HEAD FOR CHINESE SCOOTER MOTORS MSRP: Now: $44.95 Add to Cart
Quick view Details GY6 STORE | sku: 99319 GY6 150cc CYLINDER ENGINE KIT WITH NON-EGR HEAD FOR CHINESE SCOOTER MOTORS MSRP: Now: $44.95 Add to Cart