THIS IS A TOP QUALITY HEAD FULLY ASSEMBLED WITH ALL NEW LIFAN PARTS. THIS WILL FIT THE FOLLOWING STOCK ENGINES: Z50R'S 1992 THRU 1999 ALL YEARS OF XR50'S ALL YEARS OF CRF50'S ALL LIFAN 50'S ____________________________________________________ THE DOME ON THIS HEAD WILL NOT MATCH THE PISTONS ON OLDER HONDA MODELS, SORRY 1P39FMB/290L$64.99 CLICK ON PICTURE TO SEE BIGGER CLICK ON PICTURE TO SEE BIGGER CLICK ON PICTURE TO SEE BIGGER CLICK ON PICTURE TO SEE BIGGER XR50_CRF50 Z50R_Z50A 50CC_39MM_BORE HEAD_GASKET (SOLD_EACH) (291C)WORKS ON ALL HONDA AND LIFAN 50'S WITH THE 39MM X 41.4 BORE AND STROKE 291C$3.99