The Honda 250 parts won't fit the Blaster unless you happen to have a BBK cylinder made by LA Sleeve, also sold by CT Racing. The Honda's mount with 6 bolts, the Blaster of course only 4. I know of 2 styles the Honda used on the 250cc engines from the early 80's on. The early ones had bolts on the corners and an extra set between on the top and bottom. The later ones had 6 bolts (sometime around 2000), one on each side and 2 on the top and bottom, none in the corners.