Look at the 1st pic it has a big 6 bolt reed cage, also look at the clutch cable mount on the cylinder its different, now look above the clutch cable mount between the FINS, can you see the cylinder stud and nut, the head has to be off to get to the back 2 cylinder studs. Now look at 2nd pic do you see the vent tube, its a very tight fit, i had to die grind some off the outside of the cylinder under the reed cage to get the vent tube on. I recommend to put the vent tube on before you put the cylinder on, or get a angle vent adapter. 