Yes it is a way to change your gz250 to a300cc

[perroloco]

I was checking a web side http://www.loncin.ca/schematic-list.aspx?ModelID=10 they have a 300cc actually a 292cc that is the same than the gz250 the only difference after checking the parts number is the part number on the camshaft the 300cc is 12711-38202 the Gz 250 is 12711-13foo and the cylinder head assembly 300 cc is11111-38204 and the 250 is11100-25do2 other wise piston, jug, valves, gaskets, timing chain, etc.etc they are all the same just check the web side and check the parts numbers and compare I have that atv and the eng have the Suzuki logo on the eng cover just like the GZ 250 but is a 300 (292) and you can feel the diference when you open it up probably the cam is more for torke than speed so probably you could interchange the camshaft the camshaft sproket is the same on the 250 and 300 :2tup: