169cc EFI engine mods

[Ben1386]

So I have a new Trailmaster Blazer 4 200EX with a 169cc EFI engine. I've heard that 150cc parts don't work on this particular engine due to stud spacing. Does anyone have experience with this? Anybody kn
ow of available mods (BBK, cam, etc)?

[BEEFKING69]

Its already got a bbk from the factory. These are whats called the K-block motors. A-block is the older gy6s...gy6B has the bigger spacing and different crank and different cvt.....B-block is a custom case with the gy6b spacing in an A-block case....K-block has the gy6B crank and variator with a 5mm smaller rear pulley and different belt. K-block has the gy6B and B-block stud spacing but the two smaller bolts on the side are spaced diffenetly so the B stuff wont work.

Does your manual have a parts list with part numbers in it?