Cylinder Barrel Kit: KTM SX50 SX 50 AC (2000-2009) Honda CBF600 then this could be the

then this could be the solution

Please check as some YZ models are 80mm

2 Brand New ignition coils to fit:

Kawasaki KX 250 F1 (1988)

4KJ-82310-00 & 3KJ-82310-10 on a Yamaha EW50 slider for the years shown above

Cylinder Barrel Kit: KTM SX50 SX 50 AC (2000-2009) Honda CBF600 then this could be theBrand new Cylinder Barrel Top End Rebuild kit to fit: KTM SX 50 Junior (2000 2001) & (2006 2009). KTM SX 50 Pro Junior (2000 2001). KTM SX 50 Senior (2000 2001). KTM SX 50 Pro Senior (2000 2001). This is the highest quality aftermarket KTM SX50 cylinder kit you can get on the market. This kit comes with everything you'll need to completely rebuild the top end on your Air Cooled SX50 using the S6S engine. Includes Cylinder, Gasket, Piston Kit, Cylinder