Look for signs of wear and possible damage inside the cylinder. In most cases (such as this one) you won’t need to hone
the cylinder. If you see a lot of wear or scratches, you might
need a mechanic or machinist with a hone to look it over. Not
changing oil frequently enough and sucking dirt can contribute to excessive cylinder wear.
Fit a rag underneath the piston before you remove the pin to
prevent any small parts from falling into the bowels of your
engine. The same goes for reassembly. Fishing a stray circlip
out of the bottom end is no fun!
When removing the stock cam chain, you will need a flywheel
puller. After removing the flywheel, you need to remove the
cam-chain retainer that keeps it in place on the crankshaft
gear. When reinstalling, make sure to use Red Loctite and
torque to OEM spec.
Run the cam chain over your finger to check for wear, making sure all links are still moving smoothly. Not everyone is in
the habit of replacing the cam chain during a top-end job, but
Vertex now offers an incentive: a Hot Cams cam chain with
every new Vertex top-end piston kit. Treat your ride to some
added security at no extra charge!
Using a good assembly lube on the ring lands, wrist pin, cylinder walls and camshaft journals is important for initial startup.
We used Klotz TechniPlate Synthetic.
The black square on the new Vertex piston is molybdenum disulphide (MOS2, aka moly coating) coating, which is
designed to reduce wear. As evidenced by the skirt wear on
the stock piston, this patch of dry film lubricant is exactly
where it needs to be.