For early model fork dampers that have holes below the conical section at the bottom of the damper.  Later models with holes in the middle of the conical section or just above the conical section do not need these bottom sleeves.  Be sure to add the top sleeves to eliminate top out clunk. More info on aluminum sleeves.

This shape is taken from the world famous Harley XR 750 flat tracker. The intake port floor is raised for increased velocity and flow, allowing for a fuller intake charge. Made of alum. An easy drop in kit but some raised porting at 10:00 and 2:00 near the guide may be required for increased performance (see instructions).  Add a dab of JB weld to hold it securely - align with valve guide and tilt into place.  Two reusable teflon heat insulating gaskets included (more images) (installation instructions).

Makes installation and removal easy without damaging the collars.

Just slide this viton Oring on beside the crank main seal before you install the engine sprocket (chain or belt).  There should be nearly zero side clearance and that will prevent the main seal from inverting due to wet sumping (hydraulic force from too much oil in the sump).  This is the only real problem due to wet sumping and the Oring solves it.  Its cheap insurance and it beats oil shut off valves that can blow up your motor (see installed image).