Topic: Polishing Piston Tops

[martino1972]

i wouldnt polish them,let the crank settle itself in the way it wants too,just use lots of assembly grease on the journals...

[scondon]

 Bearings have a coating on them to prevent wear during installation/ initial start-up. Leave 'em be is my guess.

[rbmgf7]

i figured the bearings were left satin-like to create a no slip boundary between the layer of oil and crankshaft. looking at the crankshaft, the "races" (not sure of a correct term) are polished to almost a mirror like finish which helps glide across the layer of oil. IMO

[heffay]

I've never specifically polished piston tops or cylinder domes to a hi gloss... only to remove excess carbon buildup.
as soon as those plugs start firing again i know its all over for those highly polished surfaces.   

now, if i was building a bike for a single drag race... i would polish the crap out of the domes, piston tops and my skull.   

heres the extent of my usual work that i consider to be in the "tune up" category... i think it just makes for a sudden revival to the motor's spunk...

3 before and 1 after


after


1 piston top partially cleaned and 1 complete


hey Gordon... what does Manuelle say?