Valve Lash effects

[Micke68]

I read in an older thread that having the valves adjusted too tightly will cause a drop in power, but what is the effect of having the adjustments too loose? My intake valve lash is between .007-.008 on all of the valves, will this decrease power as well? What about on the exhaust valves? I know that back in our bando days guys would set the valve lash tighter for longer tracks to gain top end power and wider for shorter tracks for low end power. Does this same methodology apply to the legends engine also?

[justfreaky]

Don't know if this will help you, I found the info on a bike forum.


Changing the clearance will effect the timing slightly, tighter will advance, looser will retard. It will also effect the lift, tighter =more, looser = less. It may effect duration the same way, tighter= longer, looser = shorter.
Will the average rider on the average bike notice these minor changes, I doubt it. On a highly tuned racer with a highly tuned rider then maybe.


Steve