[dsn_klr650] chain slack
Posted: Tue Apr 18, 2000 4:40 pm
you are correct about the chain slack changing. i hope i didn't accidentally
give the impression that i thought otherwise. obviously, if it didn't
change, you wouldn't need to have slack. the reason for slack is so that at
some point, as the swingarm goes through it's travel, the chain doesn't get
too tight. chains actually don't need to be slack, they just need to not be
too tight. since most bikes don't pivot at the countershaft, this means a
compromise of sorts.
i believe (someone say something if this is wrong) that the chain is
slackest when the suspension is topped out. assuming this is the case, then
adjusting the slack at any other setting would simply result in a too-loose
chain, which is probably no big deal as long as it stays on. i can't imagine
how it would possibly be better to adjust the chain slacker with more load
on the bike. the swingarm's path remains the same. it is still possible to
use all 9" of travel, regardless of any reasonable load on the bike. as
such, it seems reasonable to me to adjust the chain slack to be the same
under the standard conditions (bike on sidestand, unloaded) no matter what
you plan on putting on it. carrying more weight does not affect the maximum
chain looseness/tightness because it does not affect the limits of the
swingarm movement.
if it were possible to get the chain too tight with the factory slackness
spec, then the factory spec would be different, eh? i aplogize in advance if
anyone finds this too pedantic.
-mark "protractor" weaver
> > As I see it, in order for chain slack to stay constant, the > pivoting radius > would have to stay constant. A constant radius would require > the swingarm > pivot point to be the countershaft sprocket. We all know > that the swingarm is > not attached to the countershaft sprocket and therefore the > radius relative to > the rear wheel changes slightly depending on compression. It > makes sense then > to check chain tension with at least the weight of the bike. > Regards, > -svt- > > >