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never seen that before
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A recently-installed chain on the Tuono is whipping... sideways.
How did I find out? Well it's /just/ clipping the edge of the tyre,
fortunately just on the edge of the treads.There's a series of shallow
nibbles all round the tyre. Normal chain run is quite close to the
tyre, about 3-4mm, but I have to push the chain quite firmly across to
make it contact the tyre.
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My GSXR1100 is like that. It was close when new and rubs now.
My guess is that a modern Dunlop 180/55 tyre is a bit wider than
a 1990 Michelin 180/55. Perhaps I'll try a 170/60 next time.
Or I could offset the sprockets by turning the front sprocket over
and shimming the rear.
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It ain't a bent back sprocket, for two reasons: the nibbles are all
round the tyre, not just one area, and I've checked the sprocket by
holding a pointer against the swing arm, that just brushes the
sprocket: it's even all the way round.
I haven't checked the front sprocket specifically for trueness but it
would have to be seriously bent to have this effect, and looked fine
when I installed it. It's a substantial machined item made by Renthal
with a wide splined hub - I doubt the problem's there.
I've double and triple checked the assembly against the Aprilia
workshop manual (strictly the RSV Mille one): it's correct. It's
impossible to get the left & right spacers wrong as they're identical.
I've double-checked the wheel alignment, that seems to be pretty much
spot on.
If I look along the chain line and spin the rear wheel then the chain
appears to snake slightly. At present the chain, a heavy-duty X-ring
jobbie, a Japanese make I've never heard of before (and can't remember
now), is the prime suspect.
Apart from this issue and a minor niggle with the LH mirror folding
back under hard acceleration above 70mph or so, the Tuono is huge,
huge, HUGE fun to ride.
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