Hi All. Google's not helping today - can anybody list the general effects of an exhaust leak, in my case (in both my cases) the SR500 and GR650 are leaking at the join between the header and muffler. I know backfiring is one effect, because of the fresh air getting sucked in, and yesterday the GR was backfiring terribly and not starting. It also fouled its plugs, as does the SR regularly (though GR = oil* and / or petrol fouled, SR = carbon). Just exploring what contribution this leak might be making to other issues on the bikes... Thanks, Matt (*I know the reason for this - a twice-removed previous owner who perchance is an SR500 Club member, rebuilt the engine, said it's fine inside, except he bodged the valve seals).