JJs80XS
XS650 Member
Hi xs650 geniuses,
1980 xs650SG. It's been surging randomly and also won't come down from high rpms. Something interesting I've noticed is that when I pull either the left or the right sparkplug cap and make the bike run on only one cylinder it will idle nicely without surging, and as soon as both sparkplug caps are on (i.e., it is running on both cylinders) it surges, even after I turn the idle screw out. Same with the hanging high rpms: it won't hang high if it's only running on one cylinder, but as soon as both are going, it won't return to idle.
Thoughts? Thanks!
1980 xs650SG. It's been surging randomly and also won't come down from high rpms. Something interesting I've noticed is that when I pull either the left or the right sparkplug cap and make the bike run on only one cylinder it will idle nicely without surging, and as soon as both sparkplug caps are on (i.e., it is running on both cylinders) it surges, even after I turn the idle screw out. Same with the hanging high rpms: it won't hang high if it's only running on one cylinder, but as soon as both are going, it won't return to idle.
Thoughts? Thanks!
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