Exhaust Sucking in Air
Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
Burnt exhaust valve
Bad head gasket
timing
Changed cams lately by chance?
Bad head gasket
timing
Changed cams lately by chance?
Ultimate HDF Member
Joined: Jul 2014
Posts: 5,649
Likes: 430
From: MASS_hole
You running with straight pipes perhaps? If so, you may have a burned up or seized exhaust valve that isn't plugging up and letting air in.
Does it do this even if you blip the throttle before shutting the ignition?
Does it do this even if you blip the throttle before shutting the ignition?
Banned
Joined: Jun 2014
Posts: 564
Likes: 4
From: Charleston, SC
If you're referring to that brief "fweet" noise when you shut the bike off, it's harmless. Mine does it quite a bit, depending on what stroke the bike is in when I turn it off. I believe it is air being sucked into the air cleaner as one of the pistons drops. I could be wrong about this; maybe someone who knows a bit more will chime in.
If you're referring to that brief "fweet" noise when you shut the bike off, it's harmless. Mine does it quite a bit, depending on what stroke the bike is in when I turn it off. I believe it is air being sucked into the air cleaner as one of the pistons drops. I could be wrong about this; maybe someone who knows a bit more will chime in.
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