potatobroxd Posted March 22, 2019 Share Posted March 22, 2019 (edited) This sound is followed by engine not delivering power (clutched pulled in, meaning engine's rpm doesnt rise) until I blip/twist the throttle again ; if i tried to replicate the sound by blipping numerous times again, i doesnt happen and engine runs and blips like normal. It happens infrequently and randomly when I rev the engine with clutch pulled in; happens on both my brand-new Kawai vulcan 650 AND '16 CB125f (occurs more on the vulcan but could be coincidental that I just happen to rev match downshift more on the vulcan). Sound also seems to occur only when throttle is blipped fast (like a quick blip to downshift) *sound also seems to be coming from the engine, not exhaustI have no idea what it is and whether i signals engine damage? Edited March 22, 2019 by potatobroxd Quote Link to comment Share on other sites More sharing options...
Smithers Posted March 22, 2019 Share Posted March 22, 2019 Unburnt fuel in the exhaust? Or maybe just a blip. Quote Link to comment Share on other sites More sharing options...
Guest Richzx6r Posted March 22, 2019 Share Posted March 22, 2019 Is it not just the exhaust popping on the over run? My ninja pops and bangs like a goodun Quote Link to comment Share on other sites More sharing options...
potatobroxd Posted March 22, 2019 Author Share Posted March 22, 2019 Is it not just the exhaust popping on the over run? My ninja pops and bangs like a goodun Both exhausts are stock and I'm confident the sounds coming from the engine :s Unburnt fuel in the exhaust? Or maybe just a blip. I'm not sure but sound seems to be coming from the engine. The sound occurs more often (or only when, not sure) when I blip the throttle fast enough Quote Link to comment Share on other sites More sharing options...
Guest Richzx6r Posted March 22, 2019 Share Posted March 22, 2019 Without hearing it its difficult to say what it is Quote Link to comment Share on other sites More sharing options...
Gerontious Posted March 22, 2019 Share Posted March 22, 2019 Normal for stock euro4 bikes. Nothing to worry about.My 2018 Africa twin does it and makes me feel like a hooligan. It's a constant subject on the AT forum, they all do it.For the older bike it's likely a small leak in the exhaust, probably and again, nothing to worry about. Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 22, 2019 Share Posted March 22, 2019 Well don't rev your engine with the clutch pulled in then . It's a waste of petrol and you aren't going anywhere. Quote Link to comment Share on other sites More sharing options...
Stu Posted March 22, 2019 Share Posted March 22, 2019 could be the secondary air system Suzuki call it a PAIR valve but they are all the same "> Quote Link to comment Share on other sites More sharing options...
Smithers Posted March 23, 2019 Share Posted March 23, 2019 could be the secondary air system Suzuki call it a PAIR valve but they are all the same "> Thanks for that; that's answered a lot of questions about my Honda which also as a pair valve. Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 23, 2019 Share Posted March 23, 2019 My ER5 pops and bangs on the overrun like a firework display because I've got an open can and no carb modifications. However, since I fitted my "New" engine the popping and banging is considerably reduced and I'm using the same carbs and pipe . I can only conclude that the fact that this engine has better compression and freshly lapped valves means that it burns fuel a bit more efficiently. Still sounds nice though. Quote Link to comment Share on other sites More sharing options...
Guest Richzx6r Posted March 23, 2019 Share Posted March 23, 2019 Cant beat abit of popping and banging Quote Link to comment Share on other sites More sharing options...
skyrider Posted March 23, 2019 Share Posted March 23, 2019 no sounds good Quote Link to comment Share on other sites More sharing options...
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