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+--- Thread: Backfire (/showthread.php?tid=75053)
Backfire - Val - 27-02-16
My Fazer lately has started to backfire when cold in the morning. Not always but sometimes
Do I need to do some servicing?
It has new Iridium spark plugs.
I have the feeling all started after I have changed my old air filter with new K&N.
Any ideas?
Re: Backfire - Brettholmes89 - 27-02-16
Is it back firing just on tickover? Mine back fires if I've been giving it some beans then roll the throttle off
Re: Backfire - Val - 28-02-16
(27-02-16, 05:18 PM)Brettholmes89 link Wrote: Is it back firing just on tickover? Mine back fires if I've been giving it some beans then roll the throttle off
Only when starting in cold.
Re: Backfire - Brettholmes89 - 28-02-16
I know it's a car thread but the principles are the same.
Worth trying them.
http://www.viva-lancia.com/fulvia/qanda/engine/backfiring.php
Re: Backfire - His Dudeness - 28-02-16
Only happens on warm up? Does it only happen with the choke on?
Re: Backfire - Jamieg285 - 29-02-16
If you've just changed the plugs it could have significantly changed the spark/fire characteristics, meaning you don't need as much choke angle/duration as you are used to.
I've recently changed my for the first time since owning the bike. Before the change I needed choke on for a couple of miles before I could take it off and not stall. With new plugs I can take it off after a couple of hundred yards.
Re: Backfire - Frosties - 29-02-16
May just be a bit of condensation in the exhaust Val - just a thought.
Re: Backfire - darrsi - 29-02-16
Mine did it the other day inside my shed, and made me bloody jump, but i now realise it was probably connected to my side stand switch issues, so was just over fuelling because it didn't wanna start with the side stand down for whatever reason.
Re: Backfire - Val - 29-02-16
(28-02-16, 09:26 PM)His Dudeness link Wrote: Only happens on warm up? Does it only happen with the choke on?
Yes only on warm up when on choke only. I do twist a nudge of throttle when starting on choke. I know it is recomended not to use any throttle when on choke, but if I not use at least a little throttle the bike can't start.
(29-02-16, 01:17 PM)Jamieg285 link Wrote: If you've just changed the plugs it could have significantly changed the spark/fire characteristics, meaning you don't need as much choke angle/duration as you are used to.
I've recently changed my for the first time since owning the bike. Before the change I needed choke on for a couple of miles before I could take it off and not stall. With new plugs I can take it off after a couple of hundred yards.
Actually I have changed the plugs some time ago last year and it was working fine. The whole backfire started after the K&N filter.
I will buy soon OEM filter and will see what happens next :lol
Re: Backfire - darrsi - 29-02-16
Surely a carb balance would actually help to even things out?