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Bikes, Hints'n'Tips => FZS600 Fazer => Topic started by: Val on 27 February 2016, 01:36:45 pm

Title: Backfire
Post by: Val on 27 February 2016, 01:36:45 pm

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?

Title: Re: Backfire
Post by: Brettholmes89 on 27 February 2016, 04:18:51 pm

Is it back firing just on tickover? Mine back fires if I've been giving it some beans then roll the throttle off

Title: Re: Backfire
Post by: Val on 28 February 2016, 02:13:46 am

Quote from: Brettholmes89 on 27 February 2016, 04:18:51 pm

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.

Title: Re: Backfire
Post by: Brettholmes89 on 28 February 2016, 08:54:00 am

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

Title: Re: Backfire
Post by: His Dudeness on 28 February 2016, 08:26:21 pm

Only happens on warm up? Does it only happen with the choke on?

Title: Re: Backfire
Post by: Jamieg285 on 29 February 2016, 12:17:36 pm

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.

Title: Re: Backfire
Post by: Frosties on 29 February 2016, 12:42:48 pm

May just be a bit of condensation in the exhaust Val - just a thought.

Title: Re: Backfire
Post by: darrsi on 29 February 2016, 12:54:42 pm

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.

Title: Re: Backfire
Post by: Val on 29 February 2016, 08:29:02 pm

Quote from: His Dudeness on 28 February 2016, 08:26:21 pm

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.

Quote from: Jamieg285 on 29 February 2016, 12:17:36 pm

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

Title: Re: Backfire
Post by: darrsi on 29 February 2016, 08:33:43 pm

Surely a carb balance would actually help to even things out?