Backfire on start up - SV650.org

04-06-05, 09:55 AM

Unfortunately I am not the most mechanically minded person so if this is a stupid question I apologise. I have noticed in recent time that on occasion when i start my bike (SV650s K3) it backfires. It only does it once and doesn’t do it at all after first starting up. The bike rides perfectly and has no other problems. Does anyone have any ideas what might be causing this :?:

Biker Biggles · 04-06-05, 10:34 AM

Probably a bit of extra unburnt fuel getting into the inlets just as you start it.My zx9r sometimes does it,as did my old zx6r.Nothing to worry about I think.

04-06-05, 10:41 AM

If you push you bike off then start it it'll often do it. I wheel my bike from the back of my house to the front and she often gives off a cheeky pop.

04-06-05, 10:43 AM

My VTR250 does that too but only when i dont shut off the fuel after my last ride.

TSM · 04-06-05, 11:50 AM

Quote:

Originally Posted by afterburner

My VTR250 does that too but only when i dont shut off the fuel after my last ride.

just for thoes who dont know the sv has an automatic shutoff valve that is opertated by the vac of the engine (on the carbed bikes anyway). So when the bike is not running the fuel is cut off and as soon as it starts it opens again.

06-06-05, 12:44 PM

Mine's done it a couple of times over the past few weeks. Always when I go home from work, and the bike has been standing in the sun all day. It's a 1999.

06-06-05, 02:31 PM

Quote:

Originally Posted by ryancor

Unfortunately I am not the most mechanically minded person so if this is a stupid question I apologise. I have noticed in recent time that on occasion when i start my bike (SV650s K3) it backfires. It only does it once and doesn’t do it at all after first starting up. The bike rides perfectly and has no other problems. Does anyone have any ideas what might be causing this

Its just the PAIR system coming in to play It will do it even more if you have an aftermarket can fitted.
There is a way around this.

06-06-05, 08:50 PM

Quote:

Originally Posted by chewy22

Its just the PAIR system coming in to play It will do it even more if you have an aftermarket can fitted.
There is a way around this.

got a link handy? i remember reading about it before but searching google for Pair +sv650 gives lots of irrelevant answers

10-06-05, 06:46 PM

Quote:

Originally Posted by echomadman

Quote:

Originally Posted by chewy22

Its just the PAIR system coming in to play It will do it even more if you have an aftermarket can fitted.
There is a way around this.

got a link handy? i remember reading about it before but searching google for Pair +sv650 gives lots of irrelevant answers

http://forums.sv650.org/viewtopic.ph...080&highlight=

30-06-05, 01:53 PM

Thanks chaps, sounds as if I've got nothing to worry about other than a few curtain twitchers when I start up in the early hours!! Cheers.

04-06-05, 09:55 AM	#1
ryancor Guest Posts: n/a	Backfire on start up Unfortunately I am not the most mechanically minded person so if this is a stupid question I apologise. I have noticed in recent time that on occasion when i start my bike (SV650s K3) it backfires. It only does it once and doesn’t do it at all after first starting up. The bike rides perfectly and has no other problems. Does anyone have any ideas what might be causing this :?:

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04-06-05, 10:34 AM	#2
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Probably a bit of extra unburnt fuel getting into the inlets just as you start it.My zx9r sometimes does it,as did my old zx6r.Nothing to worry about I think.

04-06-05, 10:41 AM	#3
jon Guest Posts: n/a	If you push you bike off then start it it'll often do it. I wheel my bike from the back of my house to the front and she often gives off a cheeky pop.

04-06-05, 10:43 AM	#4
afterburner Guest Posts: n/a	My VTR250 does that too but only when i dont shut off the fuel after my last ride.

06-06-05, 12:44 PM	#6
iprideaux Guest Posts: n/a	Mine's done it a couple of times over the past few weeks. Always when I go home from work, and the bike has been standing in the sun all day. It's a 1999.

30-06-05, 01:53 PM	#10
ryancor Guest Posts: n/a	Thanks chaps, sounds as if I've got nothing to worry about other than a few curtain twitchers when I start up in the early hours!! Cheers.