strange backfire - SV650.org

11-06-09, 01:54 PM

hi all, i have a 2000 sv650s recently purchased..dont know why i waited so long.
occasionally i seem to be getting a missing/backfire from the carbs? is this due to an air leak? or is it just a characteristic of the bike, it is only very occasional. as i have not long had bike and two small children i have not had the time to have a poke about and see what kind of tinkering has been done .

11-06-09, 02:50 PM

does it happen when you roll off the throttle at around 3-4k if so thats normal

11-06-09, 02:59 PM

it does it when i am at about 3-4 grand but putting throttle on, like i say only occasionally. it has a scorpion can on it so maybe jetting issue?

11-06-09, 06:42 PM

Mine backfires a little under closed throttle on the over-run, normal as they all seem to do it. Adds to character.

Maybe get it rejetted/dynojetted and see.

appollo1 · 11-06-09, 07:34 PM

mine does it as well and always brings a wee grin to my face when it happens.

12-06-09, 01:01 AM

Do the revs drop when it backfires and then pick up shortly after?
Sounds like an electrical problem. My bike has an intermittent fault similar to yours, but it's much more violent

Check for any chafing of the loom against the frame. Common areas are headstock and under the rear fairing pannel on the left hand side. Also check your sidestand switch and kill switch are working properly.

12-06-09, 07:43 AM

cheers all, will investigate inside and see if there are any sparky things going on, like i say its very occasional, so if nothing obvious will just have to live with it!

12-06-09, 12:20 PM

Mine used to misfire now and again. Could hear a pop from under the tank.
Ran great until I sold it. Plugs always looked fine too.
It might have been and air leak somewhere near the carbs/airbox

13-06-09, 07:01 AM

cheers vardypeeps, the popping from under tank is definately there, as for the flame out of the exhaust. mahoosive! singed my wheelie bin.looks like some investigating when i get day of peace from small people and wife(paint the fence.stain the decking. when are you going to hang that picture.daddy can you build me a ben ten playhouse and take me to the park.etc)

13-06-09, 02:02 PM

Quote:

Originally Posted by demonicus

(paint the fence.stain the decking. when are you going to hang that picture.daddy can you build me a ben ten playhouse and take me to the park.etc)

What, you're saying you still can't get it done?!

11-06-09, 01:54 PM	#1
demonicus Guest Posts: n/a	strange backfire hi all, i have a 2000 sv650s recently purchased..dont know why i waited so long. occasionally i seem to be getting a missing/backfire from the carbs? is this due to an air leak? or is it just a characteristic of the bike, it is only very occasional. as i have not long had bike and two small children i have not had the time to have a poke about and see what kind of tinkering has been done .

11-06-09, 02:50 PM	#2
silent11 Guest Posts: n/a	Re: strange backfire does it happen when you roll off the throttle at around 3-4k if so thats normal

11-06-09, 02:59 PM	#3
demonicus Guest Posts: n/a	Re: strange backfire it does it when i am at about 3-4 grand but putting throttle on, like i say only occasionally. it has a scorpion can on it so maybe jetting issue?

11-06-09, 06:42 PM	#4
Jamiebridges123 Guest Posts: n/a	Re: strange backfire Mine backfires a little under closed throttle on the over-run, normal as they all seem to do it. Adds to character. Maybe get it rejetted/dynojetted and see.

11-06-09, 07:34 PM	#5
appollo1 Member Mega Poster Join Date: Apr 2008 Location: Newport on Tay Posts: 1,017	Re: strange backfire mine does it as well and always brings a wee grin to my face when it happens. __________________ i'm not old i'm experienced!! http://www.german-shepherd-rescue-scotland.org.uk/ everyone deserves a second chance RIP Appollo miss you and will always love you x x x x

12-06-09, 01:01 AM	#6
joshmac Guest Posts: n/a	Re: strange backfire Do the revs drop when it backfires and then pick up shortly after? Sounds like an electrical problem. My bike has an intermittent fault similar to yours, but it's much more violent Check for any chafing of the loom against the frame. Common areas are headstock and under the rear fairing pannel on the left hand side. Also check your sidestand switch and kill switch are working properly.

12-06-09, 07:43 AM	#7
demonicus Guest Posts: n/a	Re: strange backfire cheers all, will investigate inside and see if there are any sparky things going on, like i say its very occasional, so if nothing obvious will just have to live with it!

12-06-09, 12:20 PM	#8
vardypeeps Guest Posts: n/a	Re: strange backfire Mine used to misfire now and again. Could hear a pop from under the tank. Ran great until I sold it. Plugs always looked fine too. It might have been and air leak somewhere near the carbs/airbox

13-06-09, 07:01 AM	#9
demonicus Guest Posts: n/a	Re: strange backfire cheers vardypeeps, the popping from under tank is definately there, as for the flame out of the exhaust. mahoosive! singed my wheelie bin.looks like some investigating when i get day of peace from small people and wife(paint the fence.stain the decking. when are you going to hang that picture.daddy can you build me a ben ten playhouse and take me to the park.etc)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
backfire!	vardypeeps	SV Talk, Tuning & Tweaking	7	21-08-08 12:01 PM
This morning..(backfire ?)	Alpinestarhero	SV Talk, Tuning & Tweaking	15	22-04-07 05:59 PM
exhaust backfire???	james160987	SV Talk, Tuning & Tweaking	7	19-05-06 09:46 PM
Backfire(ing) on purpose!	bobit69	Bikes - Talk & Issues	43	07-06-05 01:13 PM
normal backfire	TSM	Bikes - Talk & Issues	20	27-02-05 08:14 PM