Backfiring over bumps - SV650.org

08-07-10, 08:53 AM

Hi Folks

recently the sv has been having backfires when i go over reasonably big bumps in the road. it seems to only happen when the revs are up (6k and over). I've gone over the bumps in a higher gear at lower revs and no backfire occurs.

Connections to the battery and plugs seem nice and tight and I have no idea what else could be causing the problem.

anyone got any suggestions? scaring the tourists in central london with backfires is all good fun but I would prefer not to do it.

yorkie_chris · 08-07-10, 09:03 AM

Bypass the sidestand switch is a good start

ixlr8 · 09-07-10, 06:30 AM

Trouble with bypassing the sidestand switch is if you forget, the stand won't fold when you turn left. Forget it just once and you could well be dead. Not good outcome.

Things to look for are inadequate lubrication of sidestand so it doesn't return enough or, on older bikes, weakened springs, such as on mine.

09-07-10, 06:54 AM

Replace the 2 sidestand springs , this is what i did and it cured the problem.

yorkie_chris · 09-07-10, 08:47 AM

Quote:

Originally Posted by ixlr8

Trouble with bypassing the sidestand switch is if you forget, the stand won't fold when you turn left. Forget it just once and you could well be dead. Not good outcome.

Things to look for are inadequate lubrication of sidestand so it doesn't return enough or, on older bikes, weakened springs, such as on mine.

Well in the majority of cases you'll just fall over and look a c**t... once you've done that once you won't do it again!

ophic · 09-07-10, 09:06 AM

Just to make sure it's that, I'd be tempted to tie the sidestand up then go for a bumpy ride.

flymo · 09-07-10, 09:35 AM

take a good look at the connections in and around the bike on/off switchgear, particularly where the switchgear connects to the wiring loom just behind the headstock (you'll likely need to remove the airbox or pull the radiator forwards to get to this)

09-07-10, 04:29 PM

thanks folks

will give those suggestions a go. will ride it next week sometime as laid up on crutches right now

mikerj · 09-07-10, 07:26 PM

Quote:

Originally Posted by emcf

thanks folks

will give those suggestions a go. will ride it next week sometime as laid up on crutches right now

Hopefully not as a result of leaving the sidestand down!

09-07-10, 10:03 PM

Quote:

Originally Posted by mikerj

Hopefully not as a result of leaving the sidestand down!

lol no! old age and rugby training combining to give me a torn calf muscle.

08-07-10, 08:53 AM	#1
emcf Guest Posts: n/a	Backfiring over bumps Hi Folks recently the sv has been having backfires when i go over reasonably big bumps in the road. it seems to only happen when the revs are up (6k and over). I've gone over the bumps in a higher gear at lower revs and no backfire occurs. Connections to the battery and plugs seem nice and tight and I have no idea what else could be causing the problem. anyone got any suggestions? scaring the tourists in central london with backfires is all good fun but I would prefer not to do it.

08-07-10, 09:03 AM	#2
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Backfiring over bumps Bypass the sidestand switch is a good start __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

09-07-10, 06:30 AM	#3
ixlr8 Member Join Date: Jul 2003 Location: Melbourne, Australia Posts: 117	Re: Backfiring over bumps Trouble with bypassing the sidestand switch is if you forget, the stand won't fold when you turn left. Forget it just once and you could well be dead. Not good outcome. Things to look for are inadequate lubrication of sidestand so it doesn't return enough or, on older bikes, weakened springs, such as on mine.

09-07-10, 06:54 AM	#4
TheShadow Guest Posts: n/a	Re: Backfiring over bumps Replace the 2 sidestand springs , this is what i did and it cured the problem.

09-07-10, 09:06 AM	#6
ophic Member Mega Poster Join Date: Jan 2004 Location: Whyteleafe Posts: 3,395	Re: Backfiring over bumps Just to make sure it's that, I'd be tempted to tie the sidestand up then go for a bumpy ride. __________________ Silver SV650SK3, Fuel exhaust

09-07-10, 09:35 AM	#7
flymo Member Mega Poster Join Date: Jan 2008 Location: North West Posts: 3,124	Re: Backfiring over bumps take a good look at the connections in and around the bike on/off switchgear, particularly where the switchgear connects to the wiring loom just behind the headstock (you'll likely need to remove the airbox or pull the radiator forwards to get to this)

09-07-10, 04:29 PM	#8
emcf Guest Posts: n/a	Re: Backfiring over bumps thanks folks will give those suggestions a go. will ride it next week sometime as laid up on crutches right now

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