Barbling and backfiring - SV650.org

17-12-06, 12:29 PM

I have a 2001 650s and the bike has developed this 'condition' over the past few months. Acceleration is ok although I am sure I can here air being drawn in. When I let the revs off it pops and bangs like a goodun, it doesn't always backfire but always grumbles. I have removed the exhaust and have found a very fine 20mm crack in the lower pipe gasket. Is that enough to cause this problem??? Have also removed the tank and checked around carbs but didn't find anything obvious. This is really annoying and as much as the twins do grumble as you slow I had 15 months of nothing so it must be fixable. Help me please!

TSM · 17-12-06, 12:37 PM

If there is any gap in the seals onto the exhaust ports then air will be drawn in and will ignite the exhaust gases.

17-12-06, 12:38 PM

I'd say that crack is the probable culprit. It's a similar situation to when fitting an after-market exhaust and not sealing it correctly, you usually get some (nice) pops and bangs and even the odd flame

Stu · 17-12-06, 04:57 PM

And the problem is...?

Sid Squid · 17-12-06, 10:32 PM

What you describe is the common symptoms of an exhaust leak.

18-12-06, 10:15 AM

Quote:

Originally Posted by Stu

And the problem is...?

I'll go loosen my pipes then!!!

18-12-06, 10:56 AM

meh mine does it, i ent worried, i know its prob blowing a tiny bit, but the sounds are good

18-12-06, 11:16 PM

I don't see a problem? mine does it and has big blue flames when rolling off the throttle love it!! gets people to move too!!!

sometimes makes me jump though if I'm tired and not expecting it!!!!

17-12-06, 12:29 PM	#1
Scoote Guest Posts: n/a	Barbling and backfiring I have a 2001 650s and the bike has developed this 'condition' over the past few months. Acceleration is ok although I am sure I can here air being drawn in. When I let the revs off it pops and bangs like a goodun, it doesn't always backfire but always grumbles. I have removed the exhaust and have found a very fine 20mm crack in the lower pipe gasket. Is that enough to cause this problem??? Have also removed the tank and checked around carbs but didn't find anything obvious. This is really annoying and as much as the twins do grumble as you slow I had 15 months of nothing so it must be fixable. Help me please!

17-12-06, 12:37 PM	#2
TSM The Sick Man Mega Poster Join Date: Nov 2004 Location: Peckham.SE.LDN Posts: 4,768	If there is any gap in the seals onto the exhaust ports then air will be drawn in and will ignite the exhaust gases. __________________ OTR: KTM 690 Duke R 2015 Full Akro SIDELINE: Kwak ZX636 A1P 2002, Red, R&G's, Yoshi, Double Bubble Screen GONE: Kwak ZX-7R P1, Full Akro, Undertray, Screen GONE: SV650S K2 Very Bruised & Without Fairing, Motovation Frame Sliders, R&G Ally Sprocket Toe Protector, HEL 2 Line Setup, GSXR K1 600 RWU Forks, Barnett Clutch & Springs, Penske 8981 Shock, Gilles Ti Rearsets, Steel Barends, Scottoiler, AFAM Chain & Sprockets, Twin FIAMM Horns, Skidmarx Bellypan, Full Micron Zeta Steel System, Cut down undertay. Forum Problems & Information / Site Suggestions

17-12-06, 10:32 PM	#5
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	What you describe is the common symptoms of an exhaust leak. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

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17-12-06, 12:38 PM	#3
carlos Guest Posts: n/a	I'd say that crack is the probable culprit. It's a similar situation to when fitting an after-market exhaust and not sealing it correctly, you usually get some (nice) pops and bangs and even the odd flame

17-12-06, 04:57 PM	#4
Stu Trinity Mega Poster Join Date: Jun 2006 Location: Guildford Posts: 8,027	And the problem is...?

18-12-06, 10:56 AM	#7
james160987 Guest Posts: n/a	meh mine does it, i ent worried, i know its prob blowing a tiny bit, but the sounds are good

18-12-06, 11:16 PM	#8
lew893 Guest Posts: n/a	I don't see a problem? mine does it and has big blue flames when rolling off the throttle love it!! gets people to move too!!! sometimes makes me jump though if I'm tired and not expecting it!!!!