SV hesitating - SV650.org

14-10-15, 02:51 PM

Hi, just got myself a 2007 SV650S and got a problem already.

In gears 2-6, at WOT, between 7-10k RPM it hesitates and backfire.

Any ideas ? I've replaced the spark plugs and the wires already.

15-10-15, 10:02 AM

Possibly a fuelling issue if you have ruled out ignition

15-10-15, 05:46 PM

Any idea in the system ? Are the pumps or filter a common problem ? I was thinking it's my exhaust. When I got it, I put a Delkevic system on it.

Craig380 · 15-10-15, 06:55 PM

Does it run and ride fine when it's NOT at wide-open throttle? Is the airbox and filter standard or modded? Is the Delkevic a full system or just the can?

Before diving into the fuelling, I'd double-check the really basic stuff like the battery condition, that the terminals are clean & tight etc. Are the clutch switch connectors clean and free of corrosion, and the connector pushed fully home? Maybe give the sidestand switch a good spray with contact cleaner to rinse it out too. Any of those could cause a misfire.

DJ123 · 15-10-15, 07:34 PM

Potentially an air leak. Check the air box is fully seated on the throttle bodies, and they are also properly seated onto the inlets.

Biker Biggles · 16-10-15, 06:55 AM

Did it run ok before you put the different exhaust on it?The solution is normally found by looking at what you have changed or adjusted.

16-10-15, 12:16 PM

Full throttle problems tend to rule out air leaks because vacuum is at it's lowest. These conditions place the highest load on the HT system, I would be investigating electrical system condition, e.g. battery condition, charging voltage, swapping coils with a known good alternative etc

14-10-15, 02:51 PM	#1
thedyna Guest Posts: n/a	SV hesitating Hi, just got myself a 2007 SV650S and got a problem already. In gears 2-6, at WOT, between 7-10k RPM it hesitates and backfire. Any ideas ? I've replaced the spark plugs and the wires already.

15-10-15, 10:02 AM	#2
Corny Gizmo Guest Posts: n/a	Re: SV hesitating Possibly a fuelling issue if you have ruled out ignition

15-10-15, 05:46 PM	#3
thedyna Guest Posts: n/a	Re: SV hesitating Any idea in the system ? Are the pumps or filter a common problem ? I was thinking it's my exhaust. When I got it, I put a Delkevic system on it.

15-10-15, 06:55 PM	#4
Craig380 Member Mega Poster Join Date: May 2015 Posts: 1,302	Re: SV hesitating Does it run and ride fine when it's NOT at wide-open throttle? Is the airbox and filter standard or modded? Is the Delkevic a full system or just the can? Before diving into the fuelling, I'd double-check the really basic stuff like the battery condition, that the terminals are clean & tight etc. Are the clutch switch connectors clean and free of corrosion, and the connector pushed fully home? Maybe give the sidestand switch a good spray with contact cleaner to rinse it out too. Any of those could cause a misfire.

15-10-15, 07:34 PM	#5
DJ123 Member Mega Poster Join Date: Jul 2011 Location: Somewhere over there Posts: 3,245	Re: SV hesitating Potentially an air leak. Check the air box is fully seated on the throttle bodies, and they are also properly seated onto the inlets. __________________ BMW F800ST

16-10-15, 06:55 AM	#6
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: SV hesitating Did it run ok before you put the different exhaust on it?The solution is normally found by looking at what you have changed or adjusted. __________________ On a clear day we stand there and look further than the ordinary eye can see.

16-10-15, 12:16 PM	#7
AlexAdams Guest Posts: n/a	Re: SV hesitating Full throttle problems tend to rule out air leaks because vacuum is at it's lowest. These conditions place the highest load on the HT system, I would be investigating electrical system condition, e.g. battery condition, charging voltage, swapping coils with a known good alternative etc