SV hesitating

[thedyna]

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.

[Corny Gizmo]

Possibly a fuelling issue if you have ruled out ignition

[thedyna]

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]

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]

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]

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.

[AlexAdams]

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