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Discussion Starter · #1 ·
Seeing if anyone's had the same issue or possible solution to the one I'm having.

Recently picked up a 2010 Ducati 696 and it's hesitating at lower RPMs, more so when the motor's cold.

For example, in 2nd gear 4K~5K RPM, I'd whack the throttle wide open but it'd stay at the same RPM for a second or two until the power kicks in abruptly. It also backfires A LOT under decel. Currently has a Competition Werkes slip-on.

Any help or insight will be appreciated.
 

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A lean fuel mixture will cause both problems.

You get poor throttle response and get more backfires from a lean mixture. An excessively lean mixture is hard to ignite reliably so there's more combustion cycles where the mixture doesn't ignite in the combustion chamber and the air/fuel mixture is sent out the exhaust where it meets another ignition source — the hot metal piping.

However, there's also a number of reasons why the air and fuel mix doesn't ignite — so it's not just lean mixtures that end up in the exhaust piping. For example, when you quickly cut the throttle the air/fuel mixture is in transition and more unburnt fuel ends up in the exhaust. This is usually the worst situation for experiencing backfires. Another most common cause of backfiring on the overrun is an incorrect TPS setting. If the TPS setting is wrong then it will send a signal that the throttle is closed more than it really is, so you get a leaner mixture.

Any fuel that hasn't been burned will end up in the hot exhaust piping and normally pass right through. But if you add more air to the fuel from an exhaust pipe fitting or crack, you now have all the ingredients for an explosion, the hot pipe is the ignition source and you get a backfire.

Without the additional combustion air from the exhaust leak you are less likely to get a backfire.

First, you need to inspect the piping for cracks and leaks at or near the exit from the engine — then check for leaks at junctions.

Aftermarket pipes or catalytic converter eliminator piping segments are not a precision fit at junctions so you need disassemble and reassemble the joints using a high temperature silicone sealant. I recommend Permatex Ultra-Copper high temp RTV silicone gasket maker.

Plug Gaps and Lean Fuel Mixtures

Check your spark plugs. Incorrectly gapped plugs will cause misfires and a degraded throttle response during fast throttle position changes. Fine wire electrode plugs that are gapped too small have trouble firing lean mixtures.

Iridium and platinum electrode plugs NEED to be gapped larger. Some owners make the mistake of gapping them to the specification for non-iridium/platinum plugs. You have to install them as gapped (0.035 in.) straight out of the box, NOT the 0.024 in. that Ducati specifies for use with conventional spark plugs.

Misfire problems don’t develop until the engine warms up, and coincidently as the fueling leans out because of temperature sensors. Fine wire electrode plugs that are gapped too small have trouble firing lean mixtures, particularly at high rpm.
 

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Discussion Starter · #3 ·
Much thanks for your insight. Will check for leaks and inspect plugs and see how it goes.


Sent from my iPhone using Tapatalk
 

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closed loop ecu, which yours will have unless it has been reflashed, tend to give symptoms like that at lower rpm and overrun.

a flatspot on acceleration is a bit different. maybe fuel, fuel filter related.
 
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