[ChopperChas]

You admitted you have a dodgy sidestand switch. This can easily cause cut-outs at higher rpms, when vibration may cause the switch to trip.

If you're not getting a code, it's not a sensor problem. That means this has got to be either electrical or fueling. The first thing I'd do is bypass the sidestand switch. If that doesn't fix it I'd look into a coil pack failing or more likely a fuel pump. Did you buy the bike new? If it's older and used I will say that the fuel filter and pump do not like to sit unused for a long time. I'd also re-seat the connectors to the fuel pump, ECU, and coil packs.

Charles.

 

[ChopperChas]

De-catting it changes where the most vibration happens, and if your side stand switch (which you already said is bad) is being activated by vibration, it makes sense that the point it trips changes in the same way.

Fix one problem at a time. Just bypass the switch to start with. If I'm wrong, then there are other options. Laptop, dongle, adapter, and free ecu software will tell you a lot (under $100 for the dongle and adapter cable. Cheap as far as diagnostic equipment goes.). You can record yourself riding and then inspect every sensor readout during the times power drops off. Helped me diagnose a bad ECU on my CSC RX3. (note to self: Unplug and remove ECU before welding on the frame)

Charles.

 

[ChopperChas]

And just FYI, 10,000 miles (16k km) and I've never had this choking problem you're talking about. I've never heard of anyone else having this problem on a Leoncino or TRK502.

Charles

 

[ChopperChas]

So, there is a flat spot in the power band where the bike feels like it hits a wall, and accelleration is slower and vibration is higher. That's right around 7000rpm. Is that what you're talking about? Or are you talking about an actual problem with the motorcycle?

If that is what you're talking about, then I understand. I've done a full decat (headers and midpipe), filter, and ECU flash and I have more power across the board. But shittier gas milage, which was never that good to begin with. The biggest change was from the air filter. That was the last thing I tried, but I recommend it be the first. The bike simply can't breathe, and there is significant top-end power to be had with inexpensive mods. Won't change much below 6000 rpm, but above it the bike is night and day better.

Charles.