SV650 Power Delivery Problem

[KTMsm]

I have an SV650 '08 injection

It was riding fine then the rectifier went - I mention it in case the 16v could have affected something

At around the same time / shortly afterwards, it developed a weird power issue

It will rev cleanly at standstill

When riding it's down on power, if you accelerate it will do so slowly and then a load more will come in quite abruptly

Its almost as if the second cylinder is coming in but the exhaust note doesn't change

It's like a sensor isn't giving the right reading for fuel, then it comes back in but even when the power comes back I think it's still down on power

It doesn't matter if you accelerate slowly or quickly or what gear you're in

It's not a slipping clutch

There are no fault codes nor engine lights

[trickywoo]

I think that’s a twin spark engine. Could be a bad plug with the other working well enough to fire but not run optimally.

[Marquezs Stabilisers]

Not had an SV before, but have had bikes with similar issues. Turned out to be coils

[carinaman]

Have you got access to one of those infra red non contact thermometers to compare the exhaust temperatures for each cylinder?

[KTMsm]

Thanks all

This is the earlier model with a single spark plug per cylinder - I've pulled them, they look okay maybe a smidge lean

I did wonder about the coil, generally when I've had failures they're ok when cold and fail when warm - certainly not discounting it but it felt like a fueling issue - although the plugs dispute that

I have got a temp sensor - worth a try