Sudden Stall. Start Problems On Smr 511.

Hi there, not so active posting but used to own a 449. Recently I bought a 511. I do notice quite some difference in power.

Background: butterfly mod, full akra, mapping updated

During a night ride the bike suddenly lost power in 6th gear. Shifted to 4th gear and stalled. Never got it running ever since. There are some oil issues (on 449 I had the breather mod), right now I do not have one installed.
There is oil all over the engine, and I do some proper cleaning every ride.

After the bike broke down on me, I did the following things:

- Removed air filter box, plenty of oil in (no surprise)
- Checked cooling system, no oil inside. (head gasket is fine)
- Changed spark plug, tested outside cylinder. Spark looks okay.
- Measured coils
- Bypassed kill switch
- Checked throttle body, no oil inside.
- Removed valve cover and check valve clearances
- Tried to read the ECU, however I get 'ECU is not responding' using tuneECU and windows laptop.

- Battery is full, and contacts are clean
- After some seconds blue flame appears out of the exhaust, pretty rich.

My thoughts are;
All the oil spills got soaked into the wiring harness and is causing issues. That could explain the non-responding ECU. It does not rule that last one, though, could be the laptop.
The dashboard is fine, does that rule out the ECU as well?

I could try to switch back to race map 1.
Refuel? Check injector? How do I test/clean it? And remove it ofcourse?
I am out of options though.

Hope to hear some tips or experiences from you.

Hi, doesn't sound great.
First question, does the bike have a JD tuner attached?
Recent models of this tuner have been blowing up ecus...

I just found out the piston has a huge fracture along the small end axis.
New piston it is.
This is more common problem on a 511. The 449 has smaller diameter pistons (duh).

Well, that will do it.
Not common, but curable.
Hopefully the bore and bottom end are fine.
If you are looking for genuine top end parts, we have a member on our FB page who has some new old stock 511 barrel and pistons.
https://www.facebook.com/groups/219900571553501/?ref=share