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Discussion Starter · #1 · (Edited)
Hello, everyone.
Today my engine blew up on the highway.
I was riding in 6th gear when my check engine light started blinking, oil light came on and the bike started rapidly loosing speed.
I pulled over immediately, shut off the engine, called a tow truck.

I turned the bike on one more time on the side of the road to see if it would start.
It's clearly running on one cylinder, smoking out of the exhaust and smells like oil, I will attach a video.

What do you hear from the video, any ideas?
Is the motor totally blown, what could be the issue?
Blown piston rings, injectors, vacuum problem maybe?
 

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I don't have any valuable answer for why it's blown but seems weird that you got it tuned and then 2 days later the motor blows up.
I would not just let the tuner get away with this.
Is it a well known tuner or some garage starter?
 

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Something definitely ain’t right, I wouldn’t ride it anymore. I would check the plugs, I bet one of them will have oil on it. Highly doubtful anything the tuner did caused this. Unfortunately this sounds and looks like an engine tear down.
 

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Might be worth taking the plugs out and sticking a camera in to have a look before you do anything too labour intensive. The state of the plug on the dead cylinder will likely give you a big clue: holed piston maybe?

Did you get a dyno printout with afr? If it ran OK on the Dyno with good AFR then maybe it went lean at the track due to something else which might explain the power on "rattle" you mentioned.
 

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Well, the thing is your tuner tuned it. You reported a power on rattle to said tuner who assured you it was OK. Then the motor went pop......🤔

Was it actually tuned or was a generic r7 map just plonked on? I say that because isn't the restricted version actually a slightly different motor? Isn't it a 640? Dunno how much of a difference that would make.
 
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