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Discussion Starter #1
Hey guys. My 2013 F3 675 has an issue. I have the whole bike pulled apart down to the bare essentials and still can't find the problem

Issue: was canyon riding today and at around 80 MPH in a corner the bike bogged down huge and started to what is best described as a 250. Very deep grumble. It feels like it's running on one or two cylinders. Won't go above 70 mph and RPM is somewhat normal for each gear. If stopped the bike will slowly stall. Normal operating temp. No overheating.

I thought perhaps a vaccuum leak. No I checked everything

Maybe the fuel tank vent is blocked. No

Maybe exhaust valve is messed up. Nope

I pulled the spark plugs and all look good and tan

Could this be as simple as a dead battery? Would the bike act that way?
 

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What was the TC set to?
What you describe is what I think my bike was doing when the TC was set too high. The bike decided to cut power even though there was no wheel spin.
During my first year with my 2013 F3 it also would surge when leaned over in high speed sweepers.
 

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Discussion Starter #3
What was the TC set to?
What you describe is what I think my bike was doing when the TC was set too high. The bike decided to cut power even though there was no wheel spin.
During my first year with my 2013 F3 it also would surge when leaned over in high speed sweepers.
It totally feels like TC is cutting power. I always have it set on 1. I moved it to zero and still nothing. I noticed the wheel speed sensor which I think also monitors TC is wearing down. I don't think that's normal and maybe is part of the cause. Maybe if I disconnect the sensor and see if that helps? I ordered a new battery and three new Coils to see if that fixes any issue
 

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Discussion Starter #4
I hope it's the coils or battery. If not I'm not sure where to look and it may have to go to the dealer. Ugh!
 

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He would have gone past the airfilter to get to the spark plugs so I would doubt that...

Do give a bit more info, it first happened while leaning over, does it do it all the time since that moment or only while leaning over under similar conditions (that wasnt explained too clear)


Just a few shots in the dark here here:

1. Didnt hit the pit speed limiter accidentally by any chance?
2. Throttle position sensor (throttle grip), any errors there?
3. Raw fuel smell? Sooty exhaust?

My brothers B3 675 had really dodgey fueling after its first service and map update, on the freeway it would just cut power and be completely unresponsive and then recover a few seconds later. Fuel consumption was also really bad. Took it back and had them reload the software and calibrate everything and been good since then. I take it you havent hooked it up to the Texa diagnostics or done a map change recently?

Most probably the coils as you mentioned, do replace the plugs while you there and also check the valve clearances since you've gone through the effort of stripping half the bike to get to the plugs (as a preventative thing, doubt the valves would be the issue here).

If the TC is OFF, why would it still interfere?

Let us know if you get it up and running.
 

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Discussion Starter #7
He would have gone past the airfilter to get to the spark plugs so I would doubt that...

Do give a bit more info, it first happened while leaning over, does it do it all the time since that moment or only while leaning over under similar conditions (that wasnt explained too clear)


Just a few shots in the dark here here:

1. Didnt hit the pit speed limiter accidentally by any chance?
2. Throttle position sensor (throttle grip), any errors there?
3. Raw fuel smell? Sooty exhaust?

My brothers B3 675 had really dodgey fueling after its first service and map update, on the freeway it would just cut power and be completely unresponsive and then recover a few seconds later. Fuel consumption was also really bad. Took it back and had them reloa[/ATTACH] the software and calibrate everything and been good since then. I take it you havent hooked it up to the Texa diagnostics or done a map change recently?

Most probably the coils as you mentioned, do replace the plugs while you there and also check the valve clearances since you've gone through the effort of stripping half the bike to get to the plugs (as a preventative thing, doubt the valves would be the issue here).

If the TC is OFF, why would it still interfere?

Let us know if you get it up and running.


Took it a step farther. I did a compression test. From left to right it reads 210, 0, 180. Pulled the valve cover too peak no visual clues.

image.jpeg
 

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Discussion Starter #8
Ta da! Here it is folks. Sorry for so many replies. I just wanna keep ya posted on my progress. Check out that bad boy. image.png
 

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Full exhaust or just an end can? Given the cat is in the headers, I'd agree that it'd be massively unlikely that putting an end can on it would bother the fuelling enough to burn off a valve.

I'd definitely approach MV to see if there's any form of goodwill fix on the cards - engines shouldn't be dropping valves at three years old.
 

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Thanks for keeping us in the loop. At least you have found the problem. The easy bit is replacing the valve. Finding the cause may be harder. Hope you sort it with minimum issues.
 
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