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@HTX_713 all depends on your abilities and how much time you have to spend. If you do it your self and source all your own parts it can be done for probably $1200-$2500 with used parts and waiting for deals....

Machine shop will charge $500-$1500 to bore the block, blueprint the engine, balance the rotating assembly, and magnaflux to check for cracks.

You may have bent a rod or two and your pistons are garbage so its iffy that your block doesn't have a chunk missing where the rod bends and smacks into the lower side of the bore wall.

But if your rods are ok and your block is able to be machined enough to take out the gouges in the cylinder walls then you got lucky.

New complete head
Pistons and rings
Rods and bearings
Machine work
Head and rod bolts
Gaskets
Installation lube


Here's for hoping!

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Discussion Starter #24
Thanks for the info. That’s definitely out of my skill set. We’ll see what the final outcome is.
@HTX_713 all depends on your abilities and how much time you have to spend. If you do it your self and source all your own parts it can be done for probably $1200-$2500 with used parts and waiting for deals....

Machine shop will charge $500-$1500 to bore the block, blueprint the engine, balance the rotating assembly, and magnaflux to check for cracks.

You may have bent a rod or two and your pistons are garbage so its iffy that your block doesn't have a chunk missing where the rod bends and smacks into the lower side of the bore wall.

But if your rods are ok and your block is able to be machined enough to take out the gouges in the cylinder walls then you got lucky.

New complete head
Pistons and rings
Rods and bearings
Machine work
Head and rod bolts
Gaskets
Installation lube


Here's for hoping!

Sent from my SM-G930V using Tapatalk
 

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OR...it could be that only one piston crown has some damage and the crank and cylinders are just fine. A really good head machinist could likely repair a head by welding and refinishing and replacing damaged seats and guides.

The cylinders are plated, so you don't bore them...but there are specialists who will repair and replate if needed.

See what Bruce said in his PM...he knows what's up.
 

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If anyone has a lead on a F3 800 engine that would be great. My 2017 dropped a valve so I’m looking to buy one soon
I really hope you get taken care of by the factory or dealer. But if that fails, I have an 800 engine here. It’s used but in great shape, as attested by my mechanic who inspected it inside out. I was going to keep it for spares but I’d be happy to part with it if it helps a fellow F3 owner.
 

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Discussion Starter #27
I’m going to private message you for details

I really hope you get taken care of by the factory or dealer. But if that fails, I have an 800 engine here. It’s used but in great shape, as attested by my mechanic who inspected it inside out. I was going to keep it for spares but I’d be happy to part with it if it helps a fellow F3 owner.
 

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Really interesting that your valve snapped right after you did your valve service. Mine snapped (2014 F3 800) <70 miles after I did my 7500 mile valve service. MV sent me a new engine under warranty. And I talked to someone with an 2017 F3 800 whose valve justbsnapped <200 miles after he did his valve service. He's still waiting to see what MV does. I know correlation does not equal causation but that's just odd. Good luck getting your bike back on the road.
 

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Discussion Starter #29
That’s interesting. Thanks for sharing. I hope MV has all this well documented so they won’t try to say I was abusing the bike and they’ve never seen this happen before. I was barely going 90 after a nice cruise through some 15 mph curves when it happened.

Really interesting that your valve snapped right after you did your valve service. Mine snapped (2014 F3 800) <70 miles after I did my 7500 mile valve service. MV sent me a new engine under warranty. And I talked to someone with an 2017 F3 800 whose valve justbsnapped <200 miles after he did his valve service. He's still waiting to see what MV does. I know correlation does not equal causation but that's just odd. Good luck getting your bike back on the road.
 

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Really interesting that your valve snapped right after you did your valve service. Mine snapped (2014 F3 800)

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Were your valves actually adjusted? @HTX_713 says they didn't adjust his they just checked the clearances and put it back together.....
 

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Guys, I believe the correlation between the valve checks and the valves failing is the mileage (12000km). My F3 broke a piece of valve spring at 12500km , shortly after my valve check also. Luckily it was only a small piece and not the entire spring hence I didnt drop a valve. I dont think our valve springs are lasting more than 12000km. Aprilia RSV4 bikes are having (or had) similar issues with dropped valves due to valve spring failure.
 

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Guys, I believe the correlation between the valve checks and the valves failing is the mileage (12000km).
I agree it is the millage. My 2014 engine dropped valve right around the time for the valve check. My 2018 engine replacement has close to that millage on it now which has me thinking of selling the bike but I love it too much.
Supposedly my engine was one of the first out of the factory with the latest head at the time which included the service bulletin update after the 2018 head update.
Part of me whats to sell it, the other part is saying, fuck it...if it blows have Bruce rebuild.
 

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Why not go in and replace the valve springs before they break? This is sounding a little like the Porsche IMS bearing fiasco.
 

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Why not go in and replace the valve springs before they break? This is sounding a little like the Porsche IMS bearing fiasco.
That's what I will do after this rebuild. I consider valve springs on our F3s as a wear & tear item.
 

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What brand makes a good known set of springs?

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Were your valves actually adjusted? @HTX_713 says they didn't adjust his they just checked the clearances and put it back together.....
Yes, one of my valves was slightly off (a left cylinder exhaust) and they adjusted it. But the valve that snapped was a middle cylinder exhaust.
 

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Yes, one of my valves was slightly off (a left cylinder exhaust) and they adjusted it. But the valve that snapped was a middle cylinder exhaust.
I wonder how close it was to being out of spec. Did they give you a peice of paper with the print out of the tolerances before and after? Since valves do tighten up (and this problem seems to be re-occurring) I wonder if we should all be erroring on the sloppier side of the "acceptable" range of tolerances. This might mean sanding and polishing the shims to the exact specs.

That is, if the root problem is tolerances and not faulty springs or retainers.

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Don't sand on the shims....first they are damned hard material, second they have to be perfectly flat. Must be surface ground.
 
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Discussion Starter #40
So just to update everyone who chimed in or for those interested. MV good willed the engine, but the shop is asking $3k to install the engine. Engine expected to arrive in a few weeks
 
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