Interested in a gory, cant pass an accident without looking, kind of way.
The cylinders of an FJR are not sleeved. They are Nikasil plated bores.Are the cylinders sleeved?
Not sure where that info came from. I was under the impression that they didn't change anything significant in the base engine, just exhaust and intake stuff.My understanding is that up to 2012, the engines had pressed-in, ceramic coated, steel liners. From 2013-onwards they were all-aluminium with a plated-on coating, supposedly to improve cooling. I think there has been a change in coating material since 2013, but I am not sure. Nikasil sounds familiar, but whether the "changed from" or the "changed to", dunno. Far too many birthdays.
I am no expert and I only know what I have read. My understanding is that Yamaha uses Nikasil or some proprietary variation of it and it does form a ceramic coating on the cylinder walls.Pretty sure the liner isn't Nikasil. That's just a suspension of silicon carbide particles in a nickel electroplating solution so the resulting plating layer will be very thin. The liner that has broken off is probably some new fangled propriety liner. The fracture surface is consistent with a very hard metallic or ceramic material.
I missed that these pics weren't of the offending bike.Be aware that the photos linked to by jeremy62 are of a completely different engine (in Ireland?), not Intech's brother's bike. FWIW - the cylinders were always said to have "Ceramic Composite Cylinder Coating". They could still be sleeved. By the looks of jeremy's photo it sure looks like they are.Not sure where that info came from. I was under the impression that they didn't change anything significant in the base engine, just exhaust and intake stuff.My understanding is that up to 2012, the engines had pressed-in, ceramic coated, steel liners. From 2013-onwards they were all-aluminium with a plated-on coating, supposedly to improve cooling. I think there has been a change in coating material since 2013, but I am not sure. Nikasil sounds familiar, but whether the "changed from" or the "changed to", dunno. Far too many birthdays.
Back to Intech's old '07:
The #3 Fuel injector must be stuck wide open. Thats the only way I can think of for that much fuel to get in there. Would explain the engine stalling out (all of the fuel rail pressure would dump into the one cylinder), and the subsequent appearance of being seized. If the cylinder was full of incompressible fuel, it would mimick seizure (called hydro lock) until the fuel is removed.
If the bottom end survived the hydro lock you may be able to just fix the fuel leak and put it back together.
Boy does this bring up bad memories! I had a DRZ400 that had all kinds of fueling issues in the carburetor. One day my wife comes in and says that the garage stinks of gas. Right away I know its the DRZ carb. So I go out and hit the starter - nothing at all. Try again - still nothing.Back to Intech's old '07:
The #3 Fuel injector must be stuck wide open. Thats the only way I can think of for that much fuel to get in there. Would explain the engine stalling out (all of the fuel rail pressure would dump into the one cylinder), and the subsequent appearance of being seized. If the cylinder was full of incompressible fuel, it would mimick seizure (called hydro lock) until the fuel is removed.
If the bottom end survived the hydro lock you may be able to just fix the fuel leak and put it back together.
HRZ, you know I hate arguing with you, however ...2: FJR cylinders were never steel lined. They have always had the ceramic composite. I'm under the impression that hasn't changed for the newer model years, as the engine is the same, but it's possible. Since I have an '07, there's little reason for me to be too concerned about how the new engines are built....
A reference to a 2007 with cylinder liner damage, with pictures clearly showing the liner, I reproduce one:New for 2013...
The engine's cylinders feature a liner-less design with direct plating to the cylinder wall for superior heat dissipation.
Like you, when all is well, it doesn't matter to me how it's made, but it might be relevant to the "grenaded" engine this thread is about.The bike would remain relatively unchanged ... with 2013 to see the Gen-III model released.The Gen-III featured new fairings,
...
ENGINE
Tweaks to Yamaha’s venerable 1298cc inline-four have improved efficiency and delivery, and include ...
...
Also adopted are sleeveless bores similar to Yamaha’s sportsbike engines. Removing the liner and combining advanced honing processes with a nickel blend metal imbedded with hard silicon carbide particles results in a super smooth finish that improves oil retention with excellent sliding characteristics for the pistons.
No liner also reduces engine weight and improves temperature control meaning reduced friction, oil consumption and engine wear. Power is 145hp at 8500rpm, while torque is 125Nm at 6000rpm, with a five-speed transmission transmitting power through the shaft final drive.
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