Piston slap?
1 - 16 of 16 Posts
I would take all needed measurments (cyls bore, pistons, rings, pins) and compare those with the reference data from manual. Then I could make decission about repair. If bore under limits I would makes walls renewal by very light honing as max (in case of iron liner). I don't know this engine has an iron liners or has an aluminium monoblock
I think this is the oil carbon. I would check one of the valve stem seals for worn and elasticless.
That marks look likes a result of overheating or oil starvation (clogged oil jets maybe?). Have you a photo of the corresponding side of the piston?
Joined
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107 Posts
I'd check valve stem oil seals and also re-lash the valve seats, they may not be seating properly.
Joined
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96 Posts
Toss in some Redline SL1 for two tanks then check the throttle bodies. Your fueling could be off or a sticking injector.
My valves are heaps worse then that. But the engine still runs good though.
I've had my crank vent hose disconnected for the last 40K, after i cleaned my valves. But they are
back to about the same now. So the carbon is not coming from the crankcase pressure, but more
likely valve stem seals (as mentioned above).
But from your other post, you mentioned that you changed the valve stem seals. So i'm not sure
whats going on there. Maybe yours is coming through the crank case?
Also, the knocking sound from your other video, could it be from the clutch area?
Is the knock worse with the clutch lever pulled?
There was a guy on here who had loose pins on the back of his clutch basket.
Just a thought.
I've had my crank vent hose disconnected for the last 40K, after i cleaned my valves. But they are
back to about the same now. So the carbon is not coming from the crankcase pressure, but more
likely valve stem seals (as mentioned above).
But from your other post, you mentioned that you changed the valve stem seals. So i'm not sure
whats going on there. Maybe yours is coming through the crank case?
Also, the knocking sound from your other video, could it be from the clutch area?
Is the knock worse with the clutch lever pulled?
There was a guy on here who had loose pins on the back of his clutch basket.
Just a thought.
Joined
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96 Posts
If you remove the stator cover I know on my K7 I can actually inspect the rods and lower cylinders with a flash light behind flywheel. Deff cyl # 1,2 cyl 3,4 might be harder to inspect. I do see that triangler mirror finish on wall in the bore which looks polished.
Joined
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525 Posts
As I saw in the photo of the valves, your valve stem seals are leaking. So warm up the engine, and then measure the compression ASAP.
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