Ignition/Tuner/ECM/Fuel InjectionNeed advice on ignition issues? Questions about a tuner? Have questions about a EFI calibration or Fuel Injection? Tips on Engine Diagnostics, how to get codes, and what they mean. Find your answers here.
I pulled the rear valve cover and can't see anything wrong in the valvetrain. The rockers rock, the pushrods push, the tops of the valves are in the valve springs, all keeps are present, but there is no compression back here. Front cylinder makes a ****-tons; blows my finger outta the plug hole. I guess I have to go forward and pull the head. I don't have a borescope to look inside.
Can I pull the head off and the cylinder off if I have to replace the Piston, without removing the engine from the frame? Newby to Harley's, remember... Right side rockers/pushrods Left side rockers/valves/springs Intake valve Exhaust valve
These 1200s don't have a compression release for easier starting do they? There's some sort of electrical device by the top of the rear intake pushrod. Thought I'd better check before I tear the top off the rear cylinder. See photo. The Gizmo my knife blade is touching. Knock sensor? Compression release? Something else?
Bore scopes that hook or transmit to your phone ridiculously cheap on amazon. Why don't you order one and then you can see into the cylinder. Sounds like Max nailed it on post #3.
That's exactly what I did. It should be here tomorrow. No sense tearing the cylinder apart without first peeking inside it, though it's got to be a bent valve or a holed piston. The question in my mind is how does an engine with 3407 miles on it break down like this? Sabotage? The bike had some not-riding-related damage when purchased, as if someone beat on it while it was parked. I sure hope it's a bent valve. If something went through the piston, the crankcase will need to be cleaned up.
Someone mentioned earlier to look at the intake assembly for missing screws. It is quite possible that a screw from the air cleaner assembly was ingested. We have seen plenty of pics of such in here.
That's exactly what I did. It should be here tomorrow. No sense tearing the cylinder apart without first peeking inside it, though it's got to be a bent valve or a holed piston. The question in my mind is how does an engine with 3407 miles on it break down like this? Sabotage? The bike had some not-riding-related damage when purchased, as if someone beat on it while it was parked. I sure hope it's a bent valve. If something went through the piston, the crankcase will need to be cleaned up.
I'm not sure how a "holed piston" keeps the motor from turning over. There really needs to be something incompressible jammed between a moving and non moving part to stop things.
08-02-2020, 04:26 PM
Bad news
