Hello All,
I have a KZ550 LTD model, it has 38k miles on the engine.
I did a compression test last week, Cylinders 1,2, and 4 are all around 140 psi. However cylinder 3 is around 70 psi. The oil was drained and the engine was cold. So I added some oil down cylinder 3 and the psi jumped up to 120 psi. Bad rings.
The bike always idles rough since the day I got, with 25k miles. I have to leave the idle above 1500 rpm. I never once was able to turn on the bike without using the choke from a cold start. Even when its 90 degrees outside.
I recently rebuilt the crabs back to spec, In 1,2,3,and 4 gear the bike accelerates nice and smoothly. However in 5 or 6 gear it SOMETIMES has trouble. It is like when I give it throttle I go nowhere the engine just chokes up. Also when going 70 mph in 6 gear when I do WOT I literally go nowhere and after like 30 seconds the bike actually brings to go faster then 70 mph. The bike was doing the same thing BEFORE i rebuilt the carbs. I have a feeling its because of cylinder 3 having low compression.
Another thing i also noticed is the carbs don't have the correct fuel level when the petcock is on "ON" or "RES". The air tube that connects to the carbs goes to cylinder number 3.
So, I am thinking that cylinder 3 is pretty much gone by now. What do you guys think??
Oh last year I checked the valves clearances too, it's in spec now. I just know someone was going to say check the valve clearances, lol.
I have a spare 550 motor for a A3 Model. I am planning on removing those pistons and rings and installing them into C3 motor. Should I only exchanges the pistons and rings. Or also included the A3 block too?