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weird engine noise (recorded)
- Thread starter anvilsteel
- Start date
wherearewe
Rub on Ya Titties
If you suspect a valve issue, have you tried compression testing? What about using an upper cylinder head lubricant or combustion chamber cleaner?
anvilsteel
XS650 Enthusiast
Compression:
Dry: Left 80/Right 80
Wet: Left 120/ Right 130
combustionchamber cleaner (Forte Moto Power II) is in the fuel, unfortunately I can't take the bike for a ride. I think the stuff works beter on the road then stationary on the pavement.
Thanks for thinking out loud
Dry: Left 80/Right 80
Wet: Left 120/ Right 130
combustionchamber cleaner (Forte Moto Power II) is in the fuel, unfortunately I can't take the bike for a ride. I think the stuff works beter on the road then stationary on the pavement.
Thanks for thinking out loud
anvilsteel
XS650 Enthusiast
Thanks TwoMany,
it took me some time to read and understand it. My English is ok, but not my native language.
I'll be taking of the exhausts and covers and check the valves on the intake and outlet side.
We'll see what I'll find.
anvilsteel
XS650 Enthusiast
Today I checked the valve clearance again. I'v sparayed the intake valves with brakecleaner kicked the engine over for some time and used a cloth to wipe of the debris.
After this I checked the proper valve clearence again. Intake on the left side was off (gap too small).
Then I rebuild it and started again. Still no improvement. The engine keeps coughing back through the left-side carb.
Guess I have to take out the engine to inspect the cilinder head...
After this I checked the proper valve clearence again. Intake on the left side was off (gap too small).
Then I rebuild it and started again. Still no improvement. The engine keeps coughing back through the left-side carb.
Guess I have to take out the engine to inspect the cilinder head...
wherearewe
Rub on Ya Titties
Compression:
Dry: Left 80/Right 80
Wet: Left 120/ Right 130
combustionchamber cleaner (Forte Moto Power II) is in the fuel, unfortunately I can't take the bike for a ride. I think the stuff works beter on the road then stationary on the pavement.
Thanks for thinking out loud
Hmmm that compression is pretty low....
anvilsteel
XS650 Enthusiast
Yesterday I redid the compressiontest. This time using the electric starter.
Both sides now are 120 psi.
I took off the neccesary things from the engine so I can take it out later this week and inspect the cilinder head.
I know that the PO twice had a hole in one of the pistons due to running it to lean. Maybe this caused some collateral damage that hasn't been sorted out at that time.
Both sides now are 120 psi.
I took off the neccesary things from the engine so I can take it out later this week and inspect the cilinder head.
I know that the PO twice had a hole in one of the pistons due to running it to lean. Maybe this caused some collateral damage that hasn't been sorted out at that time.
When you get the head off, closely examine the valves and piston pockets for any signs of impact...
anvilsteel
XS650 Enthusiast
Update...
Last weekend I pulled the engine out and removed the top end.
I found a lot of dirt, oil, fuel, carbon inside.
[/IMG]
valves
[/IMG]
pistons
And I did the infamous leak-test
[/IMG]
Clearly the leftside intake valve is leaking.
No wonder it kept popping back.
I am now decarborising, cleaning, assessing, etc.
I'll keep you posted.
Last weekend I pulled the engine out and removed the top end.
I found a lot of dirt, oil, fuel, carbon inside.
[/IMG]
valves
[/IMG]
pistons
And I did the infamous leak-test
[/IMG]
Clearly the leftside intake valve is leaking.
No wonder it kept popping back.
I am now decarborising, cleaning, assessing, etc.
I'll keep you posted.
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