reignman
Well-Known Member
History:
My sister has a 1990 ninja 250 that has been had been having some issues. was extremely hard to start and barely idled when it did. decided to check valves and find a broken rocker arm on one cylinder. i replaced the rocker arm and adjusted the valves and it was starting and idling much better! went to ride it to test it out and fill it up with fresh gas and when accelerating i heard an awful noise that sounded like when the key is turned once a car is already started. limped the bike home where the investigation has begun.
i tested the compression and the left cylinder has about 120 psi...the right was 0. pull off the valve cover and see that the valve collets missing, the rocker is displaced and the valve has dropped.
clearly that is the issue causing the massive loss of compression. my question is what all do i need to repair/replace? the valve is bent, the collet broken (luckily i retrieved all the pieces) and the rocker is pretty deeply scored. there is also a small nick out of the top of the piston but i dont really think that will cause any issues? there are also a couple chips in the top portion of the cylinder wall and the edge of the cam lobe is scraped off. im really just trying to get the bike running again for her and get rid or it so i want to spend as little as possible. I know that at a minimum the valve rocker and collet need replaced but im not sure if the other parts are fine or not. what do you guys think?
My sister has a 1990 ninja 250 that has been had been having some issues. was extremely hard to start and barely idled when it did. decided to check valves and find a broken rocker arm on one cylinder. i replaced the rocker arm and adjusted the valves and it was starting and idling much better! went to ride it to test it out and fill it up with fresh gas and when accelerating i heard an awful noise that sounded like when the key is turned once a car is already started. limped the bike home where the investigation has begun.
i tested the compression and the left cylinder has about 120 psi...the right was 0. pull off the valve cover and see that the valve collets missing, the rocker is displaced and the valve has dropped.
clearly that is the issue causing the massive loss of compression. my question is what all do i need to repair/replace? the valve is bent, the collet broken (luckily i retrieved all the pieces) and the rocker is pretty deeply scored. there is also a small nick out of the top of the piston but i dont really think that will cause any issues? there are also a couple chips in the top portion of the cylinder wall and the edge of the cam lobe is scraped off. im really just trying to get the bike running again for her and get rid or it so i want to spend as little as possible. I know that at a minimum the valve rocker and collet need replaced but im not sure if the other parts are fine or not. what do you guys think?