02-02-2021, 02:56 AM
Mechanics have a long history or making mistakes (like all humans), including forgetting tools etc. inside the engine. It's hard to believe that the problem is NOT mechanic induced. If you have to go on a test ride, make sure you do it, where there is no traffic. if sth has been left inside the cyl head which doesn't belong there, it may break a cam or valve, leading to engine stop and an accident. Be careful !
Next, check the basics
- chain tension, oil level, etc. followed by
- speed or rpm: carefully check at different rpm/s while on main stand (do yo hear it at all, etc. is there a cut-off rpm, or do you just don't hear it less and less (still on the stand),
- temp: engine cold or warm
- hold a metal stick or tube against the engine housing and your ear (I am not joking), can you tell if there is a place where it's louder, left or right, etc.
- if you don't hear it at higher rpm/s (on the stand): is it really acceleration or just high rpm/s, in which gear ?
There is a lot you can do before you return her to the shop - unless you trust them a lot, or you don't care about the cost. Good luck
Next, check the basics
- chain tension, oil level, etc. followed by
- speed or rpm: carefully check at different rpm/s while on main stand (do yo hear it at all, etc. is there a cut-off rpm, or do you just don't hear it less and less (still on the stand),
- temp: engine cold or warm
- hold a metal stick or tube against the engine housing and your ear (I am not joking), can you tell if there is a place where it's louder, left or right, etc.
- if you don't hear it at higher rpm/s (on the stand): is it really acceleration or just high rpm/s, in which gear ?
There is a lot you can do before you return her to the shop - unless you trust them a lot, or you don't care about the cost. Good luck