Hey guys,
Yamaha 200hp 6G6 200BETO C (91 model) has done a couple of pistons on me.
Half way through a 250km trip, the motor started hunting (going up and down from full power), as if it were running low on fuel. As I was 100kms offshore there wasnt really much I could do other than baby it home.
It got us into the harbour where revving at 2500rpm it came to a sudden hault.
Towed home, took her apart, and the top Port piston has snapped at the wrist pin, with a lot of damage around the edges and a lot of debris has been pushed into the head.
The top starboard piston has a lot of damage and debris, but is still connected and in tact. There is a small hairline crack in the sleeve at the end of the bore.
I am looking for a cause, would it be a blocked top carby?? Or the top fuel pump?
I am only looking for a couple more months out of this motor(by no means 250km trips), so would slapping a couple new pistons in and cleaning the carbies be ok for the time being??
Cheers
Yamaha 200hp 6G6 200BETO C (91 model) has done a couple of pistons on me.
Half way through a 250km trip, the motor started hunting (going up and down from full power), as if it were running low on fuel. As I was 100kms offshore there wasnt really much I could do other than baby it home.
It got us into the harbour where revving at 2500rpm it came to a sudden hault.
Towed home, took her apart, and the top Port piston has snapped at the wrist pin, with a lot of damage around the edges and a lot of debris has been pushed into the head.
The top starboard piston has a lot of damage and debris, but is still connected and in tact. There is a small hairline crack in the sleeve at the end of the bore.
I am looking for a cause, would it be a blocked top carby?? Or the top fuel pump?
I am only looking for a couple more months out of this motor(by no means 250km trips), so would slapping a couple new pistons in and cleaning the carbies be ok for the time being??
Cheers