AuburnVFR
Jet Boat Addict
- Messages
- 86
- Reaction score
- 151
- Points
- 102
- Location
- Auburn, AL
- Boat Make
- Yamaha
- Year
- 2016
- Boat Model
- SX
- Boat Length
- 19
I have a 2008 FXHO with the MR-1 HO motor that we don’t use that much since getting the boat. This spring I changed the oil and spark plugs and noticed it loses rpm and speed after riding for 5-10 minutes. When cold it will turn 10000+ rpm and burn 12gph at wide open throttle. Once warm, it drops down to 8500-9000 rpm at WOT burning 10-11gph. Sometimes it surges back and forth between full and reduce rpm, but mainly stays in the reduced range. I thought it was old gas and burned through that tank a few weeks ago. I put fresh gas in today but still got the same results.
Any ideas why it would do this only after warm up? I figured if it was a spark plug or a coil issue, it would do it all the time. Could oil level cause this issue? It looked right during the cold check on the trailer (at the L mark).
Thanks
Any ideas why it would do this only after warm up? I figured if it was a spark plug or a coil issue, it would do it all the time. Could oil level cause this issue? It looked right during the cold check on the trailer (at the L mark).
Thanks