[boating1991]

Ski wont go faster than 8 mph and 4k rpm. Happened after having to go slow for 30 minutes in a reduced speed zone. Has good compression (125 both cylinders) and spark in both cylinders. Gas is fresh.

Any advice what to look at next?

 

[bpann1]

does it feel like it is spinning out

 

[boating1991]

Solved the problem above and wanted to post the solution in case someone else can benefit. The reason for the poor performance was the small gas filters in the carburator were totally blocked with debris. The debris had made it past the main filter. Cleaned the filters and ran fine.

I also installed another in line filter with a smaller screen size then the factory filter. Mechanic said that the debris was due to ethanol in the gas causing a reaction with the tank material. I emptied the tank and recovered alot of debris. Took out today and ran fine.... 50+ mph.

 

[bowmajl]

My gp1200 feels like it is spinning out - what would that mean?