Hello,
I have a 1989 Johnson 110 2 stroke on an 18' VIP. It will not go faster than 6 mph. In previous years it would do 30 mph. At the end of last summer it was running rough so a local shop replaced the reeds and went through the carbs. It ran like a top after that. It has a new prop and lower unit, compression is 105-110 on all cylinders and has good spark. In neutral, it will rev up and fuel pressure increases appropriately so I think the carbs and fuel diaphragm are still working as they should. In gear it will only accelerate to 6mph. As I continue to throttle up over 6mph it begins to vibrate. We replaced the lower unit this week thinking that was the cause of the vibration to no avail. Any ideas what could cause the lack of power or any other diagnostics I can check?
Thanks in advance!
I have a 1989 Johnson 110 2 stroke on an 18' VIP. It will not go faster than 6 mph. In previous years it would do 30 mph. At the end of last summer it was running rough so a local shop replaced the reeds and went through the carbs. It ran like a top after that. It has a new prop and lower unit, compression is 105-110 on all cylinders and has good spark. In neutral, it will rev up and fuel pressure increases appropriately so I think the carbs and fuel diaphragm are still working as they should. In gear it will only accelerate to 6mph. As I continue to throttle up over 6mph it begins to vibrate. We replaced the lower unit this week thinking that was the cause of the vibration to no avail. Any ideas what could cause the lack of power or any other diagnostics I can check?
Thanks in advance!