aquarius23
New member
Hello,
I have this motor on a 14 foot grumman GSS. The motor runs great, starts really good, idles good, good power. The boat and motor seems to like to cruise right at 21 to 22 mph, top speed was 30. May have gone faster but that was fast enough for me. I filled the fuel tank up and marked a dowel rod with the level so I could fill again to that mark and measure the amount of fuel used. I ran at cruise speed (21 to 22) for 1 hour. GPS on my phone showed I had gone 21.8 miles. When I refilled the fuel tank it took 2.5 gallons of gas. That figures out to be 8.72 miles per gallon. That seems like a lot of gas to burn for 21.8 miles. Maybe I am wrong, I do not know. What do you all think?
The compression is 130, 132. The main jet in the carb is a 59 which I think is correct. Low speed jet works as it should, rich/lean no problem. Float level is good and the needle and seat work as they should. I set the link and sync as shown on a few you tube channels. I do not have a manual for this motor yet and at 8.72 mpg I will get rid of it before I buy one.
My 9.9 Honda on this boat cruise is 10 mph and top speed 15.7 at 22 mpg. I know apples to oranges but that is what I have to compare.
Any thoughts on how to improve the mpg. Thank You.
I have this motor on a 14 foot grumman GSS. The motor runs great, starts really good, idles good, good power. The boat and motor seems to like to cruise right at 21 to 22 mph, top speed was 30. May have gone faster but that was fast enough for me. I filled the fuel tank up and marked a dowel rod with the level so I could fill again to that mark and measure the amount of fuel used. I ran at cruise speed (21 to 22) for 1 hour. GPS on my phone showed I had gone 21.8 miles. When I refilled the fuel tank it took 2.5 gallons of gas. That figures out to be 8.72 miles per gallon. That seems like a lot of gas to burn for 21.8 miles. Maybe I am wrong, I do not know. What do you all think?
The compression is 130, 132. The main jet in the carb is a 59 which I think is correct. Low speed jet works as it should, rich/lean no problem. Float level is good and the needle and seat work as they should. I set the link and sync as shown on a few you tube channels. I do not have a manual for this motor yet and at 8.72 mpg I will get rid of it before I buy one.
My 9.9 Honda on this boat cruise is 10 mph and top speed 15.7 at 22 mpg. I know apples to oranges but that is what I have to compare.
Any thoughts on how to improve the mpg. Thank You.