Mercury 35 hp approx.1994 - compression, prop?

[easten1]

Can anyone let me know what the compression should be for my 35hp Mercury. I think it is a 1994 model. Having trouble getting enough power to get up on plane. 13.5ft Quintrex aluminium with 2 adults & 2 kids on board.<br />Could be propellor ??? Motor runs & starts well, just not enough oomph...

 

[dkondelik]

Re: Mercury 35 hp approx.1994 - compression, prop?

'Mornin'Ian,<br /><br />Sorry, can't speak to the "new" compression spec BUT!,.... As a rule of thumb,you want to see all cylinders at 100+ psi with all reading within 10% of each other.<br /><br />What pitch are you running on your prop? <br />What is rpm at WOT? <br />Is this a new problem?<br />How long have you had this setup?<br />You may just be "over proped"<br /><br />Let us know what you find. Lots of really sharp guys here. I sure you'll be planing out in no time.<br /><br />Good Luck<br />HAVE FUN!

 

[easten1]

Re: Mercury 35 hp approx.1994 - compression, prop?

Thanks to Klondike7 for your response. Yes, we were over propped! Have changed from a 15 pitch to a 12 pitch and going well. Have had fun fishing and even managed to catch some!