Merc '94, 40 HP ELPTO, Max RPM's?

Kamper · 07-11-2011, 08:03 AM

Merc '94, 40 HP ELPTO, Max RPM's?

After a couple years in storage I thoroughly prepped my boat and took the family for some rides on Lake Winnisquam, last week. The motor sounded well but did not hit the speeds I expected and seemed quieter than I expected at full throttle. Some of my passengers were a bit heavy but I've had similar loads in the past.

Fresh fuel. New hoses. Filters are clear (see through). Connections are tight. No crap in carb bowls. I'm planning on selling the boat so I've been spending a lot of spare time on it. The family tours were just a fringe benefit of that work. It was not just a "shake off the cover and go" prep.

I'm going to hook it to a test-tach and adjust some of the settings. Does anyone here know the maximum RPM's for this model of motor?

Thanks in advance!

LIforrelaxin · 07-11-2011, 10:03 AM

Found this link which has the information you are looking for:

http://www.piranha.com/Mercury_Outboards.php

Remember that the WOT, is under load, so this needs to be done with the boat in the water.

Out of curiosity, what type of boat?

Kamper · 07-11-2011, 11:23 AM

Thanks! That's exactly what I needed.

I have a 55 gallon barrel that I can use for the stress test. First I'm going to veirfy the mixture at a moderate setting. Then I'll adjust the max RPM blocks.

The boat is an '83 Starcraft SSC 150. That's a tin, split console, run-about. I think the boat did better than I did. I made a few newbie handling errors but after an hour it was all coming back to me.

NHBUOY · 07-11-2011, 12:05 PM

Kamper, make sure that drum is anchored in place (ie:cornerered in garage with boat backed up "tight" and a constant water supply)..40hp at WOT with a prop (not a test wheel) is a mighty powerful thing...when was the last time you ran some Sea Foam through it.?..happy tuning..

Kamper · 07-12-2011, 09:49 AM

Oh yeah. I've used the drum before. Slip it empty over the drive, straighten out the l/u to vertical, fill the drum at least half-way. That's 200 lb.s. It has never moved. I tape a hose over the pisser to recycle that water too.

I changed-out the water jacket and exhaust gaskets before storing it 2 years ago. No build-ups to worry about. I rebuilt the carbs at the same time, too.

07-11-2011, 08:03 AM	#1
Kamper Senior Member Join Date: Jul 2005 Location: Thornton's Ferry Posts: 1,306 Thanks: 67 Thanked 171 Times in 127 Posts	Merc '94, 40 HP ELPTO, Max RPM's? Merc '94, 40 HP ELPTO, Max RPM's? After a couple years in storage I thoroughly prepped my boat and took the family for some rides on Lake Winnisquam, last week. The motor sounded well but did not hit the speeds I expected and seemed quieter than I expected at full throttle. Some of my passengers were a bit heavy but I've had similar loads in the past. Fresh fuel. New hoses. Filters are clear (see through). Connections are tight. No crap in carb bowls. I'm planning on selling the boat so I've been spending a lot of spare time on it. The family tours were just a fringe benefit of that work. It was not just a "shake off the cover and go" prep. I'm going to hook it to a test-tach and adjust some of the settings. Does anyone here know the maximum RPM's for this model of motor? Thanks in advance!

07-11-2011, 10:03 AM	#2
LIforrelaxin Senior Member Join Date: May 2006 Location: Texas, Lake Ray Hubbard and NH, Long Island Winnipesaukee Posts: 2,871 Thanks: 1,037 Thanked 892 Times in 524 Posts	Found this link which has the information you are looking for: http://www.piranha.com/Mercury_Outboards.php Remember that the WOT, is under load, so this needs to be done with the boat in the water. Out of curiosity, what type of boat? __________________ Life is about how much time you can spend relaxing... I do it on an island that isn't really an island.....

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The Following User Says Thank You to LIforrelaxin For This Useful Post:
Kamper (07-11-2011)

07-11-2011, 11:23 AM	#3
Kamper Senior Member Join Date: Jul 2005 Location: Thornton's Ferry Posts: 1,306 Thanks: 67 Thanked 171 Times in 127 Posts	Thanks! That's exactly what I needed. I have a 55 gallon barrel that I can use for the stress test. First I'm going to veirfy the mixture at a moderate setting. Then I'll adjust the max RPM blocks. The boat is an '83 Starcraft SSC 150. That's a tin, split console, run-about. I think the boat did better than I did. I made a few newbie handling errors but after an hour it was all coming back to me.

07-11-2011, 12:05 PM	#4
NHBUOY Senior Member Join Date: May 2005 Location: Loon Mtn. winters...Meredith Neck summers Posts: 398 Thanks: 288 Thanked 94 Times in 60 Posts	Kamper, make sure that drum is anchored in place (ie:cornerered in garage with boat backed up "tight" and a constant water supply)..40hp at WOT with a prop (not a test wheel) is a mighty powerful thing...when was the last time you ran some Sea Foam through it.?..happy tuning..

07-12-2011, 09:49 AM	#5
Kamper Senior Member Join Date: Jul 2005 Location: Thornton's Ferry Posts: 1,306 Thanks: 67 Thanked 171 Times in 127 Posts	Oh yeah. I've used the drum before. Slip it empty over the drive, straighten out the l/u to vertical, fill the drum at least half-way. That's 200 lb.s. It has never moved. I tape a hose over the pisser to recycle that water too. I changed-out the water jacket and exhaust gaskets before storing it 2 years ago. No build-ups to worry about. I rebuilt the carbs at the same time, too.