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Author Topic:   Repower 2000 13ft. Sport
coastal whaler posted 01-18-2004 08:26 AM ET (US)   Profile for coastal whaler   Send Email to coastal whaler  
Hello, I just repowered my 2000 13ft. Sport with a 2004 40HP 4-Stroke Mercury motor. It orginally came with a 25HP Mercury Bigfoot motor. The dealer installed the prop off my 25 Bigfoot to the 40. I just went from the slowest take-off on the block to the quickest. My GPS speed at 6000RPM is 30 MPH. From what I have read the 13 should approach 38 MPH with this motor. One thing I like is I can go from idle to 5000RPM in two boat lengths. I need to reach plane quickly because I am usually fishing shallow saltwater bays. Does anyone know what prop Boston Whaler installs on the 40HP 4-Stroke with the 13 Sport. Any help is appreciated. Thanks, Coastal Whaler
jimh posted 01-18-2004 12:17 PM ET (US)     Profile for jimh  Send Email to jimh     
You probably need a propeller with more pitch. Be very careful not to run your brand new engine at excessive engine speed, especially during the break in period.

Your dealer should have advised you better regarding propeller choice and warned against running the engine at 6000 RPM during initial use.

Buckda posted 01-18-2004 01:11 PM ET (US)     Profile for Buckda  Send Email to Buckda     

Go online to Michigan Wheel's Web site (don't have the url handy) and fill out their replacement propeller calculator and give them a call on Monday morning.

I have a 15' Sport with a 70 HP Evinrude. The boat came with a "square" prop...13" diameter and 13" pitch. Hole shot is/was incredible, but you'll be much happier with a higer pitch. I moved to a 13" X 19" aluminum Michigan Wheel. The hole shot suffered (it is no longer explosive, but I would still say it's exceptional) but I got the engine under control as far as appropriate RPMs at max speed, and the top end/cruising speed was significantly improved.

I still keep the old pros as a spare, and suggest you do the same. That prop you have right now would be great for pulling skiers, etc because it will give you quite a bit of low-end power, but is probably not the best general use prop for your current setup.


coastal whaler posted 01-18-2004 01:51 PM ET (US)     Profile for coastal whaler  Send Email to coastal whaler     
Thanks for the information. The Mercury booklet I received with the motor said to run full throttle for 1 minute every 10 minutes the second hour of operation, while not going over 4500RPM the rest of the time varing the RPM's. The 1st hour never to exceed 3500RPM varing the RPM's. I did not punch it from idle until the 4th hour and for only a couple seconds. It seems like a completely new boat with the 40 after running the 25 for 3 years. Thanks again, Coastal Whaler
lhg posted 01-19-2004 04:04 PM ET (US)     Profile for lhg    
You might go to the prop selector at if you're running on a PC. I would get an SS prop, either Vengeance or the new 4 bladed Trophy Sport. 15" pitch could be about right?
coastal whaler posted 01-20-2004 05:02 AM ET (US)     Profile for coastal whaler  Send Email to coastal whaler     
The 15 in. pitch sounds like it should be pretty close. I have an 11 on there right now. I prefer aluminum prop due to if I hit a reef or rock I will damage the prop and not the prop shaft or worse. Since 1978 I have tore up 3 or 4 props but have never bent a prop shaft. Running Texas back bays you just never know. At 5000 RPM I am going 25 MPH GPS speed. I would like to get that to around 28 at 5000. I figured I could run it all day at 5000 if I wanted to. What RPM would you suggest running a motor that turns 6000 RPM. I have always felt the easier you run a motor the longer it will last. Thanks for the input, Coastal Whaler
coastal whaler posted 01-25-2004 12:45 PM ET (US)     Profile for coastal whaler  Send Email to coastal whaler     
I called Boston Whaler customer service and got the correct answer to all my questions.(they were very helpful) The correct aluminum prop is a Black Max 10 3/8 with a 14" pitch. When installing the Mercury 40 HP 4-Stroke you need a spacer between the motor and the transom.(otherwise the drain hole is blocked. I found out the hard way and had to un-bolt and remount the motor) My Mercury dealer had wedges that are 3/4 in. at the top and 1/8 at the bottom. He said these were negative trip wedges. This allows for quick plaining and will cure any porpoising problem. The motor is bolted in the second hole from the top. All was installed yesterday and I took it for a test run. The boat plained at 3200 RPM.(unbelievable after running the 25 for 3 1/2 years) At 4500 RPM I was going 26 MPH.(a perfect cruising RPM and speed) The motor would reach the 5500-6000 Rpm range when I trimmed the motor up. I hope this will help anyone who would like to re-power with a 40 4-Stroke, but cannot get a dealer to install due to the 2000 model hull rating at 30 HP.(not sure I understand why it was rated lower than the 2001 model and up) Thanks for this forum, Coastal Whaler

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