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  60 hp yamaha setup on 15ft sport

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Author Topic:   60 hp yamaha setup on 15ft sport
crbuckjr posted 04-29-2002 05:22 PM ET (US)   Profile for crbuckjr   Send Email to crbuckjr  
I am putting a 60 hp 2 stroke Yamaha on a 15 ft Sport. I am new to this. Any advice, cautions, instructions, etc that I should give to the person doing the installation?
Clark Roberts posted 04-30-2002 07:40 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I would advise you to mount up at least two holes on motor bracket and install a "Doel-Fin". With the right SS prop (one that lets the engine rev to about 5600rpm at wide open throttle {WOT} with light load) it should be a rocket! Happy Whalin'.. Clark.. SCN
jimh posted 04-30-2002 07:51 AM ET (US)     Profile for jimh  Send Email to jimh     
Clark,
Is the Whaler 15-foot hull one of those models that has problems with the lower engine mounting holes?

On my 15-Sport (back in 1976 when the engine was installed) it looks like the lower mounting holes have been drilled at an angle so that on the inboard side of the transom they are located just above the bottom of the motor well, and on the outboard side of the transom they are in a lower position where they line up with the engine bracket holes.

I never understood why they were installed on an angle until the issue of cutting into the bottom of the motor well to install the lower bolts came up (see http://continuouswave.com/whaler/cetacea/cetaceaPage53.html ).

Assuming you had a untouched transom and a new motor, how would you locate the bottom holes on a 15-Sport?

crbuckjr posted 04-30-2002 09:39 AM ET (US)     Profile for crbuckjr  Send Email to crbuckjr     
Clark

Is a Doel-Fin a horizontal fin that helps keep the bow down during a fast start? I am assuming you think adjusting the tilt won't be enough to accomplish that?

crbuckjr posted 04-30-2002 09:39 AM ET (US)     Profile for crbuckjr  Send Email to crbuckjr     
Clark

Is a Doel-Fin a horizontal fin that helps keep the bow down during a fast start? I am assuming you think adjusting the tilt won't be enough to accomplish that?

Clark Roberts posted 04-30-2002 03:26 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Jim, yes the transom well is too shallow to allow std. mounting hole pattern (at least for the bottom two bolts.. best to drill the top holes in std. location (about 1 1/2" from top of transom) and locate the bottom holes two up. Mount the bottom engine bracket holes and then the top holes will be in second hole... puts engine up two holes net! Good location... a set back bracket or jackplate can accommodate the non-std hole pattern just fine as you can redrill bottom two holes in jack plate... etc..etc... Yes the Doel-fin is a horizontal fin (s) which attach to anticavitation plate and helps stabilize most boats and especially a 15 with 60/70 hp which likes "air time" with only a small pad of hull in contact with water when opened up and trimmed out! The fin will give you a little extra margin of safety... I'm running a 70hp (71 cubic inch) 3 cyl Merc on my 15 and it's a real handfull at WOT and needs the fin as there is virtually NO hull in water! Better clip on that kill switch lanyard!!!! happy Whalin'... Clark.. Spruce Creeeeek Navy
Clark Roberts posted 04-30-2002 03:32 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Forgot to mention that some (most) engines have a pair of "blind" tapped holes in the bracket to allow a bolt to be inserted from inside transom well when needed. This is a much preferred arrangement to the often used (by dealers/service) lag bolt solution. I would never use lag bolts as they will not hold if you hit something solid or have to use crash reverse... also they will let water intrude. Use of the blind holes, however, preclude any further height adjustments via mounting holes! SCN
crbuckjr posted 04-30-2002 03:46 PM ET (US)     Profile for crbuckjr  Send Email to crbuckjr     
Clark

thanks a lot for your help

Chuck

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