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  cmc bracket on 15' stripper

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Author Topic:   cmc bracket on 15' stripper
HookedOnHer posted 07-16-2001 05:25 PM ET (US)   Profile for HookedOnHer   Send Email to HookedOnHer  
I HAVE A 79 15'STRIPPER W/80 70HP EVINRUDE THAT I WANT TO IMPROVE PREFORMANCE. I KNOW A SS WILL HELP BUT I AM ALSO LOOKING AT A CMC MANUAL BRACKET. MY SET-UP NOW IS A ALUM. PROP WITH A WEDGE BETWEEN THE TRANSOM AND MOTOR BRACKET(REMEMBER THE OLDER OMC MOTORS NEED MORE ANGLE AT TRASOM BECAUSE OF BAD DESIGN WITH REGARDS TO BOTTOM HOLE).
MY QUESTION IS WILL I STILL NEED THIS WEDGE WITH NEW CMC BRACKET. FYI, I CONTACTED CMC AND THEY MAKE THEIR OWN WEDGE THAT WILL FIT ALOT BETTER THAN THE ONE NOW.
MY SECOND QUESTION IS MY HOLE PLACEMENT ON TRANSOM NOW DOES NOT MATCH-UP WITH THEIRS. REMEMBER MY WEDGE, THE TOP TWO HOLES MATCH-UP WITH MOTOR BRACKET BUT THE BOTTOM TWO TRANSOM BOLTS DO NOT GO ALL THE WAY THROUGH. I MEAN THEIR IS NO BOLT ON BACK SIDE OF MOTOR. COULD THIS MEAN THE BOLT GO THROUGH TO THREADS NOT SEEN BETWEEN TRANSOM AND BRACKET. I GAVE SPECS ON HOLE PLACEMENT TO CMC AND HE SAID I WOULD HAVE ENOUGH ROOM TO DRILL TWO MORE BOTTOM HOLES IN BRACKET TO MATCH-UP. I DON'T WANT TO DRILL NEW HOLE IN MY TRASOM. ANY COMMENTS ARE WELCOME.
Bigshot posted 07-16-2001 05:31 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Wow, lot to digest. Are you saying the bottom engine bolts are lag bolts into the transom? If so you have to remove them and raise engine on transom so you can install through bolts into the well. You have to moon the washers so they fit flucs on bottom of well. This will eliminate a lot of resistance and speed you up. Will also be stronger. The filled in bottom bolts, you won't even see. Lag bolts should definately not be used with a plate. Any others comments/experiences?
HookedOnHer posted 07-16-2001 05:50 PM ET (US)     Profile for HookedOnHer  Send Email to HookedOnHer     
BIGSHOT, SORRY ABOUT THE BOOK. ANYWAY I HOPE THERE IS LAG BOLTS THERE NOW OR I ONLY HAVE THE TOP TWO HOLDING THE MOTOR TO TRANSOM. HAS ANYONE COME UPON THIS. I REALLY DON'T WANT TO DRILL ANY MORE HOLES IN TRANSOM IF I CAN HELP IT.
counterstrike posted 07-16-2001 05:59 PM ET (US)     Profile for counterstrike    
TnT or Jack Plate?

I'm in the same boat lol, realy. I have the same boat and will be adding the cmc TnT on my 70, and if your engine is like mine (short shaft) then the motor will have to be lifted to allow the bottom bolts to be used if your not using the cmc bracket THEY MUST BE USED or you could find your self paddling back to port.
Once you get your bracket it should be no problem using the existing bolts/ holes.

jward posted 07-16-2001 06:07 PM ET (US)     Profile for jward  Send Email to jward     
I have a one Piece CMC manual jack plate I will sell if anyone is intrested (used 1 year). I had issues with too much weight in the stern and put my boat on a diet, I took the jack plate off, and relocated the batteries.

HookedOnHer posted 07-16-2001 06:13 PM ET (US)     Profile for HookedOnHer  Send Email to HookedOnHer     
HERE IS SOME MORE INFO, THE MOTOR IS IN THE TOP HOLE SETTING NOW. IT LOOKS LIKE THE ORIGINAL OWNER HAD MOTOR IN THE BOTTOM HOLE WICH HAD THE MOTOR 2" HIGHER IN SAME HOLES IN TRANSOM. THIS WAS BEFORE WEDGES WERE ADDED.
Bigshot posted 07-16-2001 06:14 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
How much?
HookedOnHer posted 07-16-2001 06:40 PM ET (US)     Profile for HookedOnHer  Send Email to HookedOnHer     
COUNTERSTRIKE, GLAD TO SEE YOU HAVE GOOD TASTE. I ALREADY HAVE TNT, SO ALL I NEED IS THE JACK. I THINK,BY WHAT YOU SAID I AM GOING TO TRY IT. WHAT IS YOUR TOP SPEED NOW.DO YOU HAVE A SS PROP. I HAVE GOOD TOP END,ABOUT 38MPH. I HAVE VERY POOR HOLE SHOT, FEELS LIKE I AM PULLING SKIERS.
SuburbanBoy posted 07-16-2001 06:51 PM ET (US)     Profile for SuburbanBoy  Send Email to SuburbanBoy     
I have installed a jack plate on my 15' Striper. It is a T&H brand if I remember correctly. I drilled two additional holes in the transom side of the bracker, to allow for the two lower holes "non-standard" locations. One thing I must say, the motor (70hp Tohatsu @250lbs.) does not slide easily up and down. It requires some tapping to drop it down, and a little muscle to jack it up. And that is with loosened lock bolts on each side.

To prevent this on your boat, I suggest that you just snug up all of the bolts prior to final tightening. And, remember to silicone seal the transom fastners. Good luck.

sub

counterstrike posted 07-16-2001 07:23 PM ET (US)     Profile for counterstrike    
Jward could you gimmie an E on this item?
mailto:fmbfla@iline.com
counterstrike posted 07-16-2001 07:25 PM ET (US)     Profile for counterstrike    
Hooked,
Boats in process of being redone, :-(
I hope to get it wet soon though.
Bigshot posted 07-17-2001 10:22 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Hooked. had a 83 15 CC and a 90 70 Johnson. No plate a nd a 21" SST Prop. The best I have done was 46.8 on the GPS. 38 is slow for that.
HookedOnHer posted 07-17-2001 01:53 PM ET (US)     Profile for HookedOnHer  Send Email to HookedOnHer     
Bigshot, I know I have some work to do with prop pitch....motor height,but I believe your 70 has more hp than mine does because of the age and rating of hp. I would love to get 46.8 mph out of mine, but I believe it might be out of reach.
Whaletosh posted 07-17-2001 02:05 PM ET (US)     Profile for Whaletosh    
Sealing the transom bolts it important as SuburbanBoy states. but you shouldn't use silicone. Silicone contains acetic acid which is corrosive to aluminum. The acid will penetrate the paint and attack the motor mount. Stick with polyurethane sealants like 3M 5200.

Sean

Bigshot posted 07-17-2001 02:12 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
hooked. Understandable but my 79 with a 1975 70hp did over 40 and when I repowered to a 84 60hp 2cyl it did like 43(less weight). You should be like 42 and I think it has a lot to do with your height. I assume you are running a 19" prop.
where2 posted 07-20-2001 10:18 AM ET (US)     Profile for where2  Send Email to where2     
My '85 15' Sport with '85 70Hp Johnson W/PT&T turning 13-1/4"x19" OMC SS (with cupping). Runs 47+mph. Hole shot is kinda poor, (tinkering with vent holes to cover that). Low 40's is what it runs with the 13-1/4"x17" Alum prop (which is what I use for slalom skiing).

Anyone wanna rebuild my carbs this weekend?

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