Thank you, this was my basic plan for my engine don't want anything crazy as I want to be fairly reliable as I use it fishing and hunting regularly. Maybe I'm wrong, but I didn't think 100 was really doable without some porting. I know somewhere in one of the threads I found specs of the sst 60 tuner and some pics of someone else's they made but can't find it now. Being that they are hard and expensive to come by I'd probably just mod/make mine to sst60 specs. Does anyone know the specs? length, width of opening, pics always help.
find 3 of these
http://www.ebay.com/itm/SMA5169-Evin...19.m1438.l2649
mill front half to get within .050" from rod caps.
get 1-1/2 x 1-1/4 venturi carbs, 1990 & up 50's have them.le tuner
add 2" in length to sst style tuner
match ports like mod 70 did ad chamfer top of exhuast port 30deg 1/16" is very mild
Dang now you have me confused on the tuner lol so add 2" to sst 60 tuner? Wouldn't that make it more like a stock 70hp tuner. I thought the stock 70hp tuner was longer than the sst60 tuners. Thanks for the tip on the reed cages I only planed on cleaning mine up and running CCMS reeds.
get some pics and look. cut off stock and get some square tube and make a cowbell.
as far as intake you are giving up a lot there................
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Thanks for the advice on the ports and reed cages I think I will be keeping my eye out for more of those etec ones. The advice is very much appreciated I've had plenty of experience working on and building engines in cars, but haven't delved much into modifying outboards so the advice is appreciated. I've read through mod 70's build thread it was very helpful as well. I get the idea on the tuner is to go for a cowbell shape I keep looking around for the thread where someone posted up the length of the tuner. So right now I'm think stick with the length of the 70 tuner just make it look like a cowbell sst60 tuner.
Small World 90hp etec triple tuner right in the middle.
There is a to of theory behind the geometry but it is a good picture .........................................
Last edited by MODIFIEDOUTBOARD; 08-24-2017 at 05:43 PM. Reason: Cowbell Like this one
I understand what you mean by the cowbell shape and I finally found the thread that had the inlet and outlet size specs of the sst 60 tuner barried in fast freds mod 50 secrets page 76
http://www.boatracingfacts.com/forum...hread-2/page76
inlet on exhaust base plate 1 1/2" x 1 3/4" outlet 2 3/8" x 2 3/8" what over all length works best in a long shaft mid is what I'm trying to figure out now. I've got a tig welder so welding up my own tuner isn't an issue trying to come up with ball park specs for when I finally get to tearing into my spare engine.
I would not be surprised if I was. That was several years ago and the complete process took about an hour. The owner had the outfit there for a bad cdi box. They had the motor on the dyno to test the new box. They were talking about the small carbs. I happened to be there working on our SST 60 race boat. The owner of the marina wondered if the 60 carbs would make a difference on that motor. I had my break in motor 60 carbs with me that is why I knew they had 75 jets. They took off the original carbs and I put on my 60 carbs. That was all we did. We did not do any more and the motor ran fine.
Regardless of what year you did the carb swap and dump test the info is much appreciated. Modifiedoutboard what the heck etec are those reed cages off of been trying to back search the part numbers off the ad to see what engines they were on with no luck.
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