TheFoosh Posted November 18, 2016 Share Posted November 18, 2016 Hi All, I have a 3.7m AllyCraft tinny with a 9.9hp 2-stroke Tohatsu. Boat goes well, get on the plane even with 3 people in it. Any ideas how I can eke a tiny bit extra performance from the motor? It is essentially a 15hp restricted to 9.9hp. Not sure if there is an easy fix to remove a restrictor plate or swap a carbie from a 15hp model? I eventually plan to swap for a 20 or 25hp but until then happy to tinker with this motor. Motor is currently set to the correct height with the anti ventilation plate in line with the bottom of the transom. Any tips or tricks appreciated. Nick Link to comment Share on other sites More sharing options...
JA1990 Posted November 21, 2016 Share Posted November 21, 2016 i think it would be more then just 'restricted' the bore and stroke would be completely different. My best suggestion is sell your 9.9 to buy a 15. Link to comment Share on other sites More sharing options...
jeffb5.8 Posted November 21, 2016 Share Posted November 21, 2016 (edited) Unlike the other outboard companies the Tohatsu is not a de-rated 15hp, so at best you can change props for more top end. I would sell and upgrade to the newest motor you can afford or are will to spend or keep the 9.9hp until she dies and enjoy. Edited November 21, 2016 by jeffb5.8 Link to comment Share on other sites More sharing options...
TheFoosh Posted November 23, 2016 Author Share Posted November 23, 2016 Thanks guys, it's running perfectly fine so I'll keep it and make the most until it becomes too small to cope. Link to comment Share on other sites More sharing options...
jeffb5.8 Posted November 24, 2016 Share Posted November 24, 2016 I had the same issue on my old boat, started with a 6hp which was ok with one person but anymore and it was too slow, so i upgrade to a 15hp and it made a big difference, then since it was faster i took more people, so the boat became to small, So i upgraded the boat in length and a 25hp and that was a lot better again. it never stops apparently, its a bit of a sickness Link to comment Share on other sites More sharing options...
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