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    New to me 2020 Tohatsu 9.8 unable to go past 70% throttle, won't restart hot.

    Great advice gentlemen. I was able to complete the cleaning and reinstallation by the evening today. I'm pleased to report the engine now runs great, as the original owner had said. Turns out time flies, as he checked and it had last run in early April. This is a great forum. Everyone is...
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    New to me 2020 Tohatsu 9.8 unable to go past 70% throttle, won't restart hot.

    Yep, Houston we have a problem. Looks like the carb bowl was not drained, and some ethanol fuel must have been in the mix. I think when I started it, it probably sucked a bunch of gunk down in the jets. Of course, it may not have been run dry either, and the jets were clogged when I got it...
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    New to me 2020 Tohatsu 9.8 unable to go past 70% throttle, won't restart hot.

    Thanks for the response. I believe I will need to get the original owner's proof of purchase to go that route. I saw where the 5 year warranty would not cover instances where the fuel system is compromised by poor gas, or stale gas. I've never had to get warranty service from Tohatsu, so I...
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    New to me 2020 Tohatsu 9.8 unable to go past 70% throttle, won't restart hot.

    Engine is on a 1436LT Alumacraft jon boat with minimal mods, very light weight. 125 lb. boat, 81 lb. engine, and I'm 170. Three gallon tank. Seller says never had any issues at all. A little over 20 hours. Engine was last used two months ago, and supposedly had the carb run dry. Oil and foot...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    Thanks MattFL, I found my best price for the 8" on Amazon. It was about $60 shipped after tax with Prime. Boats.net has a good price as well, but they were not able to ship in a reasonable length of time. I got the first Solas (7") from Propeller Depot. They were nice to work with and...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    When I set up the engine on the boat, the short shaft and transom matched up perfectly according to manual. I agree that drag is likely my biggest issue. I'm considering that since my boat does not come out of the water, the bottom needs a good cleaning. I received the Solas 7.8 x 8" prop and...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    Yep, just me. Wife won't ride, so I'm trying to do the best with what I have. It is the largest lake in Alabama, and I'm the slowest boat on it. ;>).
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    MattFL, Thanks for taking the time to post the video, and your experiences. I could only dream of 17 mph on my boat, lol. Here is some more info garnered since my last post. BTW, I'm not sure if I'm quite fisherman enough to handle my nice catch being beheaded by another fish! Cool video...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    km1125, Sorry, I missed your reply. The boat is an Alumacraft 1436 jon boat. It weighs 130 pounds bare. My engine is about 57 lbs, myself 180 lbs, battery and trolling motor about 70 lbs, and tackle/rods around 15 lbs. So figure around 450-475 lbs ready to go. I have arranged the load for...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    Ready,Set,Boat responded to me and explained the difference in measuring from the rear of the carburetor and the venturi (narrowest point inside the throat of the carburetor). I compared the venturi size on the replacement carburetor to the 5HP carburetor that came on my engine, and it is in...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    Thanks for the response. Yes, I believe they sent me a 5HP carb, and am reaching back out to them. Their customer support is quite underwhelming so far. I would not purchase from them again just on this account. Additional fuel without addition air can only provide marginal additional...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    I went to my boat and removed the 'new' 6 HP carb I find that it has a 19mm venturi opening that is identical to my OEM Tohatsu 5HP Keihin carburetor 19mm venturi. It would appear that this is a 5HP carb, although there are absolutely no marking on the carb. The gaskets, and carburetor...
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    Converting Tohatsu 5hp to 6hp (4 Stroke) returns disappointing results.

    I broke in my 2021 Tohatsu MFS 5D and once done installed a replacement 6HP carb from Ready,Set,Boat. The boat is a 1436 Alumacraft Jon boat. It is lightly modified with an emphasis on light weight. Prior to the conversion to the new carb, the engine was running 5300 rpm WOT (Tiny Tach), and...
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