macdrai
15.05.2021 19:15:44
Maybe still an issue with carb or the choke. Could also be ignition advance I suppose. I’m not familar with that specific engine so you might want to talk to tohatsu or a local service center. more
See full version: Tohatsu outboard problems
Maybe still an issue with carb or the choke. Could also be ignition advance I suppose. I’m not familar with that specific engine so you might want to talk to tohatsu or a local service center. more
I have a 50 tohatsu 2 stroke on a 16 foot Jon boat at full throttle the motor sends out an alarm that makes me return to idle wait a few seconds then is good to go again. Can run 3/4 throttle all day long some say could be rev limter
3. I have seen motors cutting out or bottoming out before maximum speed because of restrictions in the fuel supply. Once it was a small piece of rubber in the float bowl that wasn’t a problem at half throttle with a low fuel demand, but when the throttle was opened wide it would restrict the fuel leaving the bowl. The rubber had presumably come from the hose to the tank. here
We have an older tahatsu 40horse,outboard 2 stroke,probably mid90s. it won’t shift into fwd gear but will go in reverse,,any ideas? Did a little work on it,now it ,will shift with the lower unit off into fwd,,put lower unit back on same thing. any ideas or suggestions? here
I will look into the chokes but the bulb DOES get firm when squeezed. Not to sound even more naive, but is there a choke associated with this engine even though it is fuel injected?
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Not to suggest you're as naïve as I was, but does the key-operated choke work—that is, when you push on the ignition key, does it engage? You can watch it with the engine cover off to see. There's a solenoid on the starboard side of the block that pushes the choke linkage when electrically energized by the key switch. If not, have you tried the manual choke on the front of the engine cowling? If you pump the bulb, does it get firmer, or does it stay soft?
Oops, you're right, if FI there would not be. I wasn't paying attention to the "SX", which mine is not. Sounds a bit like a failed crank position sensor to me, but I'd expect it might still run, albeit poorly. Hopefully someone else can help!
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Thank you for your comments. If you have anything further to ad, please do. here
Besides having a drastic reduction in emissions over a carbureted 2-stroke, the TLDI ® motors provide a significant reduction in fuel consumption. TLDI ® outboards provide several other advantages over carbureted 2-strokes such as:
Is TLDI ® a reliable technology? [links]
In 1998, the U.S. Environmental Protection Agency (EPA) issued new regulations governing the emissions of outboards sold in the United States. The purpose of these regulations is to reduce the pollutants created by outboard motors. In short, the EPA regulations mandate that all outboards meet certain emission requirements by the year 2006. Outboard manufacturer’s are using a variety of technologies to reduce the emissions of their outboards including 4-stroke and direct injection 2-stroke technologies.
I worked with tohatsu on the height of the mount. no difference. I measured it and it ended up only being about 1 and 1/4 inch lower than stock.
I have a new theory. The engine cranks and runs fine if it is a given that it is supposed to vibrate like it does. It produces just a little less power at the prop than the old engine. everyone I have talked to including tohatsu says that 4 strokes run just a slight bit weaker than a comparable 2 stroke. What if this engine just ended up accidentally having the jets for a 4hp version instead of 6 hp version installed. there is no physical difference in the 4hp/5hp/6hp engines other than how the carb is jetted. It would be consistent with everything that has been said and observed. [links]
Got back with tohatsu yesterday and they are stumped. They think the boat is two big for the engine and that is why the rpms are running 1200 rpm under nominal . Nominal being according to them 5500 rpm. They are sending me free of charge a 6 pitch prop to test and see what that does. They agree that I am not getting 6hp at the prop if im not getting 5500 rpm but I can tell they want to say it is because the boat is to big/heavy.