25hp Tohatsu help

[fishincop640]

Hello everyone.  I have a 25hp tohatsu that is 3 years old....has been running well all season.  Went out the other night and it was running great for awhile then just started losing RPM's...the motor wasnt missing, just felt like I was towing a house...I checked the plugs, checked the tank for water......anything I may be missing?   It's also putting out a lot of white smoke.  But like i said, it isnt missing or cutting out.....just wont idle or run like it is supposed to.

[Fishing Rhino]

Are you sure the "white smoke" is not steam? An engine that loses power so that it feels like it is "towing a house" sounds like a motor that is possibly overheating.  An engine that is overheating begins to slow or lug just before it seizes.

Was the motor showing the telltale stream which indicates the water pump is working? If so, then it could be a faulty thermostat causing it to overheat.

If it is steam, it could be a blown head gasket allowing water into the combustion chamber.

Either one can ruin an engine in a short time. Best to have it checked by a qualified tech.

[choupique]

I am assuming this is an EFI 4 stroke motor please correct me if I am wrong.  Did you have an alarm and the red LED light illuminating.  If so were they on steady or pulsating.  If your motor was overheating or had low oil pressure one of these alarms should warn you and the computer should cut the RPM of the motor until the problem is corrected.

[fishincop640]

It's only a two stroke.  The water was shooting out of the top at a steady stream.  It very well could have been steam because it was odorless.   I haven't been able to look at it since Sunday so I'm going to look at it Tuesday when I get off of work.  I finally got a set of the muff things so I don't have to keep running my boat to the lake every time I try something different.  My cousing, who is a certified mechanic, said he would look at it yesterday and today but totally blew me off like always.   Ill keep everyone posted.   I did take the llittle plastic reservoir off inside and it did appear to have some water in it.  As of Sunday I was getting a "poof" sound out of the exhaust every once in awhile. 

[fishincop640]

Well,  motor (25hb tohatsu 2 stroke) is still giving me fits.  Replaced the fuel pump and the coil and the motor is still crap!  I can hook it up to the water muffs and it runs fine!  I get it in the water and it just craps out on me.  I've noticed last night that the motor wouldn't idle up like it used to and also when I put it in "forward" it sounds like the motor just chokes itself out.  The water stream out of the top of the motor also wasn't as constant when idleing....when i would idle it up with the hand throttle it would start a steady stream......I was told maybe a CDI ?? box or a statter box 'er sumthin like that?   Any help would be appreciated

[CFFF 1.5]

Is your motor carbed or EFI. If it is carbed I would recommend getting the carbs cleaned out. I have a Tohatsu 2004 30hp 4-stroke that would act the exact same way when I first got it (used). It had sat for a while and the carbs were gummed up. When I would start it on the muffs it would start really easy and run pretty good, but as soon as I put it in the water it didn't want to start. I finally got it to start but it would stall as soon as I put it into gear. check those carbs if you have them.

Also should the motor still be under warranty if it is only 3 years old?

[fishincop640]

I didn't get any warranty info with the motor....I actually bought it from my cousin....kinda like a 3rd party deal so im sure the warranty was up or something....I think it has a carb....it has a manual choke and an air intake...how would I know if it is EFI?  I have to pump the ball on the fuel line once in awhile so would that make it not EFI?  I've heard that the ethanol gas is playing hell on the engines and to use higher grade gas and Stabill.....

[B-Dozer]

It should have a single carb. Like it was mentioned you should clean it for starters. How's the gas? Mixture correct? If you look in the gastank w/o shaking it, see if there are any "blobs" on bottom. That would be water. If it's the ignition (it has a CD ignition) it might not act up until it's warm. You said you checked the plugs, what did you see? Don't waist your money on higher octane, not necessary. But it has to be clean. Lets see what you can find. Good luck.

[CFFF 1.5]

Mine has three carbs one for each cylinder. Yes ethanol can be bad but only when it sits for a while it will create condensation in your gas tank. You can use a water seperator or you can just use all the gas or completely fill up the tank after each trip or if you use the boat on a fairly consistent basis don't worry about it. I replace whatever is left in my gas tank about every 6 months. If I haven't used the boat in a few months I will dump the remaining gas into the tank on my truck. It would probably be best to take the engine to a certified mechanic unless you can clean the carbs your self. If you have more than one carb you will need tools to sync the carbs after you are done cleaning them.

[CFFF 1.5]

Also, always run all the gas out of the engine after each trip. You can do this at the ramp by unplugging the gas line and letting the engine run out of gas or you can do it at home on the muffs. I usually do it at the ramp but sometimes due to time constraints I will do it when I get home. This will cause the engine to start harder the next time you go take it out but that is just because the engine is completely empty of all fuel.

[B-Dozer]

Mine has three carbs one for each cylinder. Yes ethanol can be bad but only when it sits for a while it will create condensation in your gas tank. You can use a water seperator or you can just use all the gas or completely fill up the tank after each trip or if you use the boat on a fairly consistent basis don't worry about it. I replace whatever is left in my gas tank about every 6 months. If I haven't used the boat in a few months I will dump the remaining gas into the tank on my truck. It would probably be best to take the engine to a certified mechanic unless you can clean the carbs your self. If you have more than one carb you will need tools to sync the carbs after you are done cleaning them.

You have three carbs. on a two cyl. 25 horse? The repair book I have says one carb. It also shows premix, not the best thing to put in your truck.

[CFFF 1.5]

Mine has three carbs one for each cylinder. Yes ethanol can be bad but only when it sits for a while it will create condensation in your gas tank. You can use a water seperator or you can just use all the gas or completely fill up the tank after each trip or if you use the boat on a fairly consistent basis don't worry about it. I replace whatever is left in my gas tank about every 6 months. If I haven't used the boat in a few months I will dump the remaining gas into the tank on my truck. It would probably be best to take the engine to a certified mechanic unless you can clean the carbs your self. If you have more than one carb you will need tools to sync the carbs after you are done cleaning them.

You have three carbs. on a two cyl. 25 horse? The repair book I have says one carb. It also shows premix, not the best thing to put in your truck.

If you read my post I have a 2004 30hp 4-stroke. So no premix and the 30hp 4-stroke is a 3 cylinder.

[B-Dozer]

Mine has three carbs one for each cylinder. Yes ethanol can be bad but only when it sits for a while it will create condensation in your gas tank. You can use a water seperator or you can just use all the gas or completely fill up the tank after each trip or if you use the boat on a fairly consistent basis don't worry about it. I replace whatever is left in my gas tank about every 6 months. If I haven't used the boat in a few months I will dump the remaining gas into the tank on my truck. It would probably be best to take the engine to a certified mechanic unless you can clean the carbs your self. If you have more than one carb you will need tools to sync the carbs after you are done cleaning them.

You have three carbs. on a two cyl. 25 horse? The repair book I have says one carb. It also shows premix, not the best thing to put in your truck.

If you read my post I have a 2004 30hp 4-stroke. So no premix and the 30hp 4-stroke is a 3 cylinder.

If you read HIS question it's a 25 horse 2 stroke

[B-Dozer]

fishingcop 640 here's a pdf file on tohatsu 25 horse outboards. www.tohatsu.com/tech_info/own_man_pdfs/Toh25c2_30A3.pdf might have to type it in. Good luck

[fishincop640]

Thanks everyone.....I have an internal gas tank and can not look inside it at all....ive never really run it so it would have been sucking off of the bottom of the tank or something like that.....how do I clean the carb?  Just carborater cleaner?  do I just spray it on there or what?   Im clueless when it comes to these things!

[CFFF 1.5]

Mine has three carbs one for each cylinder. Yes ethanol can be bad but only when it sits for a while it will create condensation in your gas tank. You can use a water seperator or you can just use all the gas or completely fill up the tank after each trip or if you use the boat on a fairly consistent basis don't worry about it. I replace whatever is left in my gas tank about every 6 months. If I haven't used the boat in a few months I will dump the remaining gas into the tank on my truck. It would probably be best to take the engine to a certified mechanic unless you can clean the carbs your self. If you have more than one carb you will need tools to sync the carbs after you are done cleaning them.

You have three carbs. on a two cyl. 25 horse? The repair book I have says one carb. It also shows premix, not the best thing to put in your truck.

If you read my post I have a 2004 30hp 4-stroke. So no premix and the 30hp 4-stroke is a 3 cylinder.

If you read HIS question it's a 25 horse 2 stroke

I am very aware of his question, I was trying to provide insight into his problem by detailing the problem I had with the same brand motor even though they are different.

[CFFF 1.5]

Thanks everyone.....I have an internal gas tank and can not look inside it at all....ive never really run it so it would have been sucking off of the bottom of the tank or something like that.....how do I clean the carb? Just carborater cleaner? do I just spray it on there or what? Im clueless when it comes to these things!

I would recommend you take the engine to a certified outboard mechanic and let them diagnose the issue for you. You will need to remove the carb(s) from the engine and clean out the jets.

[choupique]

In the original post you said you have a 3 year old Tohatsu 25 then you said you have a 2-stroke.  I don't recall Tohatsu making a 2-stroke carbed 25 in 2007.  I have a 2007 Tohatsu 25 that is a 4-stroke EFI, I may be wrong about yours but as I said I don't recall.  Please look on the data tag on your motor and get the year and model number so that the members here can better help you.