[BrBoy]

Living in Norway, the labour rates at boat shops and machine shops run at around 160 bucks and hour so to be honest I'm reluctant to touch any more bolts on this motor. It came with the boat and was therefore relatively cheap used purchase. If it holds I am really in the mind to just run this baby until she dies a death. The labour to pull the head if that is required (which will almost certainly involve more broken off bolts from what I read of old Yams) will be greater than just buying a second hand late 90s motor if/when this one fails. That's one thought on my mind right now.

[PinkyCandice7x]

Ok will do - I'll try a little heat in them too but just a mild amount. more

[Guybrush]

Wd 40 isn't the best penetrate to use. PB Blaster (my preferred) or Liquid wrench penetrate would work better. here

[gaetaneelle24]

Some (not alot) heat to the block (heat gun) wouldn't hurt and some gentle tapping to the head of the bolt generally helps shock the stuck bolt. here

[jacobfan]

Help and advice appreciated! here

[Dekember]

The engines run cooler as salt water run them heated up to say automobile temps(say 205F) would tend to cause the salt to cook and passages to clog up with salt.. [links]

[Andreas Schildbach]

Tommy, is the thermostat in the same area as the water pump? I did a water pump years ago on an old 5 1/2 Johnson, and it wasn't a bad job at all. [links]

[gregharaksin3]

stat is in head and pump in lower unit
Service manual will be a great help

[canvasprint]

I shut it down, re-positioned the muffs, tried again with same results. Third time the tell tale and return both started putting out water. I figured the thermostat had not opened. I ran the motor for a few minutes and all was fine.

[Cynosure]

Re: Tell tale and thermostat on 1994 Yamaha 25 hp 2 cycle

[argos]

The tell tale is incoming water. Tell tales get clogged with junk or bugs. If it happens again take the hose off & blow it out.

[marie]

Thanks, guys. I think I'll do the pump and thermostat. Might save me a day fishing, not to mention a motor. [links]

[dennisouza12]

You must return items in their original packaging and in the same condition as when you received them. If you don't follow our item condition policy for returns , you may not receive a full refund. [links]

[reverselockup23]

Refunds by law: In Australia, consumers have a legal right to obtain a refund from a business if the goods purchased are faulty, not fit for purpose or don't match the seller's description. More information at returns .

[Pilot]

[ztristanmathisn]

[happyrock]

[Nomatra]

[links]

[cheggers]

Hello Guys,
I work to repair a yamaha outboard engine of a friend - it is a 3zyl 2 stroke 40HP - Type 40HET0.

[Argentum]

The Ignition timing is every time fix - approx 5 Degrees before TDC.
The changing of the Ignition time to earlier mode does not work. here

[William129]

This engine has following problem:
The eingine works - but only in idle mode.
I checked many things (carburettor, fuel pump, compression, thermostat..) until I found out:

[heather11duchon]

Generally classified as an after-market product, these Yamaha 40 horsepower repair manuals are easy to read and understand how to manuals written for the DIY do it yourself as well as the professional and well versed mechanics. The ease of understanding these manuals and their comprehensive nature is the greatest value of the manual to the owners for with the right combination of tools can facilitate and complete disassembling and assembling of an outboard motor. more

[xenfasa]

These are manuals that are made available by the manufacturers which give guidelines on servicing, maintenance and the repair of the outboard engine. These service manuals are not always made available to the end users but to dealerships of the outboards so that their mechanics can be able to fix the boat engine during and after warranty periods.

[cryptical]

Some other perks the Repair Manuals can facilitate are: more

[jomiller1017]

They however can guide a user to take apart and rebuild an outboard engine in a strip-down and rebuild manner. [links]