Take the cylinder head off now.-----Lucky you if it is a blown head gasket.----There is no need to go 100:1 on a motor in good condition.----Bad idea !!
There you go again making assumpions based on poor information and reading.----It is NOT based on a 40 HP motor.-----And changing a carburetor does not turn a 25 into a 40 HP.-----Good luck with your endeavors !
You look at parts and automatically post that you think they are no good / poorly designed.----They built a lot of motors and those 25's are just wonderful !
Not much point in adding oil to the fuel !!-----This is a direct injected motor.-----Agreed , parts support for modern motors is pitiful.-----Too much outsourcing for parts.----Contracts for parts do not exist once shelf is bare.----Costs too much too make short parts runs.-----Easier to get...
I used to do this for about $1000.----But today it is difficult to even find a shop interested in doing this type of repair.----Most might quote you about$4000 + I think.----A rebuilt powerhead is an option.----I see a listing for a powerhead at $2500 or so.----Requires you to install ignition /...
It appears to me that the top piston ring is GONE.----Time for 4 new pistons and rings I think !!!----Picture of the tab on top of cylinder head on the other side ?