4 cylnider 50 hp mariner 1984

[shawpdx1]

I bought this 4 cylinder 50HP Mariner is this built by Yamaha? wonder why so many cylinders? is this for quick take offs? anyone had one of these are they depenadable

 

[Faztbullet]

Re: 4 cylnider 50 hp mariner 1984

It is not built by Yamaha and its is a tried and proven inline 4 cylinder design made from mid 50's to late 90's and very dependable if maintained properly....

 

[shawpdx1]

Re: 4 cylnider 50 hp mariner 1984

shes been sitting for 15 years put poured 2 stroke mix down the cylinders and there all about 130 -140 and getting stronger

 

[shawpdx1]

Re: 4 cylnider 50 hp mariner 1984

was reading some of these were built by Yamaha up to 1984 only reason I asked

 

[scruffy_fish]

Re: 4 cylnider 50 hp mariner 1984

Check the engine numbers. That will tell you if it was made by Yamaha.

My 50hp also had no maintance for sometime, before I bought it.

I have the same motor and have done all the maintance myself. Went through the motor from rebuilding the lower unit seals, waterpump, and carbs to replacing a stator.

The four cylinders are good motors and run great.

 

[shawpdx1]

Re: 4 cylnider 50 hp mariner 1984

little worried about #3 cylinder its reading 130 the rest 145 - 150 psi

 

[shawpdx1]

Re: 4 cylnider 50 hp mariner 1984

Think # 3 is gone, when I put my finger over it not as much pressure as other 3 cylinders, wonder if its a stuck ring ........sprayed some W D 40 in hole, doubtful it will work. It does build up compression w/compression tester to 130 and holds over night though, any suggestions?