60hp johnson dies over midle speed

[123ed]

I have a 1967 60hp Johnson Super Sea Horse,vxl-13-a.she run good at 1/3 of the speed at higher speed dies under load.I have rebuilt the carb,and the fuel pump replace the spark plug no improvment when run at full throottle it will go for a few second,and stop to accelerate. If anyone has any suggestion I will appreciate it Thanks

 

[ross patti]

Re: 60hp johnson dies over midle speed

Welcome 123ed,<br /> I'm only fairly new here myself,but if you can give as accurate a description as possible,it will get your problem fixed quicker.the more info,the better.<br /> Post with a bit more detail,and I'm sure help won't be far away.<br /> Good luck...

 

[123ed]

Re: 60hp johnson dies over midle speed

thank rosco 11<br /><br /><br />the motor is runing good at low speed,but will not go faster, when accelerate the motor as a good power just for a few second and will cut down to approximately 1/3 of the motor speed.The adjustment for the low and high speed do'nt chage anythingt the hose and the gaz container was change the primer ball is always hard.It is deficult to identified if it is the gaz or the fire.thanks .

 

[fireman57]

Re: 60hp johnson dies over midle speed

Check for spark when it bogs. Sounds like you are dropping a cylinder due to a bad coil. If you lose spark to one cylinder swap the coils and see if the problem follows before you go throwing cash at it.

 

[Marauderk]

Re: 60hp johnson dies over midle speed

I had the same problem with a 77 70 hp and turned out that the coils would get hot and not put out the correct power and after i replaced them it ran perfect.

 

[Mnemonic]

Re: 60hp johnson dies over midle speed

May be the timing as well. Do a link & sync

 

[123ed]

Re: 60hp johnson dies over midle speed

thanks every one for your messages.After 2 weeks of works i still have the same problem.first a changed the rotor it was for a magneto system with a wider metal on the end.I removed the flywheel to check the woodruff key broken or damaged,the key was in good condition. the mark on flywheel was not time with the no 1 cylindertop dead center (TDC) the no 1 cylender j<br />ust start to moved down with the timing mark on the flywheel .We backup the flyweheel 1-1/2inches <br /> to have the piston dead center changes the coil and all the hoses.Synchronizing the distributor and the the carburetor.changes the gas tank and the primer skueeze bulb.The float arm in the carburator was bent up to be parallel with the cover surface. it same to have a blue smoke when ajusting the low speed needle.with all these changes we din't see any improvement on the midle n high speed.any more sugestions thanks.