Why does my 91 70hp run on2 cylinders some time?

[Javelin 353]

1991 70 hp Johnsons occassionally will not run on middle cylinder, have taken it to mech 2xs' New PP, colis , wires and plugs, also said high speed jet cracked middle cylinder. Used boat ran great stopped about 20 min refired only run 3200 rpms then will limping in it picked up and ran fine. I am really at a loss for this It is getting very frustrating 34- month problem, scared to go to the big lakes around me.

 

[Javelin 353]

Re: Why does my 91 70hp run on2 cylinders some time?

How do you delete a post??

 

[tashasdaddy]

Re: Why does my 91 70hp run on2 cylinders some time?

you're forgiven this time. if the high speed jet is cracked replace it. how can it get proper fuel.

 

[Javelin 353]

Re: Why does my 91 70hp run on2 cylinders some time?

It was replaced but still have problem I think it is electrial as squeezing bulb makes no difference?

 

[Silvertip]

Re: Why does my 91 70hp run on2 cylinders some time?

When it's missing you need to check for spark on that cylinder. No spark - ignition problem. Good spark = fuel problem. Compression check is also in order. If a decarb has never been done that's in order as well.

 

[Javelin 353]

Re: Why does my 91 70hp run on2 cylinders some time?

pulled plug wires while doing it one time #2 NO spark at all top good ,bottom weak?

 

[tashasdaddy]

Re: Why does my 91 70hp run on2 cylinders some time?

seeing that the engine faq is not up go to 'boatpartstore.com' click in trouble shooting the to catergory.