Need help on compression

[P1]

Hi i'm P1 i have 45 classic fifty 4 cyl 1986 model and it does't want to start now some one told me to check compression and i checked it cyl1 120pci cyl 2 120pci cyl3 120pci cyl4 120pci it's there some thing wrong.

Thanks and regards help is more than appriciated.P1

 

[ingydrummer]

Re: Need help on compression

Well, your off to a good start. Now that you know the compression, its time to check fuel delivery, and electronics

 

[whyboats?]

Re: Need help on compression

those compression figures are great. any internal combustion engine needs spark, fuel and air to run. a quick check is to spray a shot of starting fluid into the carb. if it fires, you have spark. if it doesn't fire, you probably have a fuel problem. I would only recommend a quick shot only one time as a test. unless you have oil injection, the motor won't have any lubrication for a second or two. this is a basic starting point. good luck.

 

[P1]

Re: Need help on compression

Hi thanks for your help but i don't know what to do more all fuel line are new carb clean spark it's coming on all plug tested with spark tester new fuel.The problem is when i take off cyl1 spark plug it starts but at high speed when i put the spark plug back it does not start.I don't know what to do else

Thanks very much for your help very appriciated.P1

 

[JB]

Re: Need help on compression

Go to the Engine FAQs Forum P1. Do "Outboard won't start".

Let us know what you find.

 

[P1]

Re: Need help on compression

It is possible to be the fuel pump thats not working.Thanks