4.5 hp trouble

[renoduckman]

I have a 1979 4.5 hp Merc that was sitting for years. I totally cleaned the carb and installed a new impeller. It starts now and pumps water fine but it seem to bog down. After awhile it speeds up and dies. I suspect the fuel pump? Does anybody have any other ideas? Also, does this engine have points or some type of cdi? Any ideas will be helpful. Thanks Joe

 

[Saskatoon2005]

Re: 4.5 hp trouble

Can you please give me a serial number so I can help you....thanks.

 

[Saskatoon2005]

Re: 4.5 hp trouble

It contains an ignition module and a high speed coil. Check this out...<br /><br /> http://www.crowleymarine.com/mercury_parts/469/4.cfm <br /><br />This gives you a picture of what is under your flywheel. I will find more info for you. If it is the same as my 7.5 merc then I can help you out better.

 

[Saskatoon2005]

Re: 4.5 hp trouble

BEGINNING IGNITION TROUBLESHOOTING <br /><br />Always attempt to proceed with the troubleshooting in an orderly manner. The shotgun approach will only result in wasted time, incorrect diagnosis, replacement of unnecessary parts, and frustration.<br /><br />Begin the ignition system troubleshooting with the spark plugs and continue through the system until the source of trouble is located.<br /><br />The test equipment listed in this section is a MUST when troubleshooting this system. Stating it another way, "There is no way on this green earth to properly and accurately test the complete system or individual components without the special items listed."

 

[Saskatoon2005]

Re: 4.5 hp trouble

Hey give me your email address and I have some diagnosis paperwork I can send you. I have lots of info for your engine so contact me a.s.a.p...

 

[renoduckman]

Re: 4.5 hp trouble

The serial number is 5397758. The carb was varnished from sitting so long and the impeller was bad. Those were no brainers

 

[renoduckman]

Re: 4.5 hp trouble

I will give it a try this weekend. My fuel line and bulb are old so i need to replace them. Might be getting air in the line