72 100hp evinrude- slow starter

[dstom]

Yes, I know that this motor is 40 years old, but I can remember when it was "introduced".

Anyway, I am trying to bring it back to life. It has not run in 3-4 years (as a result of a personal health incident). When I started this project, there was absolutely nothing happening (except being able to activate the choke). I have worked through the starting circuit, including rebuilding the starter motor. With the spark plugs removed, it turns over "ok" (maybe a little slow). But with the plugs installed, it turns over very slow-- to slow to start. The cyclinders have been sprayed with fogging oil. What should I do next? (If there is a previous thread on this, please direct me). Would it be ok to run the starter (with plugs removed) for a minute or two, maybe 2 or 3 times?

Also, should I try starting it with only 2 plugs, not all 4? I know it might run rough, but it is NOT going in the water until it is dependable.

Lastly, I know I have to change the LU oil. Should that be done before or after I get the motor started? I was planning on after, but would old oil there create an extra load on the starter?

Thanks for all your help and advice!!

 

[ezmobee]

Re: 72 100hp evinrude- slow starter

Make sure you use the correct (Type C) oil in the lower unit. No, old oil won't effect your starting.

 

[Piece715]

Re: 72 100hp evinrude- slow starter

The carbs will prob have to be rebuilt... not sure if that's your problem but sitting for so long they are prob all gummed up

 

[dawinksta]

Re: 72 100hp evinrude- slow starter

im having the same problem with my 1975 50hp after sitting 4-5 years. let me know if you fix it!

 

[emdsapmgr]

Re: 72 100hp evinrude- slow starter

That engine has to turn over at least 200-250 rpm when cranking for the stator to fire the ignition system. Make sure you have a good battery, that the solenoid will transfer the required current and that the battery connections are snug. As an alternative, you can jump the starter direct from a fresh battery.