1983 Evinrude 70 stalling with easy acceleration

[Mattedhead]

I am finishing up a restoration on a boat I purchased this winter. The motor is an 83 70hp non-VRO. When I first purchased the boat, it was difficult to get the boat to speed without bumping the choke...then once on plane things ran fine. I rebuilt the carbs and fuel pump, replaced the fuel lines and plugs. Next time out I seem to have gone from fuel starved to flooding. If I slowly increase the throttle the engine will cut out; however, if I hammer it to WOT it jumps out of the water and runs fine. I was thinking that the throttle linkages need to be sync'd or possibly that the linkage is sticking? I am very new to this and have learned what little I know from a Clymer manual and friends who have some knowledge. The boat previously did not have a tach but I am finishing up the re-rigging and have installed one for diagnostic purposes. Any information that you guys might have would be greatly appreciated. I should have it back in the water this weekend, and was planning to de-carb w/ Deep Kreep.

Thanks-
Matt

 

[jtexas]

Re: 1983 Evinrude 70 stalling with easy acceleration

welcome to iboats! Sounds like you did a good job on the motor so far - your symptoms might indicate the link & sync needs to be tweaked. clymers & seloc are really too general about that process on most specific models - best to get the OEM manual...it will pay for itself over and over. but it could just be that your idle RPMs might be a bit low. should be around 750 with the boat in the water in forward gear - it can be on the trailer or tied to the dock, but you can't really set idle speed in the driveway.

try marineengine.com or kencook.com for the manual.

and post some pics of your project in the 'restoration' forum.