83 Johnson 70HP OB hesitation/dead spot...

[alchik]

Hi,

I have an 83 Johnson 70hp Seahorse OB that has what seems to be hesitation/dead spot in acceleration. As I push the throttle forward I get to a spot where the motor just stalls and sometimes just stalls to the point of stopping. If I run it for a while I can get by it if I just push pretty quick past it (Stall point) then it jumps to life. Any ideas as to what this could be? Seems to run pretty good otherwise.

Thanks,

Al

 

[mikesea]

Re: 83 Johnson 70HP OB hesitation/dead spot...

your carbs are gummed up a bit and would need to be removed,disassembled,and cleaned throughly including all passages

 

[alchik]

Re: 83 Johnson 70HP OB hesitation/dead spot...

Would I just get a rebuild kit that would include gaskets and etc. then could I use auto carb cleaner on the parts?

Thanks!

 

[darrklim2]

Re: 83 Johnson 70HP OB hesitation/dead spot...

Would I just get a rebuild kit that would include gaskets and etc. then could I use auto carb cleaner on the parts?

Thanks!

Yes and Yes. Also make sure to clean all passages out with air or evena small wire to make sure there isn't any buildup in them.

 

[Brew2]

Re: 83 Johnson 70HP OB hesitation/dead spot...

The carb is the most likely culprit so hopefully a thorough cleaning as suggested above will resolve the problem. If not, start looking for an air leak somewhere in your fuel system (loose gas line connections etc.).

 

[HighTrim]

Re: 83 Johnson 70HP OB hesitation/dead spot...

Here is a good link if u plan on doing the carb. Is best to get a carb bath (dunking bucket with basket) to let your parts soak in for a few hours. Make sure to remove all rubber pieces first.

http://www.meegsonline.com/tmd/TMDsVideoChronicle2.wmv

 

[Darren418]

Re: 83 Johnson 70HP OB hesitation/dead spot...

You might also try doing a careful link & synch on the carbs first. That might clear it up without the rebuild...but most likely you'll probably end up having to do the rebuild.

 

[FastOrange]

Re: 83 Johnson 70HP OB hesitation/dead spot...

my 70 hp did the exact same until I figured out to give a quick hit of choke (without stalling it) before accelerating. This got rid of the problem instantly ever since.