only runs while choking

[myusername]

I have a 1978 johnson 70 hp, and when it will start, it only runs while choke is pushed in. Any ideas what I should do about that? Will cleaning the fuel filter help this?

 

[boobie]

Re: only runs while choking

Sounds more like you need some carb work. But check your compression and spark first.

 

[bigriver79]

Re: only runs while choking

I would bet the low speed jets are clogged, at the least. Agree with Boob.

 

[myusername]

Re: only runs while choking

Any tips on finding these low speed jets? I've been through the manual pretty thoroughly, and don't remember anything about those.

 

[Daviet]

Re: only runs while choking

# 27 is your idle orifice, don't forget to check the passages under the core plug, # 5.
http://www.ishopmarine.com/ishop/js...CatFilter=BRP&eCatSupFldr=supplier-100-005-EJ

 

[myusername]

Re: only runs while choking

Will spraying some carb cleaner in there do the trick, or do you think some major carb work is what will have to happen?

 

[Daviet]

Re: only runs while choking

Spraying carb cleaner into the throat of the carb will not clean any of the internal passages or the orifices inside the carb.
To clean it properly you must take it apart and make sure to remove all orifices and sure all passages are clean.

 

[myusername]

Re: only runs while choking

That's what I was afraid of. I think I've had it out maybe 3 or 4 times since I had the carb gone through, so it might be time for me to try to do it myself. Thanks for the info.