1979 140 wont' stay running

[evilwind1]

Greetings again to all! I recently got a 21' Cobia with a '79 140 on it . Got it started for about 5-10 seconds ( with gas squirted in) and it would cut right off. If I held the choke on it would stay running longer (rough) but would then cut off probably by fouling plugs. I changed the fuel pump because it was leaking even after rebuild gaskets but still the same. The guy at the marina told me even though I was putting on a new fuel pump that it was probably the hi speed jets that were clogged ( engine had been sitting for a while). My question now is can I run some carb cleaner through the lines or do I have to take the jets out and clean them? Someone told me that if you hold your hand over the carb throat that it will force the carb cleaner into the jets to clean them out ( sometimes works well). Also do you have any diagrams of the carb that I can go by to rebuild? Thanks in advance, Bill.

 

[ondarvr]

Re: 1979 140 wont' stay running

You need to pull the carbs off and clean them, they need to be taken apart and carb cleaner and air blown through each orifice. Its not hard to do and won?t take very long.

 

[evilwind1]

Re: 1979 140 wont' stay running

Thanks , that's what I'm going to do, I just needed to hear it from a pro!

 

[Thaybot2000]

Re: 1979 140 wont' stay running

When you pull the carbs, notice that there is a "punch out" that is sealed with gasket type material. Your carb rebuild kit should contain replacement punch outs. You need to remove these as this will give you access to the inner passages of the carb, then soak and blow air through.

 

[emdsapmgr]

Re: 1979 140 wont' stay running

I'd also recommend a couple of addtitional things during your carb overhauls: That you spray an aerosol carb cleaner through the carb bodies during cleaning. This carb cleaner is a good way to dissolve any dried fuel from the passages. Spray one passage in one carb, then do the same passage on the other carb. Watch the spray coming out of the carb and make sure the spray exiting one carb passage matches the spray coming of the the same passage on the other carb. If they are clogged, they will have different spray patterns. You should remove each jet to inspect it visually for debris or restrictions. [The jets require a special screwdriver to get them out.] The idle passages only work at idle-(when the butterflys are closed) they are very small and need to be extremely clean for the engine to idle properly.