help with 76 Johnson 70hp idles ... stalls on hole shot

[silvamark]

<br />Boat sat for 2 yrs. New battery & starter.<br />Added 8 oz bottle of OMC 2+4 fuel conditioner to<br />fresh 6 gal tank of gas.<br />I also drained line of old fuel before running.<br />The motor started after about 4 tries and idled<br />real nice.<br />When I put it in gear it stalled at first.<br />After I let it idle for a while it went into gear without stalling but only at idle speed.<br />When I try to punch the throttle the motor stalls and takes a few tries to restart.<br />Is this a fuel problem? <br />Do the carbs need to be cleaned because the old fuel setting in there for 2 yrs?<br />If so how do I go about cleaning carbs?<br />Does anyone know of a good howto manual for cleaning these carbs?<br />Or might the problem be something else I've over looked?<br />I'm puzzled because this motor ran perfect last time I had it out(sept 2000).

 

[norman158]

Re: help with 76 Johnson 70hp idles ... stalls on hole shot

get your manual out and clean the carbs sounds like the jets are all cruded up

 

[silvamark]

Re: help with 76 Johnson 70hp idles ... stalls on hole shot

thanks ... but I don't have a manual.<br />Do I really need a manual before I attempt to clean?<br />Or is there some sort of manual that comes with a carb kit or something?<br />I have sucessfully rebuilt a Holly 4 barrel carb with the kits you can buy.<br />Is there no need for a kit here ... just a good cleaning?

 

[MGuckin]

Re: help with 76 Johnson 70hp idles ... stalls on hole shot

Carb sounds varnished. Rebuild them.<br />Manual is a good idea.<br />Carbs are easy to do but there are some hidden passages that without the manual you might miss unless you know what you are looking for.<br />Kits are about $16 and contain most new internal components. You need 1 for each carb.<br />A manual cost about $30.<br />Also manual may be needed to reset timing linkage.