74 6hpwont start

[bassman88]

I have a 74 johnson 6hp can not get it tocrank,ihave replacedthepoints,condensers,coil,newplugs&wires.ialso did acompressiontest on it is 65on both cyld.rebuild carb to.i am get gas to the bottomplug,but not the topplug.any help thxs

 

[crxess]

Re: 74 6hpwont start

Have you verified good(blue) Spark?
Does your pump ball get hard when pumped and stay that way?
Have you tried spraying a little pre-mix into the carb to start it?

I just got my 6hp running last week.
Carb was dirty, trash blocking main jet
Points were way to tight.
Once these 2 things were corrected and the fuel pump confirmed ok, it fired right up.

 

[tashasdaddy]

Re: 74 6hpwont start

rad this, good info for you, http://forums.iboats.com/showthread.php?t=299680

 

[bassman88]

Re: 74 6hpwont start

thanks for the info got goodspark the primerbulb does not stay hard .but it will run aslong as you pump the bulb.

 

[bassman88]

Re: 74 6hpwont start

thanks or the link

 

[crxess]

Re: 74 6hpwont start

thanks for the info got goodspark the primerbulb does not stay hard .but it will run aslong as you pump the bulb.

Fuel pump is bad - may be leaking into lower cylinder.

Side note: were you on the Sierra boards? nascar forums?

 

[jtexas]

Re: 74 6hpwont start

thanks for the info got goodspark the primerbulb does not stay hard .but it will run aslong as you pump the bulb.

yup, perforated fuel pump diaphram leaks into the crankcase, floods the bottom cylinder.