still feeling stupid

[jimcav]

1998 70 hp johnson<br /><br />well i think i tried everything. i will start with the compression test 2 cylinders are 110 and one is 115 know this test was done right after the motor was run, it was warm know can i still get good readings with the cylinders screwed up some how. the major problem is that the plugs are wet with oil after ideling on the hose for 5 to 10 min. i have totally disconnected the on board fuel supply so i am running premix from a separate tank. i have also rebuilt all three carbs and adjusted according to the manual. it also seems to idle ruff, it shakes around quite a bit and does not run smooth like my v6 mariner. <br /><br />if anyone has thoughts please respond i will entertain any idea.<br /><br />Thanks for all the help guys.

 

[jahughes]

Re: still feeling stupid

Hmm, just guessing here, but could you have a weak spark condition, resulting in not burning off all the fuel/oil mix? You might want to do a spark test.<br /><br />J

 

[jimcav]

Re: still feeling stupid

that a good idea i will check when dark but what could cause a weak spark usally it work or it dose not.

 

[jahughes]

Re: still feeling stupid

I'm not expert enough in repair yet to try and educate someone else on likely causes of weak spark, but there are numerous posts you can find with a quick search, or one of the masters might be able to add on their thoughts.<br /><br />A dark test I think is more for looking for sparking to ground outside the normal path, though that's probably worth doing, I was thinking more in terms of a nice hot spark jumping across a good gap.<br /><br />Here's a post with some info on spark checking:<br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=034989#000001 <br /><br />Don't hold it near your plug hole though, it will be spitting fuel/oil and you don't want to torch that off on accident...<br /><br />J