1976 6hp johnson compression

[caseycl65]

Hey guys I have a 1976 6hp johnson that will not start. I checked the compression and get 50 on each cylinder. I thought this might be a little low? I checked both spark plugs and they spark. I sprayed wd40 in the cylinder holes and compression stays the same. The engine does not fire at all. What do you do from here? Thanks for all your help.

 

[ob]

Re: 1976 6hp johnson compression

Sounds a bit low on compression , but being that they are both the same and taking into consideration that the guage may or may not be calibrated,notwithsatnding cranking rpm,I'd be inclined to gues that compression is not the issue.Have you verified whether your getting fuel or not.Fouled carburetors are at the top of the list on two stroke outboard repair issues.<br /><br />For reference , the plug leads should jump a 7/16" gap to ground at cranking speed to be considered firing correctly.<br /><br />To help rule out a possible fouled carb you could spray some premix into the carb throat and see if she'll try to fire off.

 

[caseycl65]

Re: 1976 6hp johnson compression

Thanks for the quick response. I tried wd40 in the carb and still did not get any indications of firing. The engine was not run very often, maybe five times a year. How do I verify whether I am getting fuel? Should i take a look at the carburetor? I do believe the plugs are firing correctly they really fire well. Thanks again!

 

[Pony]

Re: 1976 6hp johnson compression

I would try spraying some premix into the cylinders from the spark plug hole and see if it will fire that way (I have a spray bottle that I keep in the garage for the mix)...........If it does fire up than you know you are dealing with a fuel related issue. Most likely a blocked carb passage or fuel line............<br /><br /><br />Make sure you use a 50:1 fuel to oil mix.........DONT use starting fluid. It has no lubrication properties and you will only cause harm.

 

[ob]

Re: 1976 6hp johnson compression

Do the plugs appear wet after several failed attempts at starting engine?They should if you're getting fuel to them.If not ,you're fuel starved.Try the premix fuel for testing.Not WD40.

 

[caseycl65]

Re: 1976 6hp johnson compression

Thanks for the tips. The plugs are wet after my attempts at starting. when I pump the primer bulb too much the fuel runs out of the carburetor. I will switch to premix thanks. How much do you spray? Fill em up?

 

[ob]

Re: 1976 6hp johnson compression

From your last post it sounds as if the engine may be flooded.When you pump up the primer bulb it should eventually get firm and push no more fuel.This will insure that the needle valve in the carburetor is seating.If the bulb never gets "completely" firm,it is an indication of a problematic needle valve/sticky float.

 

[caseycl65]

Re: 1976 6hp johnson compression

Still could not get the motor to start. Just took the carb apart. It has some jellied looking gas in the bottom. I am currently cleaning the carb. Looking into the powerhead where the carb connects it looks as if some of the bad gas might be in near the reeds. Should I just clean the carbs or take it apart and clean everything? Are there other things that should be cleaned since I found jellied gas?

 

[ob]

Re: 1976 6hp johnson compression

Go ahead and finish the carburetor dismantling and cleaning of all fixed orifices.Soak the carb body good in carb cleaner and use indexed torch tip cleaners or similar tool to free any solid buildup in orifices and ports and then follow up with a good flush with compressed air if you got it.Air in a can is the next best.Might be a good idea just to install a new carb kit.I'd remove and clean everything easily accessible in getting the gummy deposits out.Especially if it's gummed up enough to affect reed seating.