bullhuss - 96 Johnson 115 oceanrunner - After Long Lay Up Questions

[Mikey N.C.]

What's the compression on cylinders.?

 

[bullhuss]

Hi guys, Chris's advice worked ,, it is now starting first turn of the key Thanks Chris. But it is running very rough missing and backfiring when idling' when I try to up the revs it bogs down , when it dose revs it runs fine and will take the trottle . I have all the air mix screws sat at 5 3/4 turns it is letting fuel back through the carbs at times any ideas guys. Just wondering if its getting too much fuel as some times i have to use the primer to start it.

 

[Chris1956]

Did you do a link and synch on that motor? Also, check to make sure the carb or other throttle linkage is not sticking, as the return spring can be wimpy.

 

[bullhuss]

Hi Chris, the spring is fine as I fitted a new optic censer so I greased all the moving parts and checked all was working. One thing I have noticed is when I give it prime it revs and runs fine till I turn the primer off this has me thinking its not getting enough fuel in some cylinders so would adjusting the air / fuel mixture screws to give it more fuel help. Don't understand link and synch means sorry lol . At least were up and running just have to have patents . have to get a tank monday as not enough pressure in the muffs to run for a long period of time

 

[racerone]

The primer valve puts fuel into the engine when key is pushed in or the with red lever in the open position.------This fuel bypasses the metering circuits in the carburetors.-----This suggests that the carburetors need attention.

 

[bullhuss]

Hi Racerone, I have cleaned the carbs twice and they are spotless the float is leveled the gaskets are good the jets cleaned and no leaks. If I put my hand to the inlet of the carbs when the motor is running the fuel will build up you can see it flowing off the center of the carb so there is plenty fuel I only need the primer to start when cold it will start first turn after that I was thinking of checking the reed valv's what do you think

 

[Chris1956]

It is doubtful the reed valves are the issue, as she runs with the primer on. I would suspect an air leak in the carb base gaskets, throttle body gaskets or the idle cover gaskets, or some dirt still in the idle passages.

When I installed the "spaghetti" seals on the carb base, I had to move and wiggle the carb to get it to seal in the groove. That was after I stuck them in with permatex. Ditto for the throttle body seals.

 

[Chris1956]

Link and synch is where you synch the carb opening with the idle timing and set max timing. It is likely necessary after you replaced the optical eye.

 

[racerone]

I guess post # 25 was a waste of my time again.

 

[bullhuss]

Hi Chris, I put new gaskets in when I replaced the trottle body's I held the gaskets in place with Vaseline and the gaskets on the face of the carbs that meets the trottle body's I put a very thin bead of gasket maker to hold and help seal them I will check the seals on the side of the trottle body . Also when this back fires it flames through the carbs not a lot but a quick flash this don't happen often . Can you explain in more detail about Link and (synch ?? ) I did not do this after replacing the optic censor .

 

[Chris1956]

You really should have a factory service manual. The link and synch is explained in detail there.

Also, you might do a search for a link and synch by Joe Reeves. He had posted it on this forum, some time ago. It might be in the stickies.

 

[bullhuss]

Thanks Chris, will do'' I will let you know the outcome. by the way this is the model no HJ115SLEDR

 

[bullhuss]

Hi Chris , still the same I opened the air / mixture screws eight turns it started and ran but very rough and cut out' the only way it would stay running is to palm the air intake on the carbs . when I do fuel start to flow back against my hand .....Gone half demented at this stage ' any taught's on this

 

[bullhuss]

What the spec's for the compression on this motor

 

[Chris1956]

Idle timing on a 1998 60* 115V4 is 4* ATDC. Max spark advance is 20* BTDC.

Your timing should be close to that. If you haven't set it, this would be a good time.

 

[bullhuss]

Will do, this can be done without the motor running as this wont stay running hope to do it tomorrow but with virus on the move we are on lock down since 6.00 this evening .

 

[racerone]

Post # 21 mentioned / asked about compression !-----No response on that question on your part.

 

[Chris1956]

Bull, the service manual uses a special ignition tool to set timing, with the engine off. Unfortunately, it looks to be OMC service tech only.

Joe Reeves posted a practical method to time Johnnyrudes. Maybe it will work for you.

A service manual is still a good idea, so you will know where to make the timing adjustments. Lockdown will not prevent you from ordering a service manual. The marineengine dot com web site may have one for your model motor.

 

[bullhuss]

Thanks mate, I was looking at his method it seems to be for the older motors ..The timing marks on the click linkage's are very vague the are no numbers or settings just little teeth I was reading some where it said not to move the out side teeth will order a manual will get back to you to let you know how I got on

 

[oldboat1]

got to be a record. 57 posts to list a model number. 64 posts to decide a manual might be helpful.