Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

[daselbee]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Post #34. Bottom line. I almost guarantee it. (Maybe).

Never saw a spark tester like that. Is that white bracket plastic? Might work ok on a surface gap plug, but a plug with a bent ground electrode? And resistor plugs? I don't know....
The spark tester in my pic is adjustable, the plug wire plugs on one side, the other side has a clip to ground, and the spark jumps across the gap that you set by turning the red knob. The actual spark plug is out of the picture (not used).

 

[danoutbard]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Post #34. Bottom line. I almost guarantee it. (Maybe).

Never saw a spark tester like that. Is that white bracket plastic? Might work ok on a surface gap plug, but a plug with a bent ground electrode? And resistor plugs? I don't know....
The spark tester in my pic is adjustable, the plug wire plugs on one side, the other side has a clip to ground, and the spark jumps across the gap that you set by turning the red knob. The actual spark plug is out of the picture (not used).

Yours is nice one.

I Just did mine. All in plastic, using a plug with no electrode just to hold the cable properly.....and it works!

What is the impedance of a QL77JC4?

 

[danoutbard]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

In your diagram (above post #37) #4 is the slow speed jet(s) 2 to a carb... and #33 is the high speed jet(s) 2 to a carb. There are no adjustable needle valves on that model.

Thank you for the confirmation

 

[Tim Frank]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Post #34. Bottom line. I almost guarantee it. (Maybe).

Have you read post # 36?

 

[brasco]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

hey I dont know if this will help but i had a similar problem a while back. After I tried almost everything I took my johnson 115 4 stroke to a mechanic.

It turns out a cigarettepack celophane(sp?) flew out of my boat and the air intake sucked it up. immediately, the boat wouldnt do above 2200-2300 rpm but it ran like nothing was wrong. He cleaned out the celophane and it ran like a champ.

Hope thishelps....I know it was a very frustrating ordeal...

 

[FlaCowboy]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

emdsapmgr in post #17 says....> Have you taken the airbox cover off and visually checked to see if the carb butterflys are opening fully at max throttle? It is possible the sync and link is off. They should be flat (level) @ WOT.

I am in no way a mechanic but this makes sense to me.....Has this been checked?

 

[daselbee]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Tim Frank...not sure who you are referring to in your post, me or the OP.

But, he seems to be missing the point of my post, or is ignoring it...I dunno.

Last V4 crossflow I worked on had a cold port bank. The coils which bolt to the side of the head had been swapped after a head gasket change. #2 and #4 were sparking of course, but way out of time. It was backfiring like crazy, tho, something he has not mentioned.

Since he has just re-assembled this engine, and it seems he has the same symptoms....just swap the two spark plug leads and try it.

I swear I think he has the swapped coil problem.

My last post here. He seems to not be listening.

 

[bob johnson]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

sometimes the problems are soo simple you just cant believe that the cause......and to try and switch the wires is soooo FREE its crazy!!! ha ha ha.

myself i could not believ that i could mix up spark plug wires...BUT if the coils were switched.... Id resist the wire switch because of the length of the leads....not knowing it was the coils installed wrong


but it is kinda hard to think the motor would run all the way to 2200 rpms on only two cylinders though!!!

hopefully the OP give sit a shot


bob

 

[danoutbard]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Tim Frank...not sure who you are referring to in your post, me or the OP.

But, he seems to be missing the point of my post, or is ignoring it...I dunno.

Last V4 crossflow I worked on had a cold port bank. The coils which bolt to the side of the head had been swapped after a head gasket change. #2 and #4 were sparking of course, but way out of time. It was backfiring like crazy, tho, something he has not mentioned.

Since he has just re-assembled this engine, and it seems he has the same symptoms....just swap the two spark plug leads and try it.

I swear I think he has the swapped coil problem.

My last post here. He seems to not be listening.

Wait a minute, i m lost here !! you mean coil are dedicated to cylinder??? Like with numbers ???

Yes it does backfire, but not like crazy

Don't deny me plz we're almost there

 

[emdsapmgr]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

The wires from the power pack to the coils are color coded. That's so you don't get a coil firing on the wrong cylinder. On the older 90 hp engines with the dual power packs, the lower coil wire is solid orange. The upper coil wire is orange with a blue tracer. On the 1988 and newer 90 hp engines with the single power pack: The orange wires all have a tracer: #1 blue tracer, #2 green tracer, #3 purple tracer, #4 pink tracer. If you get any of these mixed/switched, two coils will have the plugs firing at the wrong time.

 

[daselbee]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Ah...so now he mentions the backfire....

Just switch the spark plug leads on the plugs. If it fixes it, then you need to address and fix the proper coil/orange wire location and go boating.

dude, I have been down this road before. Cold left bank, backfiring, rough running....

 

[metriccrescentwrench]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

you mean coil are dedicated to cylinder??? Like with numbers ???

Well..... what it comes down to is that the proper orange wire from the power pack MUST be going to the coil which fires the proper cylinder. In other words if it's an engine model from 1988 or newer, going by emdsapmgr's information, the orange wire with blue stripe must go the the coil which fires #1 cylinder, orange wire with green stripe must go to the coil that fires #2 cylinder, etc.

Yes it does backfire, but not like crazy

Hmmmmmm. That plus the fact that a couple of cylinders (I believe that's what you said before) are cool makes daselbee's theory sound even more likely.

 

[danoutbard]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Finally nailed it !!!!!!!!!!!!

Coil 2 & 4 were reversed thanks to a bloody wrong shematics:facepalm:



Can somebody confirm this shematic's wrong, blue orange plug 1 & 2 not 1 & 4


Thanks to all who helped me on this

 

[daselbee]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Yes!!! 2 and 4 are/were reversed. The schematic (looks like a Clymer) is wrong. Think of blue as sky (up) and green as grass (down) and you can figure out alot of the wiring. Regarding a 6 cylinder, orange/blue is the top one, and orange the middle, and orange/green is bottom.

Move that pattern to your 4 cyl, and you have orange blue on top, and orange on bottom, cause there is no orange/green.
I know, I know, it is kinda weird, but it has worked for years and years.

Beware of Clymer and Seloc.

Trim tilt is the same concept....blue is up, and green is down.

 

[Joe Reeves]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Strange... I said that on page 1, post 22. Guess it got overlooked.

 

[danoutbard]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Strange... I said that on page 1, post 22. Guess it got overlooked.

Yep you said it!!!

It's like "can't see the forest for the trees"

Thanks again

 

[danoutbard]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Yes!!! 2 and 4 are/were reversed. The schematic (looks like a Clymer) is wrong. Think of blue as sky (up) and green as grass (down) and you can figure out alot of the wiring. Regarding a 6 cylinder, orange/blue is the top one, and orange the middle, and orange/green is bottom.

Move that pattern to your 4 cyl, and you have orange blue on top, and orange on bottom, cause there is no orange/green.
I know, I know, it is kinda weird, but it has worked for years and years.

Beware of Clymer and Seloc.

Trim tilt is the same concept....blue is up, and green is down.

I like that concept a lot

Thank you

 

[Tim Frank]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Tim Frank...not sure who you are referring to in your post, me or the OP.

But, he seems to be missing the point of my post, or is ignoring it...I dunno.

Last V4 crossflow I worked on had a cold port bank. The coils which bolt to the side of the head had been swapped after a head gasket change. #2 and #4 were sparking of course, but way out of time. It was backfiring like crazy, tho, something he has not mentioned.

Since he has just re-assembled this engine, and it seems he has the same symptoms....just swap the two spark plug leads and try it.

I swear I think he has the swapped coil problem.

My last post here. He seems to not be listening.

The way i read the sequence of posts is that OP acknowledged that yourv diagram is correct....he had just misdrawn it....
Still, would only take a second to try your suggestion....

 

[daselbee]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

Well, now I am really confused....I never sent or posted any kind of diagram.

Let's put this one to bed...nighty night.


EDIT: Oh Oh...the "diagram" of the cylinder layout...ah I see......

 

[Tim Frank]

Re: Johnson 90 will not go over 2200 rpm at wot in the water after complete overhaul

....exactly....