93 Johnson 200 gt stalls under load

RDenno

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Joined
Jul 30, 2012
Messages
5
Hi everyone.

I have a 93 Johnson 200 (vj200sletc) on a 20' nitro bass boat. Here's the problem and I'm hoping that some of you might be able to help me out. What always happened was when I would get through a no wake zone and try to go WOT it would bog down then After a few seconds it would take off. Also whenever I tried to power load on the trailer 9 times out of 10 it would stall. I figured that there was a problem with the carbs since they leaked a little, so I rebuilt all 6 to the Johnson manual specs. I also installed a new vro2 pump since it also leaked a little. After doing that my vacuum switch started spraying gas so I replaced that as well and it got a new fuel filter too. So after doing all of that I took the boat out and to my surprise it was harder to get on plane than before top end worked great. Also at the ramp I always beach the boat and use the motor to back off but this time it kept stalling on me which it never use to do. It also would not power load. The only thing I noticed was the primer bulb had become soft. So I replaced that with a johnson one thinking maybe it was faulty and was letting air in. I took the boat out this past weekend and it acted up even worse than before. This time every time I tried to put it in gear and give it just a little throttle it would stall. It would continue to do this for a few starts then it worked fine until I shut it off again. I have checked the timing and everything seems fine. A few of the spark plugs were a little black so I got some more but haven't put them in yet. I also checked for spark on all cylinders and they look good. Also compression is between 96-100 on all cylinders. I just don't understand how it's worse now than it was before I did all the work. I have also done the whole link and sync process last year i didnt do it after the carb rebuilds because I never removed the throttle bodies. I will recheck that. All these parts are omc. Last year a also replaced the stator. If some could help me solve this mystery I would greatly appreciate it.
 

ranger1850v

Cadet
Joined
Jul 29, 2012
Messages
22
Re: 93 Johnson 200 gt stalls under load

I have a 87 gt 200 and it does the same thing. I have vro eliminated n mix it in the tank. Checked everything from the shift assist to power pack. Has a new stator and reg on it. Rebuilt my carbs to spec. Timer base advances as should. Comp is low tho (70s). My difference I guess is that mine misses n stumbles around 2k n won't plane. Sometimes stalls. But I've done everything like you have and can't seem to point it out. Ha. I did notice some white smoke out of mine tho. Prolly water
 

RDenno

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Joined
Jul 30, 2012
Messages
5
Re: 93 Johnson 200 gt stalls under load

The only smoke that I get is at startup but I believe it's just the oil because it goes away after a few minutes. I was doing a little research and I might have created part of this problem, when I rebuilt my carbs I followed the specs but I think I screwed one thing up. The kit came with the needle seat gasket which I installed not realizing that I didn't need it. I'm not sure if that throws the needle off enough to be causing my problem but I will take them all apart again and find out. I'm thinking it might have and that's why it's worse than it was before the rebuild hopefully I will be able to get it back together and try it this weekend.
 

ranger1850v

Cadet
Joined
Jul 29, 2012
Messages
22
Re: 93 Johnson 200 gt stalls under load

I wouldn't think new seats would hurt but that's me. Have u tried choking the engine when it starts to bogg n stall? Or maybe take the cover off?
 

RDenno

Recruit
Joined
Jul 30, 2012
Messages
5
Re: 93 Johnson 200 gt stalls under load

I don't believe it's the seats that are causing the problem but possibly the gaskets that I put on when they weren't required. I'm thinking that the gaskets are raising the seats up higher than they should be which is causing the needle to stop fuel too soon. That is just a thought I don't know for sure. No I haven't tried to choke it yet or remove the cover. I'm thinking that it's something I must have done since things are worse now than they were but I don't know what went wrong. I will try choking it just to see the next time I'm out. I still think I'm going to remove the seat gaskets anyway just to know for sure.
 
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