Stumped!!

[CDEAN1469]

So heres the story i have been working on a 1988 25 hp johnson for a little while now trying to get it running right but so far have not been sucessful after reading and writing posts here i found out that i needed to do a link and sync which i used the manual for i also used joe reeves wot timming procedure to do the timming part after doing these things i felt for sure it would right so i took it to the lake and it started alot easier but still will not run wide open it will almost then right before you get there it bogs down im totally stumped i thought all i did to it that it would fix it but once again i went on a work on the motor trip instead of a fishing trip some one please give me a direction some ideas on what else i can try or something please thanks alot CD

 

[gatorhead]

Re: Stumped!!

I know its not what you want to hear but from my experience it sounds like the carb still. It will run and idle fine with the muffs on, but when you place it under load in the water it will bog down.

I use an acid to clean the carbs with and I also have a cleaning key, looks like an allen set but just stiff wires. I clean the passages up as best I can with brushes and the keys then I let soak in acid for 15-20 minutes and repeat the process again. They sell the carb acid at Advanced or the like and it runs @ $15 for the 1/2 gallon can.

 

[daselbee]

Re: Stumped!!

Running out of gas. Weak fuel pump cannot keep up with the volume requirements at WOT, but can at idle.
Try pumping the primer bulb and take it up to WOT.
If it runs OK while pumping the bulb, weak fuel pump.

 

[CDEAN1469]

Re: Stumped!!

ive checked that it doesnt make a difference but what about this when it is running good the fuel in the carb is spraying more of a mist in the motor but when it starts to bog the fuel changes to what seems to be more fuel than normal and doesnt look like a mist but a lot thicker what could cause this that seems to be the problem

 

[69starcraft]

Re: Stumped!!

When you cleaned the carbs did you actually fully disassemble them?

Sounds like a clogged jet to me.

I can't tell you how many times I've cleaned carbs only to have dislodged a small particle that makes its way back in to my nice "clean" carb lol

If your timing is set right, and the above fuel pump test doesn't help, then I would go back to carbs

Also check the obvious and make sure advance linkage is hooked up (different motor and BTDT lol)

 

[jonesg]

Re: Stumped!!

final adjustments are supposed to be made on the water, it sounds like timing is still slightly off, the fuel spray isn't being atomized at wot because the carb is losing its vacuum, hence the fuel spray looking like it does at wot.
I'd look at adjusting the advance at wot to tweak it.
Take another look at Joes directions.

 

[CDEAN1469]

Re: Stumped!!

i adjusted it -4 degrees of what it calls for /adjust the advance at wot what exactly do you mean by that / the throttle control arm or what

 

[CDEAN1469]

Re: Stumped!!

Yes i have cleaned and cleaned and cleaned and rebuilt and cleaned the carb some more doesnt seem to help

 

[CDEAN1469]

Re: Stumped!!

are you saying that i should reset the timming all over again when you do a link and sync should you set the timming before or after you set the carb and throttle control arm

 

[jonesg]

Re: Stumped!!

re-read Joe directions,
initial timing is set static,
but it also has to be set dynamically (on the water ) ,
the initial setting is just ballpark.
I think your carb is fine.