Bogging/stalling issues

[kay]

I have a Merc 40 Thunderbolt that seems to have some issues...When i first took it out,it would start rite away but i could only go into trolling speed.If i gave it more throttle...it would die.But now...i`m having a hard time starting the motor.I`m thinking it needs to be tuned.Maybe running too rich?Also...when i opened her up, I found out some of the plastic from the choke had melted onto the carburator(see pic).Any reason what could of caused this? Looking at one of the pictures...theres a hose running on top of the carb( i think it`s coming from the float) that had a crack underneath.You guys think that had something to do with melting the plastic?Thanks!!!

 

[Laddies]

Re: Bogging/stalling issues

It looks like the engine may have backfired and started a carb fire, the backfire was probably caused by the lean condition that wouldn't let the engine run at full speed, you need the carb cleaned and the choke parts replaced

 

[kay]

Re: Bogging/stalling issues

Sorry for the late response or update. I took the carb apart and cleaned it. I found the problem of it bogging... I forgot to ground one of the wires for the ignition. I think thats why it was bogging. Started her up and did a little tuning with the muffs on and she works great now. I just need to get her into the water to tune her with load. I did check the compression and both cylinders are around 155psi each . I also replaced the hose that was on top of the carb as it was dry rotted. I think the melted plastic was a piece of the choke assembly. Not too bad as i think it was only $7 to replace it. Thanks for the suggestion...

 

[geb]

Re: Bogging/stalling issues

Sounds like you got it going fine. Not meaning to hijack thread, but the photo of the carb reminded me of a question. This is for the experts about the tubing that runs across the top, that's for some king of fuel conservation of some sort I think. I've read here about putting a bb to plug it. Is that a good recommendation to follow? And are there really any benefits to plugging it or not? Thanks

geb