2005 Merc 50hp Idle

[qwest]

Hi,

I recently purchased an 01' scout 162 w/ a 50hp merc 2 stroke (ELPTO) that seems to have some idle issues. I suspected dirty carbs/gas at first as the motor had sat for over 2 yrs. I then cleaned the carbs and ran an external tank but the motor continues to die at idle.

If I start it w/ a bit of throttle it will stay running, but as soon as I drop it to neutral it starts to fade out until it dies. Is there a good way of going about adjusting the idle stop screws and linkage? Anything I should look into before taking this step?

Model #1050412DD

Thanks in advance

 

[brodmann]

When some folks here say they "cleaned the carbs" it sometimes means they sprayed a little carb cleaner into the throat of the carb. I've included a diargram of your carb. Cover #10 has to come off and all the little passages in there need to be cleaned out and have compressed air forced throught them. If you don't have a compressor, carb cleaner with the little straw on it is the next best thing. I'd start with the mixture screw screwed all the way in and then 1-1/2 turns out. If you have a tach, at what point is it shutting off? The main jet starts kicking in at about 1,000 to 1,500 RPM's., so if it won't idle below 1,000 RPM's, its because there is a blockage in your idle circuit. That's up top under that cover.

 

[qwest]

thank you for the response,

It will only start when given a bit of throttle and choked. It will then continue to run as long as it stays above around 2000 rpms. I've let it run for a few minutes around 2-3k rpms and then drop back down to idle, but it immediately starts to fade out and die. I believe the motor is supposed to idle @ 650

I took all 3 carbs completely off along with the top plate and cleaned thoroughly (to my knowledge) but I can check again. Is there an idle mixture screw on each carburetor?