Logo
FULL SITE MENU

Hard starting 99 Mercury

B

boatn4fun

Member
"I have a 1998, 9.9 Mercury th

"I have a 1998, 9.9 Mercury that is very hard to start all the time. It has new plugs with good spark and is getting fuel. The top clylinder is getting the plug wet and the bottom dry. It takes a few tries once it fires to get it going, almost like it not getting enough fuel. It usually takes between 50-100 pulls to get it started.
Please help before I throw it over board!"
 
"Need to do some research: Fil

"Need to do some research: Fill a spray bottle with pre-mixed gas and give it a shot (cold motor). If it fires up fairly easily, the carb needs a rebuild. If not, start looking at ignition components (like an intermittent spark box).

Jeff"
 
Do as FJ said.

Than fin

Do as FJ said.

Than find the warm up rod that runs from the pull/twist knob linkage to the spark arm (trigger) under the flywheel and make sure the L end of the rod is pointing up and grabbing the trigger and moving it to advance the timing. Set that fast idle adjustment to ~1500RPM with the know screwed in.
 
Thankyou so very much!. It was

Thankyou so very much!. It was the warm up rod. It was on upside down from the previous owner. I have been pulling that motor like that for two years now and had finally had enough. You think I would have asked for help sooner. Any hints on how to tune it for the best performance. Now that it starts (thanks again)
 
Back
Top