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The motor will start and run. But under load the motor falls on its face. Also the motor will rev up fine in idel but under load it dies off.
This not my motor but it is close friend and he takes me fishing so I need to find some answers.
Any help would great?
Sounds like a fuel starvation problem. Check carbs, fuel lines and pump-up bulb. If it has had ethanol in it the linings of the fuel lines may be coming apart and plugging things up.
A test to determine if it is fuel or electrical, launch boat, try to take off as normal and when it boggs down push in the key to choke the engine, if it try's to go it's a fuel related problem, if it kills it , it is an electrical problem, possibly stator, which Merc has always had problems with. Try this and see what goes.
Tom
Does any know where I could find rebuilt or aftermarket Stater?
KS, you were given very good advice above. Is this built in tank or portable? Having same problems,with a boat I just picked up.. I replaced all fuel lines and filter . I did find alot of trash in lines.
trash was even in carbs .. removed screws at side of ec carb(near bottom) and flushed using spray carb cleaner, then back flushing by sweezing primer ball till fuel ran out of carbs freely.
CDI Electronics makes the best aftermarket parts out there. They even stock the stators that Mercury has service Bulletins on that require red stator and alot of wiring changes. I think you can buy direct from CDI, you will need the serial number when ordering parts.
Tom
Thanks Guys! I'll give these ideas a shot!
x 2 and pull fuel tank and put a small length of log chain in tank and slosh around with solvent and dump out.Quote:
Originally Posted by HeyCharlie
I don't know much about a mercury but I have a 60 HP Johnson and it did that a couple of years ago and it turned out to be a coil pac only 20+ bucks from iboats, marine engines and a couple of other places. You can take your plugs out and see if one of them looks like it's not firing right but it's hard to tell when it only does it under a load or at high speed.
I was told if the tach is tripping, skipping or acting weird that it was a stator problem. Is there any truth in that?Quote:
Originally Posted by Archerguy1
My friends Johnson V-4 90hp did that. Had the carbs rebuilt and the problem was solved. I guess the bowls warp with age causing a starvation problem.
Sir I have this happen alot at the shop. Have your carb cleaned by a mechanic first. there a valve in the top where the needle valve meets it. trash can not get out unless its disassembled. Plus if its the stator or magneto a simple volt meter will tell if its good while running. I've seen a many of them burn a wire out under the flywheel.