Outboard Motor Repair Outboard Motor Repair  

Outboard Motors

Power Heads

Lower Units

Props

Repair Manuals

Controls, Steering

Trim/Tilt

Power Tilt/Trim

Parts

Outboard Motor Repair


Chrysler
Evinrude
Force
Honda
Johnson
Mariner
Mercury
Minn Kota
Nissan
OMC
Suzuki
Yamaha
2 Cycle Outboard Motors
2 Stroke Outboards
4 Cycle Outboards
4 Stroke Outboards
Aftermarket Outboard Parts
Boat Wont Plane
Bolts
Brackets
Carburetors
Cavitation
Choke
Coils
Compression
Condensors
Controls
Cooling
Cowling
Crankshafts
Cylinders
Diagrams
EFI
Electrical
Engine Cleaner
Engine Smoke
Exhaust
FICHT
Fins
Flywheel
Fouling
Fuel Pumps
Fuel Systems
Fuel Tanks
Gaskets
Gauges
Gear Cases
Generators
I/O
Idle
Ignition
Impellers
Inverters
Kill Switch
Leaks
Lower Units
Lubrication
Manuals
Oil
Oil Injection
Oil Mixture
Old Outboards
Outboard Engine Blocks
Outboard Inboard
Outboard Maintenance
Outboard Motor Prices
Outboard Propellers
Paint
Parts
Pistons
Power Loss
Power Packs
Powerheads
Primer Bulb
RPM
Repair Tools
Reverse
Running Lean
Running Rich
Runs Hot
Sea Drives
Sealants
Shafts
Shifter
Skegs
Spark Plugs
Specs
Spring Maintenance
Starter Motors
Starting Problems
Stators
Steering
Synthetic Oil
Tachometers
Tillers
Tilt Trim
Timing
Trim Tabs
Twin Outboards
V6
Voltmeter
Water Pumps
Winterization
Wiring
Year

WOT Sputter

Makko I have a 1985 50hp Johnson it runs great until I run it at full open, then I can hear it sputter a little. If I back off just a little it runs normal. Any ideas as to what could be the cause of this? [Eek!] 2002-04-09
snuffyzz air to fuel ratio, try adjusting the jet. 2002-04-09
petryshyn To eliminate a fuel pressure issue, try squeezing the primer ball when its sputtering. If it cures it, its a fuel supply problem (restriction in tank, hose, filter, fuel pump issue etc.)....The main jets could also be partially plugged. Try engaging the primer when the sputtering occurs. If that cures it briefly, its a fuel starvation issue.
If the above doesn't affect it,I would go through the synch and maximum timing adjustments as well....
2002-04-09
Makko [Big Grin] Thanks, Snuffyzz and Schematic!!!
I will try the squeezing the primer ball when it sputters.I have located the original owners manual that came with the motor, its a little mol
2002-04-09
petryshyn Hi Makko

do you have a tach on board? If so, what RPM does it go up to before misfire?
2002-04-09
G DANE Hi Makko

I just mailed you

Which boat is this motor on, and which propeller do you have. Maybe that is the problem.

Dane
2002-04-09
Kuni start with the basics first before ripping into it you could just have a ht lead breaking down or a bad plug,although rev limiters will give the symptoms you describe and no they aren't settable but on some engines you can cut the wire for racing purposes but i wouldn't recommend doing it. 2002-04-10
Makko No tach on board at this time..I plan to put one on in the next few days. I took it out for a test run yesterday (and some fishing) I could give it full throttle until it got up to speed then it started sputtering. I think it must be the limiter. I do need a tach so I can check the RPM at WOT/full speed. I will scan the manual tonight and sent it out. Thanks all
for your help
2002-04-11
petryshyn Don't get carried away troubleshooting until you check the RPM.... 2002-04-11

If you would like to post your own question for the experts just click on
the Boating Forums tab at the top of the page or click here!

Disclaimer: iboats.com provides this content for the education and benefit of all boating enthusiasts.
We cannot, however, take responsibility for individual postings, nor can we verify the accuracy of any posting.
Please use any information provided from individuals with great care and read any applicable manuals or safety instructions.
Also, if you determine that a posting is inaccurate or offensive in any manner, please use the Contact Us email form found below.

If you would like to post your own question for the experts just click on the Boating Forums tab at the top of the page!


Outboard Motors

Power Heads

Lower Units

Props

Repair Manuals

Controls, Steering

Trim/Tilt

Power Tilt/Trim

Parts

Outboard Repairs | Boats | Outboard Motors | Boat Dealers
Boat Covers | Boat Propellers | Boat Repair | Marine Engines | Outboard Forum Directory
Terms of Use | Privacy Practices | Legal Notices

1-800-869-1686 (Toll Free)
001-801-571-0071 (International Calls)
Copyright © 1999-2009 iboats, inc. All rights reserved.