My 50 Mercury outboard runs at 4200 rpms even with the prop out of the water when the owners manual says it should run 5500 rpms.
2007-07-19 11:04:00 · 6 answers · asked by Rusty 1 in Cars & Transportation ➔ Boats & Boating
Your muffler bearings are way out of wack. First you need to add water to the gasoline then pull the start cord as hard as you can. If that doesn't work I would suggest having a friend start while you are in the water and when the prop starts spinning help it with your hands to spin faster.
2007-07-19 11:14:47 · answer #1 · answered by Anonymous · 0⤊ 3⤋
Do not put water in your gas... I dont know what that guy was thinking.
Ok.. Its easy to really mess up the carbs .... My suggestion is that you take it to a dealer bite the bullet and let them do it.
The problem doing this at home is that with the muffs you are running you motor too high revs ... You will overheat the motor. Muffs are only good at idle speed.. and for flushing... they cannot push the water through fastenough for the motor to run at high speeds. Even putting the motor in a bucket can be problematic.
If you have the prop out of the water turning this is extremely bad.... the prop can run on and spin faster than it should causing damage to the motor... also some one could even you could get caught by the prop.
But if you must do it... get the Workshop manual for that particular merc... ( libairy is the best place.) and look up carb ajustments.... This will show ou the 4 ajustment screws... one is low idle one is fast idle the others i cant remember LOL.. I think its air to gas .. LOL.. But anyway ... get the manual and use that.
make the smallest ajustments you can each time... no half or quater turns of these screws ... just bearly move them ..
In reality though it may not just be the carb it may be that the engine need a full service and tune up... you may have a cylinder not firing too... so check the spark plugs.... ... your lower reves may be indicative of another problem rather than the carb...
2007-07-19 11:35:34 · answer #2 · answered by tony b 5 · 0⤊ 0⤋
Leave the carbs alone.......you need to adjust your throttle cable where it connects to the carb linkage or you need to get a different prop. changing diameter and pitch of your prop can change your RPM's. Making any adjustments to the carbs could also affect your timing so let the pro's do it. You may get lucky and figure it out with the proper service manual, but it can be tricky at times. Oh yeah....don't ever rev your engine to anything over 2000 RPM's unless the prop is in the water.....you will do some serious damage to either the engine or gearing in the lower unit.
2007-07-19 18:37:37 · answer #3 · answered by coasty_14 2 · 0⤊ 0⤋
#1 don't ever run your motor in gear out of the water. It will tear it up real fast.
#2 It is possible that you have a throttle stop that is stopping it from opening up. Adjust the cable for that.
#3 How does it run at 4200 rpms? If it runs good the carbs don't need adjusted. If it runs crappy, the best thing to do is find a big lake or river with light traffic and adjust them while the boat is in motion.
2007-07-20 00:53:12 · answer #4 · answered by Anonymous · 0⤊ 0⤋
If it's only turning 4200 rpm than either the tacks wrong or your proped wrong or the Eng is missing a beat.Don't know what your talking about out of the water.Unless you mean trimmed up??
2007-07-19 12:22:34 · answer #5 · answered by 45 auto 7 · 0⤊ 0⤋
you gotta' be brain-damaged to run an engine that tight with no load!
2007-07-20 02:02:25 · answer #6 · answered by Anonymous · 0⤊ 0⤋