under powered mercury 125 / 2 stroke

R

REEL WORK

Cadet
Joined
Jun 4, 2022
Messages
9
Hi there

I'm hoping someone could help me out with an issue i'm having with my motor ,
i have replaced the following parts , spark plugs , new leads , CDI box , coil packs x 4 , starter motor , propeller from 17 pitch to 19 pitch , fuel filters x 2 , water seperator filter , fuel line with primer bulb , tune up , compression is at 130 on all cylinders

the problem i had was it appeared to be taking in too much air & bogging down when going into full throttle , after replacing all of the above it appears to be much better but i can't get passed 27.5 knots on flat water , i'm really at a loss as to why this is happening & hoping someone could give me an idea or recommend what the fault could be


regards

Ron
 
flyingscott

flyingscott

Fleet Admiral
Joined
Apr 8, 2014
Messages
8,240
How long have you owned this motor? Did this happen recently? Do you have a factory manual? Were the carbs removed recently? Link and sync done correctly? Accelerator pumps working? Factory manual is a must have for this motor
 
R

REEL WORK

Cadet
Joined
Jun 4, 2022
Messages
9
flyingscott said:
How long have you owned this motor? Did this happen recently? Do you have a factory manual? Were the carbs removed recently? Link and sync done correctly? Accelerator pumps working? Factory manual is a must have for this motor
Click to expand...
thank you for your feed back , i have this motor about 12 months now as my old one died & got this 2nd hand complete with svc history which was done before i got it & compression checked , as for the carbs being removed i really cant say as i havent removed them but unsure with previous owner , the main concern is trying to get it up to full throttle as it makes noise but doesn't go any faster , like it's bogging down , i should be getting more power out of it but 27.5 knots is all it does
 
flyingscott

flyingscott

Fleet Admiral
Joined
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Messages
8,240
REEL WORK said:
thank you for your feed back , i have this motor about 12 months now as my old one died & got this 2nd hand complete with svc history which was done before i got it & compression checked , as for the carbs being removed i really cant say as i havent removed them but unsure with previous owner , the main concern is trying to get it up to full throttle as it makes noise but doesn't go any faster , like it's bogging down , i should be getting more power out of it but 27.5 knots is all it does
Click to expand...
That is a 2+2 motor so it idles on the top two until 1800 rpm then the bottom 2 cylinders come in. Need a factory manual to set this motor up correctly.
 
flyingscott

flyingscott

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Well your 19" pitch is nor helping matters. Do you have your manual yet? What yr is your motor? If an early one classic signs of high speed windings failing.
 
R

REEL WORK

Cadet
Joined
Jun 4, 2022
Messages
9
flyingscott said:
Well your 19" pitch is nor helping matters. Do you have your manual yet? What yr is your motor? If an early one classic signs of high speed windings failing.
Click to expand...
okay so if i replace th 19 inch pitch with a 17 inch one would that be better & no i don't have a manual for it yet , it is a 1996 125 2 stroke of shore long shaft , how do i fix the high speed windings ????
 
flyingscott

flyingscott

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Joined
Apr 8, 2014
Messages
8,240
REEL WORK said:
okay so if i replace th 19 inch pitch with a 17 inch one would that be better & no i don't have a manual for it yet , it is a 1996 125 2 stroke of shore long shaft , how do i fix the high speed windings ????
Click to expand...
If you get the manual you can do the tests. You need the manual!!!
 
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