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Author Topic:   96 75hp merc
scottfarm1 posted 11-24-2000 07:34 AM ET (US)   Profile for scottfarm1   Send Email to scottfarm1  
I changed the gear lube in the foot and noticed there was a neopreme washer on the top screw but not on the bottom. Shouldn't there be one there too. Didn't notice any water in foot. And also how much does this motor weigh. Is it the same block as the 90 mercury and if it is what's the difference. It also has a tendency to spit and cut off at idle--changed the plugs--did better but stills spits some--what could it be
Clark Roberts posted 11-24-2000 08:42 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Scott, your motor weighs about 304lbs and yes, there should be a washer on lower screw! The idle sputter can be eliminated by adjusting the 3 idle/air screws... start with 1 1/2 turns out and adjust plus or minus 1/2 turn... consult manual... easy to do and it will idle like a kitten... happy Whalin, Clark... spruce creek navy
Outraged posted 11-24-2000 09:35 AM ET (US)     Profile for Outraged  Send Email to Outraged     
Scott, I would check the hole the screw came out of to make sure the washer isn`t still there on the motor. I know this has happened to me before when I change the lower unit oil. As far as smoothing out the running of the motor, you might try running some "Ring- Free with your gas. This is a concentrated additive made by Yamaha to prevent carbon build-up.Follow the directions on the bottle and you should notice improvement. Outraged
FISHNFF posted 11-26-2000 12:18 AM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
Yes, Ring Free by YAMAHA( I believe it is a concentrated form of Techroline by Chevron) will help with the coughing and extend the motors life. The difference between the 75 and 90 is carb jets and I think valves and exhaust manifold. The RPM on the 90 is rated higher. I will try the air adjust screws to smooth mine out, but everyone I know who owns a 75 or 90 Merc 3 cylinder as the same rough idle.

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