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Old 03-20-06, 05:21 PM   #1
topwater33
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Default Mercury Motor

I just purchased a used boat and it has a 200 hp mercury motor. I was told to use 93 % octane gas. Can anyone tell me if this octane rating is good or bad for this particular motor.
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Old 03-20-06, 06:49 PM   #2
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TOPWATER,
Unless the engine has been modified to increase compression, there is no reason to use 93 octane, 86 would do just fine. I would talk to the person you bought the boat from and ask why 93 octane. If it has been modified, I would find out by whom, and contact them to make sure it actually needs Hi-Test.

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Old 03-20-06, 10:19 PM   #3
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we use high octane in our boat because it seemed to run better with it
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Old 03-21-06, 08:55 AM   #4
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As Jackl said there is no need to use high octane gas unless the motor has been modified. In fact using high octane gas on a stock motor is dtrimental to the motor. High octane is what causes carbon build up in outboard motors and carbon build up can cause you all sorts of problems up to and including messing up a powerhead. It will cause rings to stick,build up on the valves be it reed valsves on 2 strokes or valves on a 4 stroke. The only motors that do require higher octane arnt available to everyone. They are the motors that come from the factory that are setup to race.
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Old 03-23-06, 08:15 PM   #5
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we use the gold one lower then premium
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Old 03-23-06, 08:15 PM   #6
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is that all right for the motor laser
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Old 03-24-06, 07:15 AM   #7
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Quote:
Originally Posted by bass kicker
is that all right for the motor laser
Only and I repeat buddy and you can take my word for it ONLY modified engines will need high octane fuel. Octane is what causes carbon build up inside motors and carbon build up leads to motor issues that could be very costly. Trust me your motor runs or will run just as good on 87 as it does on 92 or 93. Yes it may seem to run a little better, from the factory the timing may have been left a tad high which would cause this motor to run a little better. I dont recommend running high octane fuel in stock engines at ALL period. This comes from ALOT of experience turning wrenches on motors. Read your owners manul or contact a marine dealer near you and I am positive he will concur with me.
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Old 03-24-06, 08:48 PM   #8
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thanks alot laser i will tell my dad that
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