Mercury Motor

topwater33 · 03-20-06, 05:21 PM

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.

Jackl · 03-20-06, 06:49 PM

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.

JackL

bass kicker · 03-20-06, 10:19 PM

we use high octane in our boat because it seemed to run better with it

1FASTLASER · 03-21-06, 08:55 AM

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.

bass kicker · 03-23-06, 08:15 PM

we use the gold one lower then premium

bass kicker · 03-23-06, 08:15 PM

is that all right for the motor laser

1FASTLASER · 03-24-06, 07:15 AM

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.

bass kicker · 03-24-06, 08:48 PM

thanks alot laser i will tell my dad that

03-20-06, 05:21 PM	#1
topwater33 BassFishin.Com Member Join Date: Mar 2006 Posts: 4	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.

03-20-06, 06:49 PM	#2
Jackl BassFishin.Com Super Veteran Join Date: Jan 2002 Location: Great Bend, KS Posts: 2,960	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. JackL __________________ There are two theories about argueing with women...........Neither one works!

03-20-06, 10:19 PM	#3
bass kicker BassFishin.Com Super Veteran Join Date: Oct 2005 Location: Beamsville,ONTARIO,CANADA Posts: 2,023	we use high octane in our boat because it seemed to run better with it __________________ Rob Downs St. Catharines BASSMASTERS

03-21-06, 08:55 AM	#4
1FASTLASER BassFishin.Com Super Veteran Join Date: Aug 2005 Location: crossett,arkansas Posts: 2,777	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. __________________ Laser's rule with Merc's doing the pushing..........KEEP THE WETSIDE DOWN AND THE DRY SIDE UP!!!!!!

03-23-06, 08:15 PM	#5
bass kicker BassFishin.Com Super Veteran Join Date: Oct 2005 Location: Beamsville,ONTARIO,CANADA Posts: 2,023	we use the gold one lower then premium __________________ Rob Downs St. Catharines BASSMASTERS

03-23-06, 08:15 PM	#6
bass kicker BassFishin.Com Super Veteran Join Date: Oct 2005 Location: Beamsville,ONTARIO,CANADA Posts: 2,023	is that all right for the motor laser __________________ Rob Downs St. Catharines BASSMASTERS

03-24-06, 08:48 PM	#8
bass kicker BassFishin.Com Super Veteran Join Date: Oct 2005 Location: Beamsville,ONTARIO,CANADA Posts: 2,023	thanks alot laser i will tell my dad that __________________ Rob Downs St. Catharines BASSMASTERS

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