200 HPDI Yamaha Two Stroke Gas

[pressure23]

Hi all, I have an old 1994 Grady White 209 Escape. You can say it's old and not that big, but man do I love the boat. So much free space and rides great. I have a 200 Yamaha HPDI two stroke. I know it's an old engine and not the most environmentally friendly but again I love it. Very fast out of the hole and reliable and not as heavy as a four stroke which I know one day I may have to move to. As I'm thinking of my time on water this year, I'm wondering about bringing on gas station gas for days I don't want to go to busy marina gas dock in Sandy Hook area. Does anyone know if a two-stroke can handle regular gasoline gas. I know more than 10% ethanol is no good, but was wondering if 2-stroke more forgiving with gasoline gas or less. Any insight would be appreciated!

 

[Mustang65fbk]

I have a different boat and motor, but I always use ethanol free gasoline for my boat and, knock on wood, I've yet to have any issues with it. I believe you can do a Google search for gas stations with ethanol free fuel at them, which is what I'd recommend using.

 

[seasick]

That motor may need 87 octane and regular at the pump is near 84. I am pretty sure that motor does not have a knock sensor that can help compensate for lower octane. Engine knock can destroy a motor quickly. If you hear knocking under load, reduce the load and add higher octane gas to the tank
Marine formulated gas may have additives specifically geared towards marine engines. Products like Valvtect are an example.
On the other end of the argument, assuming the octane rating matched the motor needs, after all these years, using gasoline without specific marine additives isn't going to make a big difference. You should in either case be adding a carbon cleaning additive like RingFree or equivalent.

 

[DennisG01]

Don't even give it a second thought. Regular 87 at the pump is fine. You're good. Change your thought process and think of it this way... It's exactly what trailer boaters do all the time (myself included) and also boaters in slips where access to on-water gas isn't available. I would suggest adding an additive like Startron, at the least... and ideally something like RingFree - but that's something I add regardless of where I get gas.

Fill 'er up and go boatin'!

 

[SkunkBoat]

If you are in a marina they are not going to be happy with you fueling from cans. Check your rules.


Same gas. Major brands of gas have the same additives equivalent to techron/ring free
Many marine fuel docks are 89 octane which is part of the reason they are so expensive.

There is no need to search for, and pay for non-ethanol fuel.
10% ethanol is fine. Its been around since 1978. Its been in every state since 2010.
It was a problem with old fuel hoses made before the standards were changed. it was a problem with fiberglass fuel tanks.
It can be a problem if you store it for many months/years.

Seasick, idk where you find 84 octane gas.. never seen that in my life. Regular is 87.

 

[seasick]

If you are in a marina they are not going to be happy with you fueling from cans. Check your rules.


Same gas. Major brands of gas have the same additives equivalent to techron/ring free
Many marine fuel docks are 89 octane which is part of the reason they are so expensive.

There is no need to search for, and pay for non-ethanol fuel.
10% ethanol is fine. Its been around since 1978. Its been in every state since 2010.
It was a problem with old fuel hoses made before the standards were changed. it was a problem with fiberglass fuel tanks.
It can be a problem if you store it for many months/years.

Seasick, idk where you find 84 octane gas.. never seen that in my life. Regular is 87.

I was in lala land. Actually the octane minimum ration for regular grade of gasoline is (pardon the pun) regulated by the state.
Most states have an 87 minimum requirement but several have 85 as the requirement.

To get 84 I store the gas for a few years in my garage