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Old 11-11-2019, 10:51   #1
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Boat: Hunter Legend 356 35' 6"
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Mariner Outboard 2.5 & 3.3 difference?



Hi,
I have a Mariner 2.5 hp 2 stroke outboard, and would like to upgrade it to the 3.3....the only difference I can find is the throttle valve in the parts breakdown (the carb' body would appear to be the same, so it can't be a different diameter).
However, I have just taken off the carb' to have a look at it and found a restrictor plate (not shown on any of the parts breakdowns I have found) between the carb' and the inlet spigot on the crankshaft base.
Anyone have any experience of removing this restrictor plate please?
I have yet to test the outboard on the dingy, so can't tell if there is any difference in hp.
Thanks,
Neil




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Old 16-11-2019, 10:02   #2
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Re: Mariner Outboard 2.5 & 3.3 difference?

Found this:



So it looks like removing the restrictor is the way ahead.....I have yet to check if the throttle slide goes all the way to the top....if I remember correctly it does.

Jets are the same.

Just awaiting a new fuel tank (thread has gone on the filler cap) to test it....oh, and a nice day of course!
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Old 16-11-2019, 10:44   #3
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Re: Mariner Outboard 2.5 & 3.3 difference?

Never seen a restrictor plate on those just the length of the plunger. Can probably cut it down carefully with a hacksaw
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