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Old 10-08-2022, 12:37   #1
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Join Date: Oct 2019
Location: Kennebunk ME
Boat: Owner built 60í Aluminum Expedition Yacht.
Posts: 1,854
Yamaha 2.5 hp Fuel Filter Alternative

Yamaha 2.5 hp 4 stroke has an in tank fuel filter (6L5-24251-00) which fits inside the fuel line under the tank. Itís ridiculously small and fragile to boot.
Somewhere I read that a larger fuel filter could be fit inline but I lost the reference. Anyone actually fit something better in that small space? There are some tiny disposable filters I could use, but maybe someone has a better idea.
Thank you in advance if you have a good solution.
And No, the manatee crew didnít buy this motor to mix drinks. Itís for my Trinka 12 which Iím selling and I want to have a reliable motor on it.
Captain Mark
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Old 20-08-2022, 10:52   #2
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Join Date: Oct 2019
Location: Kennebunk ME
Boat: Owner built 60í Aluminum Expedition Yacht.
Posts: 1,854
Re: Yamaha 2.5 hp Fuel Filter Alternative

Well just in case someone has a problem with this popular dinghy motor, here is what we did...might not help...but so far itís good.
The fuel line is 1/4Ē except where it exits the tank. Youíll need to save the 90 degree molded section. We removed the existing filter and bought an automotive one about 1&1/2Ē long by 3/4Ē wide. Clear plastic, 1/4Ē both ends. We added a 1/4 x 1/4 barb to barb connector and less than 1 foot of clear hose. So from the tank. Molded hose turned toward the spark plug and cut about 2Ē from the end.
Barb connector into the molded fuel line. Clear line to the filter then clear line to the carb. We used the space above the spark plug to fit the filter so there is much more fuel line but you have a decent filter.
We are using Startron Enzyme Fuel Treatment ( blue bottle in most auto stores).
Cleaned the carb twice and put new gaskets on with TefGel to hold them in place.
Put the two screws into the air filter then the carb...then the gaskets and spacer then tilt all this toward the engine and do the hoses last with hemostats. Dab TefGel on the throttle cable. The adjustment screw should be half way between stalling rich or lean or about half way in or out. Donít force it in or youíll need a new carb. Filter all your gas and chuck it if itís old. Ethanol free obviously.
Always bring oars, water and a plastic bag raincoat.
I hate carb outboards. I hate carb outboards. I hate carb outboards.
Mark
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