HD-25 float replacement

[jimbrizzolara]

The carb float in HD-25 is shot. I could make a new one out of cork, but the dope to seal it would cost more than a Mercury plastic float, which I read can be used. On the Poche website he mentioned that the Merc float would have to be modified. Does anyone have experience with this?

[crosbyman]

folks here will tell you they work fine but you need to drill a center hole for the pin and clip .. never done one myself but if the Merc float is the same diam. no reason not to work

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[Mumbles]

The Merc floats work great and I have installed several in my TN motors. The small spring in them has to be removed and then I drilled them out to get a friction fit on the needle. With a friction fit, the float level can be easily adjusted.

[aquasonic]

It’s been a while since I worked on an HD, but isn’t the HD float a smaller diameter than the TD/TN float?

[jimbrizzolara]

I think you’re right. The Merc part number I have for the float is a different number than the one in the picture. Thanks for the replies.

[aquasonic]

I’m thinking that the TD/TN float is 1 1/8″ diameter, and the HD float is 1″ diameter, but not exactly sure. Is there one Mercury float for the “T” series, and a different one for the “H” series?

[crosbyman]

are those floats solid core ?? or empty

if solid maybe you can spin it down to 1” over sand paper ??

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• This reply was modified 3 years, 8 months ago by crosbyman.
• This reply was modified 3 years, 8 months ago by crosbyman.

[Mumbles]

Whoops, didn’t even think about the different OD’s. The part number shown in my earlier photo is the current P/N for the one in this older photo.

[lloyd]

TD/TN floats are 1 3/16 diameter and 1″ tall. HD float is 1 1/16 diameter and 3/4″ tall. I would make one from cork and seal it with old time acetate dope, but whatever makes you happy and floats your cork.

[jimbrizzolara]

I found a large cork, Superglued it to a large screw head, and sanded the cork to size in my drill press. I sealed the cork with Seal-All, which in my experience is very fuelproof. Thanks for all of the assistance, I’ll hopefully try out the motor today.

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