Wisconsin — Carburetor Reassembly and Float Setting
Repair & overhaul · Zenith Model 87A8 carburetor
From a Wisconsin service manual covering: FM-X4B7D, V-460D, V-461D, V-465D, V460D, V461D, V465, Y-128-S1, YB-85A. Check it applies to your exact model before use.
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Before you start
- Do not bend, twist, or apply pressure on the float body.
- Replace all gaskets, throttle shaft seal and retainer each time carburetor is overhauled.
Procedure
- Install fuel valve seat and fibre washer using Zenith Tool No. C161-85.
- Install main discharge jet using a small screwdriver.
- Install fuel valve needle in seat, followed by float and float axle.
- Check float setting with bowl cover inverted: 31/32 in. plus or minus 1/32 in. from machined surface to top of float body.
- Bend float lever close to float body with long nosed pliers if off; replace float if off more than 1/16 in.
- Install throttle body to fuel bowl gasket.
- Install idle adjusting needle and spring; screw in until it seats lightly then back out 1 1/2 turns.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Float setting 31/32 in. plus or minus 1/32 in.
- Idle adjusting needle preliminary setting 1 1/2 turns out
Source: Wisconsin service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.