Cummins/Onan 4.0 BF-1R/9500 — Carburetor Float Adjustment
Adjustments
For the Cummins/Onan 4.0 BF-1R/9500, from the Cummins/Onan service manual.
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Before you start
- Do not bend the float when installed; may deform needle or seat.
Procedure
- Invert float and casting.
- With float resting lightly against needle and seat, clearance between float base and casting should be .07 to .11 inch.
- Use a 3/32 inch drill bit (or bit between .07 No. 50 and .11 No. 35) to measure.
- If resetting level, remove float and bend the float tang near the pin to obtain correct level.
Tools required
- 3/32 inch drill bit Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- .07 to .11 inch (3/32 inch clearance)
Source: Cummins/Onan 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.