Generac — LP Carburetor Load Adjustment
Adjustments · IMPCO CA50-506 carburetor
From a Generac service manual covering: IM100G, IM80G, NP100G, NP80G. Check it applies to your exact model before use.
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Procedure
- Connect an AC frequency meter to the generator's AC power output leads.
- Disconnect all electrical loads (set main circuit breaker to Off or Open).
- Turn the load adjustment as far as it will go toward the R (maximum rich).
- Start the engine, let it stabilize and warm up at no-load.
- Apply an electrical load equal to the generator's rated maximum continuous wattage/amperage capacity.
- Slowly turn the load adjustment toward L (leaner) until engine starts to run rough and frequency starts to decrease.
- Slowly turn the load adjustment back toward R (richer) until engine starts to run rough and frequency starts to decrease.
- Turn the load adjustment toward L (leaner) until smooth operation and highest frequency is obtained.
- Turn off all electrical loads; no-load frequency should be 60.5-63.5 Hertz (60 Hz) or 49-52 Hertz (50 Hz).
Tools required
- AC frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- No-load frequency 60.5-63.5 Hertz (60 Hz units); 49-52 Hertz (50 Hz units)
Source: Generac 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.