Hi!
Usually it is just the jet in the carb that needs changing in most High Altitude kits. To change this remove the carb bowl at the bottom. Remove the float and float needle (be sure if there is a spring not to loose it!) Then the jet will be visible where the float needle was sitting. Remove and replace with your new jet.
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Parts Spares for Generators and Small Engine Machinery
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SOURCE: installing high altitude kit on Cozy NG furnace
the orifice that comes with the unit has a starter hole only needs to be drilled out, in the instructions is a chart for altitude de-rating.
SOURCE: what do you need to do to prepare a Honda 3000i handi generator for high altitude operation
The manual states no changes needed until over 5000ft. If needed take to honda service center for modification... blah, blah, blah. Not sure what "modification" they do other than replace the limited adjust (thanks "CARB") air fuel with adjustable, but as memory serves it's not that simple... if you break away the limited adjust the needle wont stay where set (thanks again "CARB").
Probably the easiest and least expensive for a DIY is order an adjustable replacement carburetor off ebay (~$15 US delivered).
Fig. Fig. 49: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission
Fig. Fig. 50: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission alternate
Fig. Fig. 51: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission
Fig. Fig. 52: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission alternate
Fig. Fig. 53: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with manual transmission
Fig. Fig. 54: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with manual transmission alternate
Fig. Fig. 55: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with manual transmission
Fig. Fig. 56: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with manual transmission alternate
Fig. Fig. 57: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with manual transmission alternate
Fig. Fig. 58: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission alternate
Fig. Fig. 59: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission alternate
Fig. Fig. 60: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission alternate
Fig. Fig. 61: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission alternate
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