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Can the GCV190 carb be installed in place of the GCV160 carb?
There would be no need to swap carburetors. Just swap jet sizes.

You can gain a little power with a fatter main jet, but you can't go more than a few sizes up without messing up the stoichiometry. Honda jets are numbered by the aperture diameter in hundredths of a mm. So for an example, a GCV160 #62 jet is part 99101-124-0620 = 0.620mm = 0.0244"
 

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I don't know if bowls running dry is really a problem...
Not going to happen...
should I also increase the pilot jet size an equal amount?
You could go up to the next listed size, if needed. The pilot jet is always providing fuel, and then the main jet adds on top of it as RPM increases. Think of your engine as an air pump. The throttle plate opens to allow additional air to be pumped, and the venturi creates vacuum that draws fuel through the jets (where the jets' venturis cause it to atomize), hopefully somewhere near 14.7:1.
 
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The Honda website has the net power listed at 3600rpms, which is well above where they wish people to operate these machines... 3000rpms is the recommended operating speed to reduce warranty claims and maintain a reputation of reliability.
On a Honda mower with the GCV160, the maximum safe RPM is 3,100.
ENGINE
Model GCV160
Engine type 4-stroke, overhead-cam, single-cylinder, air-cooled
Displacement 9.8 cu in (160 cc)
Bore and stroke 2.52 x 1.97 in (64 x 50 mm)
Compression ratio 8.5:1
Ignition system Transistorized magneto
Maximum horsepower 5.5 bhp (4.1 kW) @ 3,600 rpm
Maximum torque 8.4 ft-lb (11.4 N•m) @ 2,500 rpm
MAINTENANCE
Fuel Unleaded gasoline with a pump octane rating of 86 or higher
Engine oil SAE 10W-30
Spark plug type
Regular:NGK - BP6ES
DENSO - W20EP-U
Resistor:NGK - BPR6ES
DENSO - W20EPR-U
Maximum governed speed2,950 ~ 3,100 rpm
Blade bolt torque 36 ~ 43 ft-lb (5.0 ~ 6.0 kg-m, 49 ~ 59 N•m)
 

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But how are they [main nozzles] measured/labeled?

How does one determine which nozzle to choose? Is there a rule of thumb for emulsion tubes... like less holes for more rpms, or whatever?
The nozzle listed for the GCV160 in the mower application is: 16166-ZM0-003
 

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16166-Z8B-901 is what shows up for the GCV160LA1
Is that your exact GCV160 model? There are many GCV160 models, you know...
  • GCV160 (Type A1A)(VIN# GJAE-1000001-9999999)
  • GCV160 (Type A2A)(VIN# GJAE-1000001-9999999)
  • GCV160 (Type A2R)(VIN# GJAE-1000001-9999999)
  • GCV160 (Type N1)(VIN# GJAE-1000001-9999999)
  • GCV160 (Type N2)(VIN# GJAE-1000001-9999999)
  • GCV160 (Type N7A1)(VIN# GJAE-1000001-9999999)
  • GCV160A (Type A1A)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type A1AE)(VIN# GJAEA-1000001)
  • GCV160A (Type A1AF)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type A1AS)(VIN# GJAEA-1000001)
  • GCV160A (Type A2A)(VIN# GJAEA-1000001-6699999)
  • GCV160A (Type A2R)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type A3A)(VIN# GJAEA-1000001-6699999)
  • GCV160A (Type BHH)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type E1A2)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type E1A4)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type E1G7)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type E5A4)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type EHHB)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type N1A)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type N1AF)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type N5A)(VIN# GJAEA-1000001)
  • GCV160A (Type N5AF)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type N5MF)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type N5R)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type N7A1)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type NBL1)(VIN# GJAEA-1000001)
  • GCV160A (Type R1A)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type R3A)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type R3A1)(VIN# GJAEA-8000001-8018819)
  • GCV160A (Type RTL1)(VIN# GJAEA-1000001)
  • GCV160A (Type S1A)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type S1A1)(VIN# GJAEA-1000001-6699999)
  • GCV160A (Type S1M)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type S3A)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type S3A2)(VIN# GJAEA-1000001)
  • GCV160A (Type S3H)(VIN# GJAEA-1000001-5386302)
  • GCV160A (Type STA1)(VIN# GJAEA-1000001-6699999)
  • GCV160A (Type STL1)(VIN# GJAEA-1000001)
  • GCV160LA (Type A1A)(VIN# GJAEA-5386303)
  • GCV160LA (Type A1AF)(VIN# GJAEA-5386303)
  • GCV160LA (Type A2R)(VIN# GJAEA-5386303)
  • GCV160LA (Type E1A2)(VIN# GJAEA-8018820)
  • GCV160LA (Type N1AF)(VIN# GJAEA-5386303)
  • GCV160LA (Type BHH)(VIN# GJAEA-5386303)
  • GCV160LA (Type E1A2)(VIN# GJAEA-8018820)
  • GCV160LA (Type E1A2)(VIN# GJAEA-8018820)
  • GCV160LA (Type N1A)(VIN# GJAEA-5386303)
  • GCV160LA (Type N1AF)(VIN# GJAEA-5386303)
  • GCV160LA (Type N1AF)(VIN# GJAEA-5386303)
  • GCV160LA (Type N5AF)(VIN# GJAEA-5386303)
  • GCV160LA (Type N5AF)(VIN# GJAEA-5386303)
  • GCV160LA (Type N5MF)(VIN# GJAEA-5386303)
  • GCV160LA (Type N5MF)(VIN# GJAEA-5386303)
  • GCV160LA (Type N5R)(VIN# GJAEA-5386303)
  • GCV160LA (Type N5R)(VIN# GJAEA-5386303)
  • GCV160LA (Type N7A1)(VIN# GJAEA-5386303)
  • GCV160LA (Type N7A1)(VIN# GJAEA-5386303)
  • GCV160LA (Type N7S1)(VIN# GJAEA-5386303)
  • GCV160LA (Type N7S1)(VIN# GJAEA-5386303)
  • GCV160LA (Type R3A)(VIN# GJAEA-8018820)
  • GCV160LA (Type R3A)(VIN# GJAEA-8018820)
  • GCV160LA (Type S1A)(VIN# GJAEA-5386303)
  • GCV160LA (Type S1A)(VIN# GJAEA-5386303)
  • GCV160LA (Type S1M)(VIN# GJAEA-5386303)
  • GCV160LA (Type S1M)(VIN# GJAEA-5386303)
  • GCV160LA (Type S3A)(VIN# GJAEA-5386303)
  • GCV160LA (Type S3A)(VIN# GJAEA-5386303)
  • GCV160LA (Type S3H)(VIN# GJAEA-5386303)
  • GCV160LA (Type S3H)(VIN# GJAEA-5386303)
  • GCV160LA0 (Type A1A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type A1A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type A1AF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type A1AF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type A2R)(VIN# GJARA-1000001)
  • GCV160LA0 (Type A2R)(VIN# GJARA-1000001)
  • GCV160LA0 (Type BHH)(VIN# GJARA-1000001)
  • GCV160LA0 (Type BHH)(VIN# GJARA-1000001)
  • GCV160LA0 (Type E1A2)(VIN# GJARA-1000001)
  • GCV160LA0 (Type E1A2)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N1A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N1A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N1AF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N1AF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5AF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5AF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5MF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5MF)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5R)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5R)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5RB)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N5RB)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N7A1)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N7A1)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N7S1)(VIN# GJARA-1000001)
  • GCV160LA0 (Type N7S1)(VIN# GJARA-1000001)
  • GCV160LA0 (Type R3A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type R3A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S1A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S1A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S1M)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S1M)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S3A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S3A)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S3H)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S3H)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S3T)(VIN# GJARA-1000001)
  • GCV160LA0 (Type S3T)(VIN# GJARA-1000001)
  • GCV160LA0 (Type SBT)(VIN# GJARA-1000001)
  • GCV160LA0 (Type SBT)(VIN# GJARA-1000001)
  • GCV160LE (Type A2A9)(VIN# GJAAE-1000001)
  • GCV160LE (Type A2A9)(VIN# GJAAE-1000001)
  • GCV160LE (Type A4A9)(VIN# GJAAE-1000001)
  • GCV160LE (Type A4A9)(VIN# GJAAE-1000001)
  • GCV160LE (Type A7H1)(VIN# GJAAE-1000001)
  • GCV160LE (Type A7H1)(VIN# GJAAE-1000001)
  • GCV160LE (Type N7A1)(VIN# GJAAE-1000001)
  • GCV160LE (Type N7A1)(VIN# GJAAE-1000001)
 
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